Question

Computing the homology of $\mathbb{S}^1$ attached with two $2$-cells via degree $2$ and $3$

score 322 · Answer 1 · 2018-01-22 19:51:03

322

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Computing the homology of $\mathbb{S}^1$ attached with two $2$-cells via degree $2$ and $3$

Published on 22 Jan 2018 - 19:51

score 63 · Answer 2 · 2026-03-16 02:21:08

63

Views

Is this a correct derivation of completing the square?

Published on 16 Mar 2026 - 2:21

score 65 · Answer 3 · 2026-03-22 03:52:13

65

Views

Proof Verification: $\left\|v-\frac{v}{\|v\|}\right\|= \min\{\|v-u\|:u\in S\}$

Published on 22 Mar 2026 - 3:52

score 56 · Answer 4 · 2026-03-25 01:36:11

56

Views

Solution verification: Find all possible $x$ that satisfy $5x\equiv 1\;\;(mod\;\;6)$.

Published on 25 Mar 2026 - 1:36

score 1.4k · Answer 5 · 2026-03-25 01:37:49

1.4k

Views

Prove that ℤ/nℤ is a field- prove closed under addition

Published on 25 Mar 2026 - 1:37

score 83 · Answer 6 · 2026-03-25 02:59:05

83

Views

An inequality concerning arithmetic mean

Published on 25 Mar 2026 - 2:59

score 61 · Answer 7 · 2018-01-23 12:37:58

61

Views

Question about positive operators: If $\mathcal{R}(S)=\mathcal{R}(S^{1/2})$, why $\mathcal{R}(S)$ is closed?

Published on 23 Jan 2018 - 12:37

score 204 · Answer 8 · 2018-01-23 13:12:34

204

Views

Proving that a specific string in in a set of strings

Published on 23 Jan 2018 - 13:12

score 36 · Answer 9 · 2018-01-23 13:17:51

36

Views

find Base for sub space

Published on 23 Jan 2018 - 13:17

score 282 · Answer 10 · 2026-03-23 09:07:33

282

Views

Invertible Linear Map

Published on 23 Mar 2026 - 9:07

score 55 · Answer 11 · 2018-01-23 17:11:49

55

Views

What is the probability of pulling out at least 2 hearts consecutively, having 3 extractions with replacement out of a complete deck?

Published on 23 Jan 2018 - 17:11

score 163 · Answer 12 · 2026-03-22 13:16:21

163

Views

Prove that $\sum_{i=1}^n\lvert[a_i]\rvert$ is even iff $n$ is even

Published on 22 Mar 2026 - 13:16

score 50 · Answer 13 · 2018-01-23 18:30:37

50

Views

Interior is always open verification

Published on 23 Jan 2018 - 18:30

score 115 · Answer 14 · 2018-01-23 18:44:14

115

Views

About the value of the integral $\int_0^\pi\sqrt{1+t^2}\,\mathrm dt$

Published on 23 Jan 2018 - 18:44

score 85 · Answer 15 · 2018-01-23 19:26:37

85

Views

Showing that $g(x) = \begin{cases} f(x), & \ x \ne 0 \\ c, & \ x = 0 \end{cases}$ is Riemann integrable where $f$ is Riemann integrable

Published on 23 Jan 2018 - 19:26

List Question

Computing the homology of $\mathbb{S}^1$ attached with two $2$-cells via degree $2$ and $3$

Is this a correct derivation of completing the square?

Proof Verification: $\left\|v-\frac{v}{\|v\|}\right\|= \min\{\|v-u\|:u\in S\}$

Solution verification: Find all possible $x$ that satisfy $5x\equiv 1\;\;(mod\;\;6)$.

Prove that ℤ/nℤ is a field- prove closed under addition

An inequality concerning arithmetic mean

Question about positive operators: If $\mathcal{R}(S)=\mathcal{R}(S^{1/2})$, why $\mathcal{R}(S)$ is closed?

Proving that a specific string in in a set of strings

find Base for sub space

Invertible Linear Map

What is the probability of pulling out at least 2 hearts consecutively, having 3 extractions with replacement out of a complete deck?

Prove that $\sum_{i=1}^n\lvert[a_i]\rvert$ is even iff $n$ is even

Interior is always open verification

About the value of the integral $\int_0^\pi\sqrt{1+t^2}\,\mathrm dt$

Showing that $g(x) = \begin{cases} f(x), & \ x \ne 0 \\ c, & \ x = 0 \end{cases}$ is Riemann integrable where $f$ is Riemann integrable

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