Prove It: The Art of Mathematical Argument

Course No. 1431
Professor Bruce H. Edwards, Ph.D.
University of Florida
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Course No. 1431
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Course Overview

Mathematical proof is the gold standard of knowledge. Once a mathematical statement has been proved with a rigorous argument, it counts as true throughout the universe and for all time. Imagine, then, the thrill of being able to prove something in mathematics. The experience is the closest you can get to glimpsing the abstract order behind all things.

Only by doing a proof can you reach the deep insights that mathematics offers—that tell you why something is true, not merely that it is true. Such insights are invaluable for getting a grasp of the key concepts in every branch of mathematics, from algebra to number theory, from geometry to calculus and beyond.

And by advancing from one proof to a related one, you begin to see how mathematics is a magnificent, self-consistent system with unexpected links between different ideas. Moreover, this system forms the foundation of fields such as physics, engineering, and computer science.

But you don’t have to imagine the exhilaration of constructing a proof. You can do it. You can prove it! Consider these proofs that are not only profound and elegant, but easily within reach of anyone with a background in high-school mathematics:

  • The square root of 2: Can the square root of 2 be expressed as a rational number—that is, as a fraction of two integers? The proof discovered by the ancient Greeks had dangerous consequences for one mathematician.
  • Gauss’s formula: What is the sum of the first 100 positive integers? As a child, the great mathematician Carl Friedrich Gauss discovered that the solution has a simple formula, which can be proved in several different ways.
  • Geometric series: Is the repeating decimal 0.99999… less than 1? Or does it equal 1? The proof surprises many people and provides a launching point into the analysis of infinite geometric series in calculus.
  • Countably infinite sets: An eye-opening proof shows that the set of all rational numbers is the same size as the set of all positive integers, even though there are infinitely many rational numbers between two consecutive integers.

Mathematicians marvel at the clarity that comes from completing a proof. It is as if a light has suddenly switched on in a dark room, bringing simplicity and understanding to what was formerly obscure and confusing. And since research mathematicians spend much of their time working on proofs, you can get a feel for what it’s like at their esoteric heights by putting pencil to paper and working out elementary proofs.

Prove It: The Art of Mathematical Argument initiates you into this thrilling discipline in 24 proof- and information-filled lectures suitable for everyone from high school students to the more math-savvy. The course is taught by award-winning Professor Bruce H. Edwards of the University of Florida. The author of many widely used textbooks, Professor Edwards has a knack for making mathematics as exciting to his audience as it obviously is to him.

In the course, Professor Edwards walks you through scores of proofs, from the simple to the subtle. The accompanying guidebook includes additional practice problems that help you gain confidence and mastery of a challenging, satisfying, and all-important mathematical skill.

Techniques and Tips

The modern concept of mathematical proof goes back 23 centuries to the Greek mathematician Euclid, who introduced the method of proving a conjecture by starting from axioms, or propositions regarded as self-evidently true. Once proved by logic, a conjecture is called a theorem. The beauty of Euclid’s system is that the same conjecture can often be proved in markedly different ways.

In Prove It: The Art of Mathematical Argument, Professor Edwards introduces you to the principles of logic to give you the tools to reason through a proof. Then he surveys a wide range of powerful proof techniques, including these:

  • Direct proof: Start with a hypothesis, do some math, then arrive at the conclusion. This is the most straightforward approach to a proof and is based on the simple logical relation, “P implies Q.”
  • Proof by contradiction: Assume that a mathematical proposition is false. If that leads to a contradiction, then it must be true. Using this technique, Euclid devised an elegant proof showing the true nature of the square root of 2.
  • Induction: Logical induction is used to prove that a given statement is true for all positive integers. The first step is to prove a “base case.” This case establishes that the next case is true, and the next, and the next, ad infinitum.
  • Visual proof: Sometimes geometric figures can be used to show that a mathematical conjecture must be true. One such “proof without words” is credited to James A. Garfield, who later became president of the United States.

A teacher with a knack for bringing abstract material down to earth, Professor Edwards has many practical tips to help sharpen your proof-writing skills. For example,

  • First things first: Before you try to prove a conjecture, stop and ask yourself if it makes sense. Do you believe what is being proposed?
  • Try some examples: Plug in numbers. You may see right away that the conjecture is true and that you’ll be able to prove it.
  • Know where you’re going: Keep your goal in mind as you work on a proof. Use scratch paper to jot down ideas. Often, you’ll see the way to a proof.
  • Don’t be daunted: When you’re studying a finished proof, remember that you don’t see the mathematician’s notes. The proof could be easier than it looks.

Tales of Proofs

Throughout the course, Professor Edwards tells stories behind famous proofs. For example, the Four Color theorem says that no more than four colors are needed to color the regions of a map so that no two adjacent areas have the same color. It’s simple to state, but attempts to prove the Four Color theorem were fruitless until 1976, when two mathematicians used a computer and a technique called enumeration of cases to solve the problem. You get a taste for what’s involved by working through several simpler proofs using this technique.

You also hear about celebrated paradoxes in which logic leads to baffling conclusions, such as Bertrand Russell’s paradox that shook the foundations of set theory. It involves a barber who cuts the hair of all the people who do not cut their own hair—in which case, who cuts the barber’s hair?

And often in Prove It: The Art of Mathematical Argument, you’ll come across unproven conjectures—deep problems that are so far unsolved, despite the efforts of generations of mathematicians. It just goes to show that there are unending adventures ahead in the thrilling quest to prove it!

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24 lectures
 |  Average 30 minutes each
  • 1
    What Are Proofs, and How Do I Do Them?
    Start by proving that two odd numbers multiplied together always give an odd number. Next, look ahead at some of the intriguing proofs you will encounter in the course. Then explore the characteristics of a proof and tips for improving your skill at proving mathematical theorems. x
  • 2
    The Root of Proof—A Brief Look at Geometry
    The model for modern mathematical thinking was forged 2,300 years ago in Euclid’s Elements. Prove three of Euclid’s theorems and investigate his famous fifth postulate dealing with parallel lines. Also, learn how proofs are important in Professor Edwards’s own research. x
  • 3
    The Building Blocks—Introduction to Logic
    Logic is the foundation of mathematical proofs. In the first of three lectures on logic, study the connectors “and” and “or.” When used in combination in mathematical statements, these simple terms can create interesting complexity. See how truth tables are very useful for determining when such statements are true or false. x
  • 4
    More Blocks—Negations and Implications
    Continue your study of logic by looking at negations of statements and the logical operation called implication, which is used in most mathematical theorems. Professor Edwards opens the lecture with a fascinating example of the implication of a false hypothesis that appears to pose a logical puzzle. x
  • 5
    Existence and Uniqueness—Quantifiers
    In the final lecture on logic, explore the quantifiers “for all” and “there exists,” learning how these operations are negated. Quantifiers play a large role in calculus—for example, when defining the concept of a sequence, which you study in greater detail in upcoming lectures. x
  • 6
    The Simplest Road—Direct Proofs
    Begin a series of lectures on different proof techniques by looking at direct proofs, which make straightforward use of a hypothesis to arrive at a conclusion. Try several examples, including proofs involving division and inequalities. Then learn tricks that mathematicians use to make proofs easier than they look. x
  • 7
    Let’s Go Backward—Proofs by Contradiction
    Probe the power of one of the most popular techniques for proving theorems—proof by contradiction. Begin by constructing a truth table for the contrapositive. Then work up to Euclid’s famous proof that answers the question: Can the square root of 2 be expressed as a fraction? x
  • 8
    Let’s Go Both Ways—If-and-Only-If Proofs
    Start with the simple case of an isosceles triangle, defined as having two equal sides or two equal angles. Discover that equal sides and equal angles apply to all isosceles triangles and are an example of an “if-and-only-if” theorem, which occurs throughout mathematics. x
  • 9
    The Language of Mathematics—Set Theory
    Explore elementary set theory, learning the concepts and notation that allow manipulation of sets, their unions, their intersections, and their complements. Then try your hand at proving that two sets are equal, which involves showing that each is a subset of the other. x
  • 10
    Bigger and Bigger Sets—Infinite Sets
    Tackle infinite sets, which pose fascinating paradoxes. For example, the set of integers is a subset of the set of rational numbers, and yet there is a one-to-one correspondence between them. Explore other properties of infinite sets, proving that the real numbers between 0 and 1 are uncountable. x
  • 11
    Mathematical Induction
    In the first of three lectures on mathematical induction, try out this powerful tool for proving theorems about the positive integers. See how an inductive proof is like knocking over a row of dominos: Once the base case pushes over a second case, then by induction all cases fall. x
  • 12
    Deeper and Deeper—More Induction
    What does the decimal 0.99999… forever equal? Is it less than 1? Or does it equal 1? Apply mathematical induction to geometric series to find the solution. Also use induction to find the formulas for other series, including factorials, which are denoted by an integer followed by the “!” sign. x
  • 13
    Strong Induction and the Fibonacci Numbers
    Use a technique called strong induction to prove an elementary theorem about prime numbers. Next, apply strong induction to the famous Fibonacci sequence, verifying the Binet formula, which can specify any number in the sequence. Test the formula by finding the 21-digit-long 100th Fibonacci number. x
  • 14
    I Exist Therefore I Am—Existence Proofs
    Analyze existence proofs, which show that a mathematical object must exist, even if the actual object remains unknown. Close with an elegant and subtle argument proving that there exists an irrational number raised to an irrational power, and the result is a rational number. x
  • 15
    I Am One of a Kind—Uniqueness Proofs
    How do you prove that a given mathematical result is unique? Assume that more than one solution exists and then see if there is a contradiction. Use this technique to prove several theorems, including the important division algorithm from arithmetic. x
  • 16
    Let Me Count the Ways—Enumeration Proofs
    The famous Four Color theorem, dealing with the minimum number of colors needed to distinguish adjacent regions on a map with different colors, was finally proved by a brute force technique called enumeration of cases. Learn how this approach works and why mathematicians dislike it—although they often rely on it. x
  • 17
    Not True! Counterexamples and Paradoxes
    You’ve studied proofs. How about disproofs? How do you show that a conjecture is false? Experience the fun of finding counterexamples. Then explore some famous paradoxes in mathematics, including Bertrand Russell’s barber paradox, which shook the foundations of set theory. x
  • 18
    When 1 = 2—False Proofs
    Strengthen your appreciation for good proofs by looking at bad proofs, including common errors that students make such as dividing by 0 and circular reasoning. Then survey the history of attempts to prove some renowned conjectures from geometry and number theory. x
  • 19
    A Picture Says It All—Visual Proofs
    Before he became the 20th U. S. president, James A. Garfield published an original proof of the Pythagorean theorem that relied on a visual argument. See how pictures play an important role in understanding why a particular mathematical statement may be true. But is a visual proof really a proof? x
  • 20
    The Queen of Mathematics—Number Theory
    The great mathematician Carl Friedrich Gauss once said that if mathematics is the queen of the sciences, then number theory is the queen of mathematics. Embark on the study of this fascinating discipline by proving theorems about prime numbers. x
  • 21
    Primal Studies—More Number Theory
    Dig deeper into prime numbers and number theory by proving a conjecture that asserts that there are arbitrarily large gaps between successive prime numbers. Then turn to some celebrated conjectures in number theory, which are easy to state but which have withstood all attempts to prove them. x
  • 22
    Fun with Triangular and Square Numbers
    Use different proof techniques to explore square and triangular numbers. Square numbers are numbers such as 1, 4, 9, and 16 that are the squares of integers. Triangular numbers represent the total dots needed to form an equilateral triangle, such as 1, 3, 6, and 10. x
  • 23
    Perfect Numbers and Mersenne Primes
    Investigate the intriguing link between perfect numbers and Mersenne primes. A number is perfect if it equals the sum of all its divisors, excluding itself. Mersenne primes are prime numbers that are one less than a power of 2. Oddly, the known examples of both classes of numbers are 47. x
  • 24
    Let’s Wrap It Up—The Number e
    Prove some properties of the celebrated number e, the base of the natural logarithm, which plays a crucial role in precalculus and calculus. Close with a challenging proof testing whether e is rational or irrational—just as you did with the square root of 2 in Lecture 7. x

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  • Bibliography

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Your professor

Bruce H. Edwards

About Your Professor

Bruce H. Edwards, Ph.D.
University of Florida
Dr. Bruce H. Edwards is Professor of Mathematics at the University of Florida. Professor Edwards received his B.S. in Mathematics from Stanford University and his Ph.D. in Mathematics from Dartmouth College. After his years at Stanford, he taught mathematics at a university near Bogot·, Colombia, as a Peace Corps volunteer. Professor Edwards has won many teaching awards at the University of Florida, including Teacher of...
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Reviews

Prove It: The Art of Mathematical Argument is rated 4.7 out of 5 by 31.
Rated 5 out of 5 by from Good Course This is an excellent course. I like the professor style, he's very clear and concise. I couldn't stop watching the first day.
Date published: 2017-04-03
Rated 5 out of 5 by from Great Overview of Proofs First of all, this is one of my favorite courses I've watched so far. The level of mathematics isn't too deep and should be understandable by those with a grasp of Algebra. As a math education major in college, I struggled with proofs. In fact, for many students, proofs are hard to read and hard to do. A high school or college student who is "good" at math may successfully navigate courses like algebra, calculus, only to struggle when they hit a proof-based upper-level math class (e.g., Discrete Math, Linear Algebra). Why? In my experience, students aren't always given a framework of how to think about and do proofs. Professor Edwards gives a nice introduction to the topic that helps take out some of the mystery to doing proofs. He covers some of the types of proofs you'll encounter (e.g., direct proofs, proof by contradiction, and induction). He also gives nice tips like when you encounter a mathematical conjecture you'd like to prove, ask yourself, do you believe it? He encourages you to play around with it and get a feel for it. He encourages you to use scratch paper to work out solutions, i.e., you're not going to get it right the first time! I think the course provides a great foundation and will build confidence in reading and doing proofs. If you're a high school student or college student who will major/minor in a math-related discipline, I would definitely view these lectures...I wish I would have! Then if you'd like to take your study of proofs even further, get a text on proofs (e.g., How to Read and Do Proofs by Solow, or How to Prove It by Velleman); but, you'll find the foundation you got from this set of lectures will make the next level of study more digestible! This course will also provide a nice foundation and help reinforce concepts in other Great Courses math videos, e.g., the Discrete Math course by professor Benjamin (which is a much more math and proof intensive course).
Date published: 2016-10-27
Rated 5 out of 5 by from Very Satisfying Course Mathematical proofs had been my nemesis since honors trig in high school, where we were required to prove a lot of the theorems, but were never given any training on how to do this. Later, as an engineering undergrad student, I wanted to prove the the theorems taught in calculus, differential equations, etc., but I didn't have the time or the training in mathematical proofs so I learned to just hit the "I believe" button. This course gives you a great background in how to do mathematical proofs, using direct proof, induction, contradictions, etc. I would have loved to have had this course available to me in high school or engineering school. This course helped me to correct what I felt was a huge deficiency in my education. Highly recommended for high school or college students studying math, science, or engineering, who haven't been exposed to how to do basic mathematical proofs. Really basic algebra and geometry would be the only prerequisite. Also recommended for those long out of school, for whom mathematical proofs are an intriguing mystery.
Date published: 2016-10-10
Rated 5 out of 5 by from Excellent overview of proofs This is professor Edwards at his best. Just the right mix of theory and practice. This would be great as an intro course but it has enough meat for a good review of proofs even into lower level graduate courses. Professor Edwards has a very easy to listen to manner and a dry sense of humor that should put students at ease.
Date published: 2016-06-25
Rated 5 out of 5 by from I liked very much proving by math induction Wow, this is a beautiful math course given by a beautiful mind. During my first year of college I was scared of mathematical induction. I always wanted to learn about this powerful math methodology. Professor Edwards is an excellent teacher, He included 3 beautiful lectures regarding this topic. In addition, the lectures about mathematical logic are outstanding. The entire course is very valuable. I would like to ask the Teaching Company to consider a new course on Linear Algebra by Professor Edwards to complement his other excellent courses on Pre-calculus and Calculus.
Date published: 2016-03-30
Rated 5 out of 5 by from Prove it An invigorating course superbly taught and presented. Excellent graphics. Highly recommended.
Date published: 2015-10-06
Rated 5 out of 5 by from Not so esoteric If you are interested in math or science and then this is a must. If you have to take math and don't like it, then this course will help unlock math's mysteries. If you're interested in being a business leader or a leader in general this course will help you in most needed critical thinking skills. The professor is excellent so good in fact that I took two more courses of his.
Date published: 2015-02-10
Rated 4 out of 5 by from Prove It prove its value I am only in the first part of this course but I am impressed with the simplicity with which it is presented. So far everything has been of great interest. The only fault so far has been in the editing. In the first lecture, after describing the Pythagorean theorem they present an illustration of a right triangle and label the sides x2, y2 and z2. If these are real numbers then Fermat's final theorem would be false. The sides should have been labeled x, y, and z. Once they are squared they will no longer make a triangle.
Date published: 2015-01-12
Rated 5 out of 5 by from Great Course. Awesome Professor. I really enjoyed watching all of the lectures. The professor really made this subject approachable and interesting. His genuine, down-to-earth presentation of the subject makes the content less intimidating and easier to understand. The pace is very good and each lecture logically builds on the previous one. I purchased the Calculus courses taught by Professor Edwards solely based on how well this material was presented.
Date published: 2014-12-24
Rated 5 out of 5 by from Excellent Course Many years ago I studied physics; therefore, I am familiar with the topic of the advanced math. From my perspective, this course inspires me to rethink about some of my understanding of the topics in mathematic that I have learned in the past. I strongly recommend this course to students of physics, engineering, and philosophy.
Date published: 2014-11-13
Rated 5 out of 5 by from fun course Lots of fun whether you are a technical type or have nothing more than a good facility with algebra. The many methods of mathematical proofs were very well described by this excellent teacher. He has the style of your favorite grandfather; smart but not condescending. There is mathematical 'elegance' in proving the inner workings of even seemingly simple algorithms.
Date published: 2014-03-17
Rated 2 out of 5 by from Mathemata mathematicis propter If one of your personal mottoes is: "Mathemata mathematicis propter" then this course is for you. While viewing these lectures, I finally began to understand why I have difficulty, even disdain, for maths. I have little to no appreciation for the “beauty” or “elegance” in the art of maths. Admittedly, I have rarely had the affect of the genius of any creative art. In other words, no art really “speaks” to me. My loss.... Perhaps others will find this course enlightening. Algebra and algebra-er.... This is the first course in my Teaching Company courses library that didn’t motivate me to want to study further. Not so much that it's boring, but, for me, thin on practicality. Should be titled: A Closer Look at Algebra. This could be a good course for algebra lovers. Otherwise, I had no applicable use for this topic. No offense to Professor Edwards or to the good people at the Teaching Company. With this course, I have proven to myself that I just don't like math. In the famous words of Professor Devadoss, “Who cares?”.
Date published: 2013-12-25
Rated 5 out of 5 by from A Course that Lives Up to the Company Name This DVD really lives up to the company name. It is a great course! Professor Edwards has an excellent presentation and the video complements the topics perfectly. While watching these DVDs, I have also been taking Kevin Devlin’s Coursera Course “Introduction to Mathematical Thinking.” Both course cover a lot of the same material, but “Prove It” is far superior. Not only is it visually superior, but Edwards explanations are short and to the point. I would guess I get four or five times as much knowledge per hour from Edwards’ course.
Date published: 2013-10-24
Rated 5 out of 5 by from Fun and fruitful I love this course! I took some proof-based classes as an undergraduate, and I am a pretty hardcore user of mathematics in my profession. It has been a while since I sat down to prove anything, and I started plenty rusty. I left feeling ready to tackle new things. This course requires active participation to get the most out of it. Dr. Edwards is a great teacher, and guides one through the thickets, gently but with plenty of challenges. I had a pad of paper in my hands the whole time, and he mentioned things that I later went and looked for on the internet. If you are new to proofs, this is a good choice, and if you have done proofs, but long ago, it is a great refresher. This was my first TGC purchase, but will certainly not be my last.
Date published: 2013-09-08
Rated 5 out of 5 by from Most Enjoyable Course Dr. Edwards is a masterful professor. All of the subjects that are covered in this course are understandable to anyone who has moderate mathematical maturity. To those students who are interested in learning more, or (like myself) want a refresher in one’s knowledge of problem-solving, this is an excellent course. Each lecture contains pertinent examples that illustrate the technique of each proof, and where solutions have yet to be discovered, Dr. Edwards suggests unsolved problems that the student might choose to pursue. As a mathematician myself, I would highly recommend this course to anyone who is interested in the fine art of mathematical proofs and solution techniques.
Date published: 2013-07-17
Rated 5 out of 5 by from A Truly Great Course. I am amazed at how this course was put together. Excellent use of technology paired with examples. This makes the material easy to follow and retain. Professor Edwards is well paced for the learner. He never rushes anything and is clear before moving forward. I highly recommend any of his courses. I hope he can continue to produce higher mathematics courses. This guy is a living example of great teaching.
Date published: 2013-05-07
Rated 5 out of 5 by from One of the Best in the Catalog I wish I had had this course when I was a full time student. This is simply the best course I have seen on a math topic and it is one of the best in the Teaching Company's collection. This course is incredibly useful in giving the background on proofs that simply does not exist in general math books and is impossibly dry in books on proofs. I cannot recommend this too highly.
Date published: 2013-04-06
Rated 5 out of 5 by from Excellent and highly recommended Great content, very interesting, and well presented by a really outstanding and highly engaging instructor. Highly recommended. A fun course!
Date published: 2013-03-25
Rated 5 out of 5 by from Prove it As usual professor Edwards is excellent. Great presentation of complex ideas and concepts. Clear definition with examples that "prove" the subject under discussion. To those that like Mathematics, this course will answer many "why's" and will provide the insights to proofs that unfortunately were not provided in College. I encourage The Great Courses company and Professor Edwards to expand the subjects offered in these courses like, Non-Euclidean Geometry, Advance Calculus or the like. More Problems at the end of each chapter, of the Guidebook will help consolidating the concepts learned during the lecture. "Prove it" is a great course.
Date published: 2013-01-01
Rated 5 out of 5 by from Great intro to mathematical proof and more Mathematical reasoning, and mathematical proof, is where high school math turns into college math. Having enjoyed Professor Edwards' other TC courses on high school level calculus and precalculus I was looking forward to his new course on Mathematical Argument, and he did not disappoint. Although maybe Professor Edwards' style of presenting is more perfectly suited for a high school level course, he managed to keep this new course interesting from beginning to end. He obviously loves math, and it is difficult not to get infected with his enthusiasm when another theorem gets proved properly in this course. In addition to the lessons that deal strictly with mathematical proof and argument, this course also begins to give an introduction to number theory, making me look forward to yet another TC course out there...
Date published: 2012-11-09
Rated 5 out of 5 by from You Too Can "Prove It." Let me begin by stating I’m a retired mathematics instructor who had a very successful and rewarding career of 39 years and I actually used the PreCalculus and Calculus textbooks, which I thought were the best available, written by Dr. Edwards and his coauthors. In “Prove It: The Art of Mathematical Argument” Professor Edwards shows why mathematical proof is indeed the gold standard of knowledge. He leads you on a thought-provoking journey that allows you see beyond the “how” to do mathematics into the realm of “why” mathematical statements are true. After illustrating the basic principles of logic, he proceeds to show you the abstract order behind all things. He uses many techniques including direct proof, proof by contradiction, induction, and visual proof. Like his previous Great Courses, Dr. Edwards’ presentation is logical and clear. His carefully chosen examples are insightful and illuminating. His pleasant and enthusiastic style keeps the course moving in an interesting and educational manner. By the end of the course you will have experienced the thrill of understanding proofs and actually constructing your own. Lest you begin to conclude all things have been proven, Professor Edwards also talks about many unproven conjectures that illustrate the never-ending and exciting quest to “prove it”. WARNING: Mathematics is not a spectator subject; you cannot just listen to an instructor, no matter how good he might be, but must actually work out examples yourself in order to find and correct mistakes that may be unique to you. It takes practice along with an excellent instructor to guarantee success; therefore, I highly recommend you work out the additional practice problems given in the accompanying guidebook in order to help you gain confidence and mastery of this challenging, satisfying, and important skill. This course could change your attitude toward mathematics and is highly recommended.
Date published: 2012-10-26
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