Question

Proof: For all integers $x$ there exists an integer $y$ so that $3$ divides $x+y$ and $3$ divides $x-y$

score 2.3k · Answer 1 · 2026-03-26 19:02:06

2.3k

Views

Proof: For all integers $x$ there exists an integer $y$ so that $3$ divides $x+y$ and $3$ divides $x-y$

Published on 26 Mar 2026 - 19:02

score 382 · Answer 2 · 2026-04-02 10:12:34

382

Views

Prove that $W_1$ is a subspace of $\mathbb{R}^n$.

Published on 02 Apr 2026 - 10:12

score 52 · Answer 3 · 2026-04-03 10:19:53

52

Views

Is this a valid proof that $f_{x_0}:X \to \mathbb{R}$ is continuous.

Published on 03 Apr 2026 - 10:19

score 904 · Answer 4 · 2018-10-03 23:34:56

904

Views

Proof that the Michael line is a topology.

Published on 03 Oct 2018 - 23:34

score 74 · Answer 5 · 2026-03-28 02:05:24

74

Views

Evaluating $\int_{\pi/2}^{3\pi/2}\frac{1}{\pi\sqrt{1+d\cos(\gamma)}}d\gamma$

Published on 28 Mar 2026 - 2:05

score 67 · Answer 6 · 2018-10-03 23:44:28

67

Views

Is this short proof ambiguous? Prove $\partial \partial S \subset \partial S.$

Published on 03 Oct 2018 - 23:44

score 331 · Answer 7 · 2018-10-04 02:05:10

331

Views

Why are set operations always showed with a Venn Diagram where both A and B are intersecting?

Published on 04 Oct 2018 - 2:05

score 411 · Answer 8 · 2026-04-09 12:29:24

411

Views

Fourier sine series.

Published on 09 Apr 2026 - 12:29

score 351 · Answer 9 · 2026-04-12 02:42:12

351

Views

Proof if $x$ is order $\phi(n)$ in $\mathbb{Z}/n \mathbb{Z}$ all inverses are powers of $x$.

Published on 12 Apr 2026 - 2:42

score 47 · Answer 10 · 2026-03-26 09:17:53

47

Views

$x<\sup Y$ if and only if $\exists y\in Y: x<y$

Published on 26 Mar 2026 - 9:17

score 73 · Answer 11 · 2026-03-29 06:29:03

73

Views

choose the correct option about topological space $(\mathbb{Z},T)$?

Published on 29 Mar 2026 - 6:29

score 72 · Answer 12 · 2026-04-10 17:56:24

72

Views

Finding an expression for the generating function of a sequence using algebraic operations

Published on 10 Apr 2026 - 17:56

score 187 · Answer 13 · 2026-04-02 10:38:30

187

Views

Class of all vector spaces over $\mathbb{R}$ and Cantor's diagonalization

Published on 02 Apr 2026 - 10:38

score 262 · Answer 14 · 2018-10-04 14:27:58

262

Views

Prove by the limit definition that $\lim_{x\rightarrow 2}\frac{x^2-1}{x-3}=-3$

Published on 04 Oct 2018 - 14:27

score 567 · Answer 15 · 2026-03-25 12:54:54

567

Views

Prove that there exists no non-zero analytic function such that $f(\frac{1}{n})$=0 for all n

Published on 25 Mar 2026 - 12:54

List Question

Proof: For all integers $x$ there exists an integer $y$ so that $3$ divides $x+y$ and $3$ divides $x-y$

Prove that $W_1$ is a subspace of $\mathbb{R}^n$.

Is this a valid proof that $f_{x_0}:X \to \mathbb{R}$ is continuous.

Proof that the Michael line is a topology.

Evaluating $\int_{\pi/2}^{3\pi/2}\frac{1}{\pi\sqrt{1+d\cos(\gamma)}}d\gamma$

Is this short proof ambiguous? Prove $\partial \partial S \subset \partial S.$

Why are set operations always showed with a Venn Diagram where both A and B are intersecting?

Fourier sine series.

Proof if $x$ is order $\phi(n)$ in $\mathbb{Z}/n \mathbb{Z}$ all inverses are powers of $x$.

$x<\sup Y$ if and only if $\exists y\in Y: x<y$

choose the correct option about topological space $(\mathbb{Z},T)$?

Finding an expression for the generating function of a sequence using algebraic operations

Class of all vector spaces over $\mathbb{R}$ and Cantor's diagonalization

Prove by the limit definition that $\lim_{x\rightarrow 2}\frac{x^2-1}{x-3}=-3$

Prove that there exists no non-zero analytic function such that $f(\frac{1}{n})$=0 for all n

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