Question

Proof that if $a$ and $b$ must be coprime, $a$ has an inverse $\pmod{b}$

score 508 · Answer 1 · 2026-03-29 14:20:16

508

Views

Proof that if $a$ and $b$ must be coprime, $a$ has an inverse $\pmod{b}$

Published on 29 Mar 2026 - 14:20

score 645 · Answer 2 · 2026-03-25 03:18:18

645

Views

Show that $\ker(\phi)$ is finitely generated

Published on 25 Mar 2026 - 3:18

score 120 · Answer 3 · 2026-04-11 20:34:23

120

Views

Which of the following map are constant ?? IIT-kanpur PhD paper

Published on 11 Apr 2026 - 20:34

score 756 · Answer 4 · 2026-04-12 07:08:09

756

Views

Finding maximal in $\Bbb Z[x]$

Published on 12 Apr 2026 - 7:08

score 84 · Answer 5 · 2026-03-28 21:44:22

84

Views

Give an example where $Ann(N) +Ann(K) \ne Ann(N\cap K)$

Published on 28 Mar 2026 - 21:44

score 1.5k · Answer 6 · 2018-10-06 08:46:45

1.5k

Views

Prove that if $A \subseteq B$ and B is countable, then $A$ is either countable or finite.

Published on 06 Oct 2018 - 8:46

score 56 · Answer 7 · 2026-03-30 03:38:28

56

Views

Can't see a mistake in my proof, monic composition and monicity of it's composites.

Published on 30 Mar 2026 - 3:38

score 9.5k · Answer 8 · 2026-03-25 14:25:57

9.5k

Views

Proof Verification: $\tilde{\beta_1}$ is an unbiased estimator of $\beta_1$ obtained by assuming intercept is zero

Published on 25 Mar 2026 - 14:25

score 2.5k · Answer 9 · 2026-03-25 20:10:57

2.5k

Views

Show that if $ p\mid n$ then $\phi(np)=p\phi(n)$

Published on 25 Mar 2026 - 20:10

score 1.1k · Answer 10 · 2018-10-06 18:17:53

1.1k

Views

Please check my proof for $\sup AB=\sup A \sup B.$

Published on 06 Oct 2018 - 18:17

score 175 · Answer 11 · 2018-10-06 19:26:36

175

Views

Let $\{a_n\}_{n = 1}^{\infty}$ and $\{b_n\}_{n = 1}^{\infty}$ be two sequences of real numbers s.t $|a_n -b_n| < \frac{1}{n}$

Published on 06 Oct 2018 - 19:26

score 42 · Answer 12 · 2018-10-06 20:39:39

42

Views

Is this proof of$ (A \cup B) \cap (A \cup C) \subseteq A \cup (B \cap C)$ right?

Published on 06 Oct 2018 - 20:39

score 108 · Answer 13 · 2026-03-25 04:40:47

108

Views

General form of the $n^{\text{th}}$ derivative of $x^x$

Published on 25 Mar 2026 - 4:40

score 1.6k · Answer 14 · 2026-04-02 15:12:48

1.6k

Views

Graph that joins an odd vertex with an even vertex

Published on 02 Apr 2026 - 15:12

score 2.2k · Answer 15 · 2026-04-12 00:04:44

2.2k

Views

Prove or disprove if the graphs $G$ and $H$ are isomorphic

Published on 12 Apr 2026 - 0:04

List Question

Proof that if $a$ and $b$ must be coprime, $a$ has an inverse $\pmod{b}$

Show that $\ker(\phi)$ is finitely generated

Which of the following map are constant ?? IIT-kanpur PhD paper

Finding maximal in $\Bbb Z[x]$

Give an example where $Ann(N) +Ann(K) \ne Ann(N\cap K)$

Prove that if $A \subseteq B$ and B is countable, then $A$ is either countable or finite.

Can't see a mistake in my proof, monic composition and monicity of it's composites.

Proof Verification: $\tilde{\beta_1}$ is an unbiased estimator of $\beta_1$ obtained by assuming intercept is zero

Show that if $ p\mid n$ then $\phi(np)=p\phi(n)$

Please check my proof for $\sup AB=\sup A \sup B.$

Let $\{a_n\}_{n = 1}^{\infty}$ and $\{b_n\}_{n = 1}^{\infty}$ be two sequences of real numbers s.t $|a_n -b_n| < \frac{1}{n}$

Is this proof of$ (A \cup B) \cap (A \cup C) \subseteq A \cup (B \cap C)$ right?

General form of the $n^{\text{th}}$ derivative of $x^x$

Graph that joins an odd vertex with an even vertex

Prove or disprove if the graphs $G$ and $H$ are isomorphic

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