Question

Proving that inverse of the unit circle parametrization is not continuous.

score 84 · Answer 1 · 2026-04-14 12:18:28

84

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Proving that inverse of the unit circle parametrization is not continuous.

Published on 14 Apr 2026 - 12:18

score 217 · Answer 2 · 2026-04-28 13:48:32

217

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A proof of Steinhaus theorem

Published on 28 Apr 2026 - 13:48

score 48 · Answer 3 · 2026-04-15 20:27:28

48

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Is $(a,b)\oplus (c,d)=(a+c+1,b+d)$ and $\lambda \otimes (a,b)=(\lambda a+\lambda-1,\lambda b)$ a vectorspace?

Published on 15 Apr 2026 - 20:27

score 75 · Answer 4 · 2026-04-17 10:41:31

75

Views

Verification: $G=\mathbb{Z}_{p^3}\times \mathbb{Z}_{p^2}$, how many subgroups in $G$ are with order $p^2$?

Published on 17 Apr 2026 - 10:41

score 122 · Answer 5 · 2026-04-30 05:23:24

122

Views

Formula for Mertens Function $M\left(x\right)$ in terms of the Prime counting function $\pi\left(x\right)$ using inclusion-exclusion

Published on 30 Apr 2026 - 5:23

score 208 · Answer 6 · 2026-04-17 07:39:29

208

Views

proof that the dimension of a subspace is less than or equal to the dimension of the vector space

Published on 17 Apr 2026 - 7:39

score 76 · Answer 7 · 2026-04-14 22:43:32

76

Views

Proof verification: $f^{-1}(X - Y) = f^{-1}(X)-f^{-1}(Y)$

Published on 14 Apr 2026 - 22:43

score 76 · Answer 8 · 2026-04-12 09:17:20

76

Views

For which parameter is the matrix diagonalizable? and finding the diagonal matrix

Published on 12 Apr 2026 - 9:17

score 183 · Answer 9 · 2026-04-12 18:56:48

183

Views

Is my solution a typical solution? Any better solution? Exercise 8 on p.46 in Exercises 2C in "Measure, Integration & Real Analysis" by Sheldon Axler.

Published on 12 Apr 2026 - 18:56

score 161 · Answer 10 · 2026-04-15 03:05:29

161

Views

Simplify $\frac{\frac{x+1}{2x}}{\frac{x^2-1}{x}}$

Published on 15 Apr 2026 - 3:05

score 58 · Answer 11 · 2026-04-15 07:04:46

58

Views

Show if R is simple. then f is injective

Published on 15 Apr 2026 - 7:04

score 63 · Answer 12 · 2026-04-15 07:40:52

63

Views

Integrating monomials over $\mathbb{S}^{n-1}$ - Folland

Published on 15 Apr 2026 - 7:40

score 105 · Answer 13 · 2026-04-15 04:44:00

105

Views

Could you say that the unxepected hanging paradox is a falsidical paradox?

Published on 15 Apr 2026 - 4:44

score 164 · Answer 14 · 2026-04-11 17:15:06

164

Views

New (?) derivation for the angle sum identity for sine via the cosine rule

Published on 11 Apr 2026 - 17:15

score 70 · Answer 15 · 2026-04-16 08:18:37

70

Views

Solve $\frac{d^2}{dx^2} X + \alpha^2 X = 0$

Published on 16 Apr 2026 - 8:18

List Question

Proving that inverse of the unit circle parametrization is not continuous.

A proof of Steinhaus theorem

Is $(a,b)\oplus (c,d)=(a+c+1,b+d)$ and $\lambda \otimes (a,b)=(\lambda a+\lambda-1,\lambda b)$ a vectorspace?

Verification: $G=\mathbb{Z}_{p^3}\times \mathbb{Z}_{p^2}$, how many subgroups in $G$ are with order $p^2$?

Formula for Mertens Function $M\left(x\right)$ in terms of the Prime counting function $\pi\left(x\right)$ using inclusion-exclusion

proof that the dimension of a subspace is less than or equal to the dimension of the vector space

Proof verification: $f^{-1}(X - Y) = f^{-1}(X)-f^{-1}(Y)$

For which parameter is the matrix diagonalizable? and finding the diagonal matrix

Is my solution a typical solution? Any better solution? Exercise 8 on p.46 in Exercises 2C in "Measure, Integration & Real Analysis" by Sheldon Axler.

Simplify $\frac{\frac{x+1}{2x}}{\frac{x^2-1}{x}}$

Show if R is simple. then f is injective

Integrating monomials over $\mathbb{S}^{n-1}$ - Folland

Could you say that the unxepected hanging paradox is a falsidical paradox?

New (?) derivation for the angle sum identity for sine via the cosine rule

Solve $\frac{d^2}{dx^2} X + \alpha^2 X = 0$

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