List questions from fake-proofs

Published on 07 Aug 2013 - 7:23

61

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mean of two consecutive number helps proving both number equals..

Published on 07 Aug 2013 - 12:03

2.5k

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number of points on two circles

Published on 14 Aug 2013 - 12:56

418

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Does this Fermat's Last Theorem's "Proof" employ circular reasoning?

Published on 14 Aug 2013 - 14:32

276

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How do I explain the fallacy $\frac00=2$ in this case?

Published on 19 Aug 2013 - 4:59

335

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Infinity and solution of $x+2=x$

Published on 19 Aug 2013 - 22:01

7.6k

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math fallacy problem: $-1= (-1)^3 = (-1)^{6/2} = \sqrt{(-1)^6}= 1$?

Published on 20 Aug 2013 - 18:39

165

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What is wrong with this induction?

Published on 21 Aug 2013 - 16:21

83.8k

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Expense and Balance Mismatch

Published on 23 Aug 2013 - 12:53

420

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How find $\Gamma{\left(\frac{8}{9}\right)}=\frac{9-\sqrt{14}+\sqrt{75-32\sqrt{3}}}{33}\cdot\sqrt[4]{182}$

Published on 28 Mar 2026 - 10:29

3.9k

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Open surjective continuous functions being closed.

Published on 25 Mar 2026 - 20:32

835

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I am almost certain the book is wrong on this "proof" of a limit.

Published on 04 Sep 2013 - 2:53

87

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Verifying the proof of this Lemma

Published on 12 Sep 2013 - 9:10

6.5k

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What is wrong with this funny proof that 2 = 4 using infinite exponentiation?

Published on 27 Mar 2026 - 11:24

196

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What are some good subtly incorrect proofs of obviously incorrect results?

Published on 13 Sep 2013 - 3:55

List Question

Starting with $\frac{-1}{1}=\frac{1}{-1}$ and taking square root: proves $1=-1$

mean of two consecutive number helps proving both number equals..

number of points on two circles

Does this Fermat's Last Theorem's "Proof" employ circular reasoning?

How do I explain the fallacy $\frac00=2$ in this case?

Infinity and solution of $x+2=x$

math fallacy problem: $-1= (-1)^3 = (-1)^{6/2} = \sqrt{(-1)^6}= 1$?

What is wrong with this induction?

Expense and Balance Mismatch

How find $\Gamma{\left(\frac{8}{9}\right)}=\frac{9-\sqrt{14}+\sqrt{75-32\sqrt{3}}}{33}\cdot\sqrt[4]{182}$

Open surjective continuous functions being closed.

I am almost certain the book is wrong on this "proof" of a limit.

Verifying the proof of this Lemma

What is wrong with this funny proof that 2 = 4 using infinite exponentiation?

What are some good subtly incorrect proofs of obviously incorrect results?

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