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  2. Mathematical proof - Wikipedia

    en.wikipedia.org/wiki/Mathematical_proof

    P. Oxy. 29, one of the oldest surviving fragments of Euclid's Elements, a textbook used for millennia to teach proof-writing techniques. The diagram accompanies Book II, Proposition 5. [1] A mathematical proof is a deductive argument for a mathematical statement, showing that the stated assumptions logically guarantee the

  3. Proof by contradiction - Wikipedia

    en.wikipedia.org/wiki/Proof_by_contradiction

    An early occurrence of proof by contradiction can be found in Euclid's Elements, Book 1, Proposition 6: [7] If in a triangle two angles equal one another, then the sides opposite the equal angles also equal one another. The proof proceeds by assuming that the opposite sides are not equal, and derives a contradiction.

  4. Direct proof - Wikipedia

    en.wikipedia.org/wiki/Direct_proof

    Direct Proof from Larry W. Cusick's How To Write Proofs. Direct Proofs from Patrick Keef and David Guichard's Introduction to Higher Mathematics. Direct Proof section of Richard Hammack's Book of Proof

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  6. What We Believe but Cannot Prove - Wikipedia

    en.wikipedia.org/wiki/What_We_Believe_but_Cannot...

    The book consists of responses to a question posed by the Edge Foundation, with answers as short as one sentence and as long as a few pages. [1] Among the 107 published contributors are scientists and philosophers such as Richard Dawkins , Daniel C. Dennett , Jared Diamond , Rebecca Goldstein , Steven Pinker , Sir Martin Rees , and Craig Venter ...

  7. Proofs from THE BOOK - Wikipedia

    en.wikipedia.org/wiki/Proofs_from_THE_BOOK

    Proofs from THE BOOK is a book of mathematical proofs by Martin Aigner and Günter M. Ziegler. The book is dedicated to the mathematician Paul Erdős, who often referred to "The Book" in which God keeps the most elegant proof of each mathematical theorem. During a lecture in 1985, Erdős said, "You don't have to believe in God, but you should ...

  8. Proofs That Really Count - Wikipedia

    en.wikipedia.org/wiki/Proofs_That_Really_Count

    Proofs That Really Count: the Art of Combinatorial Proof is an undergraduate-level mathematics book on combinatorial proofs of mathematical identies.That is, it concerns equations between two integer-valued formulas, shown to be equal either by showing that both sides of the equation count the same type of mathematical objects, or by finding a one-to-one correspondence between the different ...

  9. Reverse Mathematics: Proofs from the Inside Out - Wikipedia

    en.wikipedia.org/wiki/Reverse_Mathematics:...

    The book begins with a historical overview of the long struggles with the parallel postulate in Euclidean geometry, [3] and of the foundational crisis of the late 19th and early 20th centuries, [6] Then, after reviewing background material in real analysis and computability theory, [1] the book concentrates on the reverse mathematics of theorems in real analysis, [3] including the Bolzano ...

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