List questions from fake-proofs

Published on 03 Sep 2020 - 12:13

104

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proof that $ \frac{1}{1 \cdot 2} + \frac{1}{2 \cdot 3} + \dots + \frac{1}{n(n-1)} = \frac{3}{2} - \frac{1}{n} $

Published on 05 Sep 2020 - 1:36

259

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Is this a valid use of Skolemization?

Published on 06 Sep 2020 - 10:15

143

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Question on Fundamental Theorem of Calculus

Published on 07 Sep 2020 - 20:23

116

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What is wrong with this argument that $(-2)^{1/4}=4^{1/8}$?

Published on 11 Sep 2020 - 17:12

34

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The following is an incorrect proof of “if a set of n balls contains a green ball then all the balls in the set are green”. Find the error.

Published on 17 Sep 2020 - 12:39

173

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Where is the mistake in this false proof using indefinite integral?

Published on 19 Sep 2020 - 5:42

119

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Composition $f\circ g$ not Riemann-integrable, where $f$ Riemann-integrable and $g$ continuous

Published on 25 Sep 2020 - 22:08

66

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Please find error in proof If c|a and c|b then $cgcd(a/c, b/c)=gcd(a, b)$

Published on 26 Sep 2020 - 10:17

49

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Bogus proof of relation between two non negative real numbers

Published on 26 Sep 2020 - 18:58

1.6k

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Why doesn't trig substitution work for definite integrals?

Published on 26 Sep 2020 - 21:33

86

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Proof By induction of $n^3+2n$, is that circular reasoning?

Published on 03 Oct 2020 - 19:55

19

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Breaking inductive hypothesis into 2 groups

Published on 25 Mar 2026 - 15:56

698

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There's a deeper concept behind this fake proof

Published on 07 Oct 2020 - 20:45

44

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Number combinations.

Published on 11 Oct 2020 - 22:27

List Question

“Proof” that $\frac{1}{7}$ is irrational

proof that $ \frac{1}{1 \cdot 2} + \frac{1}{2 \cdot 3} + \dots + \frac{1}{n(n-1)} = \frac{3}{2} - \frac{1}{n} $

Is this a valid use of Skolemization?

Question on Fundamental Theorem of Calculus

What is wrong with this argument that $(-2)^{1/4}=4^{1/8}$?

The following is an incorrect proof of “if a set of n balls contains a green ball then all the balls in the set are green”. Find the error.

Where is the mistake in this false proof using indefinite integral?

Composition $f\circ g$ not Riemann-integrable, where $f$ Riemann-integrable and $g$ continuous

Please find error in proof If c|a and c|b then $cgcd(a/c, b/c)=gcd(a, b)$

Bogus proof of relation between two non negative real numbers

Why doesn't trig substitution work for definite integrals?

Proof By induction of $n^3+2n$, is that circular reasoning?

Breaking inductive hypothesis into 2 groups

There's a deeper concept behind this fake proof

Number combinations.

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