Question

Where is the mistake? $-1=(-1)^{2/2}=\left(\left (-1\right)\displaystyle ^2\right)^{1/2}=1^{1/2}=\sqrt 1=1$

score 93 · Answer 1 · 2020-11-29 12:16:42

93

Views

Where is the mistake? $-1=(-1)^{2/2}=\left(\left (-1\right)\displaystyle ^2\right)^{1/2}=1^{1/2}=\sqrt 1=1$

Published on 29 Nov 2020 - 12:16

score 42 · Answer 2 · 2020-12-02 19:17:25

42

Views

What is wrong with this proof there is no $\omega$-th worldly cardinal

Published on 02 Dec 2020 - 19:17

score 218 · Answer 3 · 2026-03-30 05:25:24

218

Views

What is wrong with this proof there is no $\omega$-th worldly cardinal

Published on 30 Mar 2026 - 5:25

score 79 · Answer 4 · 2020-12-07 17:23:31

79

Views

Problem in "proof" that nonempty perfect set without rationals cannot exist.

Published on 07 Dec 2020 - 17:23

score 507 · Answer 5 · 2026-03-30 05:25:30

507

Views

What is wrong with this proof that inaccessible cardinals are inconsistent

Published on 30 Mar 2026 - 5:25

score 117 · Answer 6 · 2020-12-08 20:31:11

117

Views

Where is the flaw in my proof claiming that if $P$ is a prime minimal over $\operatorname{ann}M$, then $P=\operatorname{rad}(\operatorname{ann}M)$.

Published on 08 Dec 2020 - 20:31

score 102 · Answer 7 · 2020-12-15 22:22:52

102

Views

'Proof' that $f''(x)=\frac{f'(x)}{x}$

Published on 15 Dec 2020 - 22:22

score 54 · Answer 8 · 2020-12-16 07:13:19

54

Views

Finding the flaw in $-12=(-12)^1=(-12)^{6/6}=\cdots=12$

Published on 16 Dec 2020 - 7:13

score 185 · Answer 9 · 2026-03-29 18:03:45

185

Views

Is the halting problem still an open problem?

Published on 29 Mar 2026 - 18:03

score 91 · Answer 10 · 2020-12-25 20:00:45

91

Views

Fallacy involving Euler's formula

Published on 25 Dec 2020 - 20:00

score 404 · Answer 11 · 2020-12-26 03:02:59

404

Views

What's wrong with this proof of $3=0$ starting from $x^2+x+1=0$?

Published on 26 Dec 2020 - 3:02

score 90 · Answer 12 · 2020-12-30 18:07:25

90

Views

Fake proof regarding continuity.

Published on 30 Dec 2020 - 18:07

score 158 · Answer 13 · 2020-12-31 05:56:14

158

Views

Proof regarding continuity and Dirichlet function.

Published on 31 Dec 2020 - 5:56

score 84 · Answer 14 · 2021-01-01 11:03:37

84

Views

$A$ and $A'$ have the same eigenvectors: Flaw in the proof?

Published on 01 Jan 2021 - 11:03

score 64 · Answer 15 · 2021-01-01 16:19:43

64

Views

Is it okay to raise to the power of $n$ (where $n\in\mathbb{R}$) on both sides in Euler's Identity?

Published on 01 Jan 2021 - 16:19

List Question

Where is the mistake? $-1=(-1)^{2/2}=\left(\left (-1\right)\displaystyle ^2\right)^{1/2}=1^{1/2}=\sqrt 1=1$

What is wrong with this proof there is no $\omega$-th worldly cardinal

What is wrong with this proof there is no $\omega$-th worldly cardinal

Problem in "proof" that nonempty perfect set without rationals cannot exist.

What is wrong with this proof that inaccessible cardinals are inconsistent

Where is the flaw in my proof claiming that if $P$ is a prime minimal over $\operatorname{ann}M$, then $P=\operatorname{rad}(\operatorname{ann}M)$.

'Proof' that $f''(x)=\frac{f'(x)}{x}$

Finding the flaw in $-12=(-12)^1=(-12)^{6/6}=\cdots=12$

Is the halting problem still an open problem?

Fallacy involving Euler's formula

What's wrong with this proof of $3=0$ starting from $x^2+x+1=0$?

Fake proof regarding continuity.

Proof regarding continuity and Dirichlet function.

$A$ and $A'$ have the same eigenvectors: Flaw in the proof?

Is it okay to raise to the power of $n$ (where $n\in\mathbb{R}$) on both sides in Euler's Identity?

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