List questions from fake-proofs

Published on 26 Dec 2017 - 15:02

4.4k

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False proof that $ρe^{iθ} = ρ$ and so complex numbers do not exist?

Published on 27 Dec 2017 - 17:13

124

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Apparent contradiction when working out $\int \frac{dx}{x\ln |x|}$

Published on 28 Dec 2017 - 1:31

84

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6=-6? Is it possible?

Published on 29 Dec 2017 - 11:29

199

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Math books that discuss incorrect theorems

Published on 30 Dec 2017 - 10:38

105

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How did I arrive at a logical contradiction?

Published on 27 Mar 2026 - 22:03

128

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Show that exists some subspace $T$ such that $V=S_j\oplus T$ for all $j=1,\ldots,k$

Published on 08 Jan 2018 - 2:35

193

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Velleman, exercise 23 section 3.3 on families of sets

Published on 08 Jan 2018 - 11:39

8.3k

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What are some classic fallacious proofs?

Published on 20 Jul 2010 - 20:56

13.7k

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How come $32.5 = 31.5$? (The "Missing Square" puzzle.)

Published on 21 Jul 2010 - 7:53

19.3k

Views

Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?

Published on 25 Mar 2026 - 6:54

26k

Views

Where is the flaw in this "proof" that 1=2? (Derivative of repeated addition)

Published on 24 Feb 2026 - 1:53

2.4k

Views

"Proof" that ZFC is inconsistent using Turing machines

Published on 24 Sep 2010 - 14:24

3.7k

Views

What is wrong in my proof that 90 = 95? Or is it correct?

Published on 22 Oct 2010 - 9:28

114.8k

Views

The staircase paradox, or why $\pi\ne4$

Published on 03 Dec 2010 - 13:44

List Question

Does every bounded sublattice of a bounded lattice have the same top and bottom?

False proof that $ρe^{iθ} = ρ$ and so complex numbers do not exist?

Apparent contradiction when working out $\int \frac{dx}{x\ln |x|}$

6=-6? Is it possible?

Math books that discuss incorrect theorems

How did I arrive at a logical contradiction?

Show that exists some subspace $T$ such that $V=S_j\oplus T$ for all $j=1,\ldots,k$

Velleman, exercise 23 section 3.3 on families of sets

What are some classic fallacious proofs?

How come $32.5 = 31.5$? (The "Missing Square" puzzle.)

Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?

Where is the flaw in this "proof" that 1=2? (Derivative of repeated addition)

"Proof" that ZFC is inconsistent using Turing machines

What is wrong in my proof that 90 = 95? Or is it correct?

The staircase paradox, or why $\pi\ne4$

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