Question

Proof that the set of Natural numbers are equal to the Real numbers

score 236 · Answer 1 · 2026-03-25 04:41:45

236

Views

Proof that the set of Natural numbers are equal to the Real numbers

Published on 25 Mar 2026 - 4:41

score 66 · Answer 2 · 2018-06-19 12:22:30

66

Views

Erroneous proof that derivative tending to $\infty$ implies that the function is not uniformly continuous.

Published on 19 Jun 2018 - 12:22

score 122 · Answer 3 · 2018-06-22 08:22:09

122

Views

Questions about the statement "Every number can be specified by less than twenty words."

Published on 22 Jun 2018 - 8:22

score 229 · Answer 4 · 2018-06-22 09:20:59

229

Views

How to prove that $-x$ is not equal to $x$ just because they yield the same result when in $x^2$

Published on 22 Jun 2018 - 9:20

score 832 · Answer 5 · 2018-06-22 09:33:46

832

Views

On The "Commutative" Properties Of Subtraction And Division

Published on 22 Jun 2018 - 9:33

score 58 · Answer 6 · 2018-06-27 04:35:34

58

Views

Wrong proof for the variance of a sum of normally-distributed variables?

Published on 27 Jun 2018 - 4:35

score 256 · Answer 7 · 2018-06-28 08:00:16

256

Views

$ \operatorname{dist}(w,A) \ge \operatorname{dist}(w, \partial A)?$ What is the mistake in this proof?

Published on 28 Jun 2018 - 8:00

score 251 · Answer 8 · 2018-07-04 02:33:31

251

Views

Lesser-known fake proofs

Published on 04 Jul 2018 - 2:33

score 142 · Answer 9 · 2018-07-04 20:56:44

142

Views

Uniform limit of functions with intermediate value property has intermediate value property? Where is the error in this proof?

Published on 04 Jul 2018 - 20:56

score 346 · Answer 10 · 2018-07-09 00:04:38

346

Views

What is the correct proof that when $\epsilon$ decreases (in a limit) then the largest $\delta$ should also decrease?

Published on 09 Jul 2018 - 0:04

score 114 · Answer 11 · 2018-07-10 08:54:26

114

Views

About an exercise in Rudin's book

Published on 10 Jul 2018 - 8:54

score 331 · Answer 12 · 2018-07-13 16:24:21

331

Views

Finding a mistake in this 'proof' that $1 = 2$.

Published on 13 Jul 2018 - 16:24

score 1k · Answer 13 · 2026-03-25 03:06:58

1k

Views

Adding infinite and finite numbers: why doesn't 0=1?

Published on 25 Mar 2026 - 3:06

score 1.7k · Answer 14 · 2018-07-22 03:31:37

1.7k

Views

What is wrong in this proof by strong induction that all natural numbers are even

Published on 22 Jul 2018 - 3:31

score 1.1k · Answer 15 · 2018-07-22 17:08:14

1.1k

Views

Fake proof that $1$ is the solution of $x^2+x+1=0$

Published on 22 Jul 2018 - 17:08

List Question

Proof that the set of Natural numbers are equal to the Real numbers

Erroneous proof that derivative tending to $\infty$ implies that the function is not uniformly continuous.

Questions about the statement "Every number can be specified by less than twenty words."

How to prove that $-x$ is not equal to $x$ just because they yield the same result when in $x^2$

On The "Commutative" Properties Of Subtraction And Division

Wrong proof for the variance of a sum of normally-distributed variables?

$ \operatorname{dist}(w,A) \ge \operatorname{dist}(w, \partial A)?$ What is the mistake in this proof?

Lesser-known fake proofs

Uniform limit of functions with intermediate value property has intermediate value property? Where is the error in this proof?

What is the correct proof that when $\epsilon$ decreases (in a limit) then the largest $\delta$ should also decrease?

About an exercise in Rudin's book

Finding a mistake in this 'proof' that $1 = 2$.

Adding infinite and finite numbers: why doesn't 0=1?

What is wrong in this proof by strong induction that all natural numbers are even

Fake proof that $1$ is the solution of $x^2+x+1=0$

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