Question

Monotone convergence theorem-proof by contradiction

score 1k · Answer 1 · 2020-10-12 11:27:59

1k

Views

Monotone convergence theorem-proof by contradiction

Published on 12 Oct 2020 - 11:27

score 208 · Answer 2 · 2020-10-14 17:03:51

208

Views

Fake proof, symmetric and transitive relation is already reflexive

Published on 14 Oct 2020 - 17:03

score 94 · Answer 3 · 2020-10-14 18:34:10

94

Views

Show existence of improper integral by convergent series

Published on 14 Oct 2020 - 18:34

score 168 · Answer 4 · 2020-10-15 16:14:35

168

Views

Every group of order $4n+2$ has a subgroup of index $2$.

Published on 15 Oct 2020 - 16:14

score 237 · Answer 5 · 2026-03-27 22:03:43

237

Views

How is this calculation showing that $\partial_{\mu}W_{\nu}$ transforms as a tensor wrong?

Published on 27 Mar 2026 - 22:03

score 182 · Answer 6 · 2020-10-20 03:00:20

182

Views

Proof: For all real numbers $x$, If $x^2−5x+4≥0$, then either $x≤1$ or $x≥4$. Is this a valid technique?

Published on 20 Oct 2020 - 3:00

score 107 · Answer 7 · 2020-10-22 12:27:49

107

Views

STEP 1988 Paper 3 Pure Maths Q3: Who is wrong?

Published on 22 Oct 2020 - 12:27

score 69 · Answer 8 · 2020-10-25 13:24:55

69

Views

How is it that $0\times\cos(\theta-\arctan{i})=\cos\theta+i\sin\theta$??

Published on 25 Oct 2020 - 13:24

score 108 · Answer 9 · 2020-11-01 12:38:19

108

Views

If $A\subseteq B\cup C$ then $A\subseteq B$ or $A\subseteq C$.

Published on 01 Nov 2020 - 12:38

score 92 · Answer 10 · 2020-11-06 14:38:36

92

Views

Confusion about Change of Variables in Integration

Published on 06 Nov 2020 - 14:38

score 258 · Answer 11 · 2020-11-12 23:23:53

258

Views

Fault in this proof of $\overline{\lim} (a_n+b_n) = \overline{\lim} a_n + \overline{\lim} b_n $ for bounded sequences $(a_n)$ and $(b_n)$

Published on 12 Nov 2020 - 23:23

score 636 · Answer 12 · 2026-03-28 06:41:48

636

Views

Does L'Hopital's rule imply that $\lim_{x\to a}\frac{f'(x)}{g'(x)} = \lim_{x\to a}\frac{f(x)}{g(x)}$ always?

Published on 28 Mar 2026 - 6:41

score 186 · Answer 13 · 2020-11-21 10:15:19

186

Views

Wrong theorem - The number 1 is the largest integer

Published on 21 Nov 2020 - 10:15

score 486 · Answer 14 · 2020-11-24 01:39:14

486

Views

“Proof” that zero is equal to one by infinitely subtracting numbers

Published on 24 Nov 2020 - 1:39

score 477 · Answer 15 · 2020-11-25 19:34:58

477

Views

Proof of $\operatorname{arccot}(x)= \arctan(\frac{1}{x})$

Published on 25 Nov 2020 - 19:34

List Question

Monotone convergence theorem-proof by contradiction

Fake proof, symmetric and transitive relation is already reflexive

Show existence of improper integral by convergent series

Every group of order $4n+2$ has a subgroup of index $2$.

How is this calculation showing that $\partial_{\mu}W_{\nu}$ transforms as a tensor wrong?

Proof: For all real numbers $x$, If $x^2−5x+4≥0$, then either $x≤1$ or $x≥4$. Is this a valid technique?

STEP 1988 Paper 3 Pure Maths Q3: Who is wrong?

How is it that $0\times\cos(\theta-\arctan{i})=\cos\theta+i\sin\theta$??

If $A\subseteq B\cup C$ then $A\subseteq B$ or $A\subseteq C$.

Confusion about Change of Variables in Integration

Fault in this proof of $\overline{\lim} (a_n+b_n) = \overline{\lim} a_n + \overline{\lim} b_n $ for bounded sequences $(a_n)$ and $(b_n)$

Does L'Hopital's rule imply that $\lim_{x\to a}\frac{f'(x)}{g'(x)} = \lim_{x\to a}\frac{f(x)}{g(x)}$ always?

Wrong theorem - The number 1 is the largest integer

“Proof” that zero is equal to one by infinitely subtracting numbers

Proof of $\operatorname{arccot}(x)= \arctan(\frac{1}{x})$

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