Question

Computing (quickly) the multiplicity of a (prime) divisor

score 160 · Answer 1 · 2026-04-17 08:56:45

160

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Computing (quickly) the multiplicity of a (prime) divisor

Published on 17 Apr 2026 - 8:56

score 79 · Answer 2 · 2026-04-16 17:22:59

79

Views

Find all $a\in\mathbb{N}$ such that $3a+6$ divides $a^2+11$

Published on 16 Apr 2026 - 17:22

score 618 · Answer 3 · 2026-04-12 06:42:10

618

Views

Problem from Discrete Mathematics and its application for Rosen section 4.4

Published on 12 Apr 2026 - 6:42

score 86 · Answer 4 · 2026-04-14 08:08:08

86

Views

Is this proof correct for congruences?

Published on 14 Apr 2026 - 8:08

score 119 · Answer 5 · 2026-04-16 07:19:26

119

Views

$2^r-1$ divides $2^{rs}-1$

Published on 16 Apr 2026 - 7:19

score 289 · Answer 6 · 2026-03-25 11:11:41

289

Views

Minimal positive solution of linear congruence equations in multiple variables

Published on 25 Mar 2026 - 11:11

score 410 · Answer 7 · 2026-04-11 01:59:55

410

Views

How to find the last $4$ digits of $2^{2020}$ with Euler

Published on 11 Apr 2026 - 1:59

score 73 · Answer 8 · 2026-03-25 09:17:09

73

Views

Showing that there's no solution to the congruence $x^{2}+3y^{2}\equiv2\mod3$

Published on 25 Mar 2026 - 9:17

score 57 · Answer 9 · 2026-04-16 22:52:46

57

Views

Find inverse element of $1+2\alpha$ in $\mathbb{F}_9$

Published on 16 Apr 2026 - 22:52

score 47 · Answer 10 · 2026-04-16 11:06:40

47

Views

IS $(\mathbb{Z}_4,+) \rightarrow (\mathbb{Z}_5^{*},\cdot), n\pmod 4 \mapsto 2^n \pmod 5 $ well-defined??

Published on 16 Apr 2026 - 11:06

score 41 · Answer 11 · 2026-04-15 10:17:49

41

Views

Is $( \mathbb{ Z}_{10}^{},\cdot) \rightarrow (\mathbb{Z}_5^{},\cdot), n\pmod {10} \mapsto n \pmod 5 $ well-defined?

Published on 15 Apr 2026 - 10:17

score 57 · Answer 12 · 2026-04-15 20:04:00

57

Views

Is $f: ( \mathbb{ Z}_{10},+) \rightarrow ( \mathbb{ Z}_{5} \times \mathbb{ Z}_{2},+), n\pmod {10} \mapsto (n \pmod 5,n \pmod 2) $ surjective?

Published on 15 Apr 2026 - 20:04

score 60 · Answer 13 · 2026-04-12 13:25:45

60

Views

Is $( \mathbb{ Z}^,\cdot) \rightarrow (\mathbb{Z}_5^{},\cdot), n \mapsto n \pmod 5 $ well-defined?

Published on 12 Apr 2026 - 13:25

score 29 · Answer 14 · 2026-04-15 23:52:51

29

Views

Why when $t\equiv n\pmod s$, $n$ is also $t - s\lfloor \frac{t}{s}\rfloor$?

Published on 15 Apr 2026 - 23:52

score 72 · Answer 15 · 2026-04-15 06:33:53

72

Views

Is $(\mathbb{Z_4},+) \rightarrow (\mathbb{Z_5^{*}},\cdot), n\bmod 4 \mapsto n \bmod 5 $ a homomorphism?

Published on 15 Apr 2026 - 6:33

List Question

Computing (quickly) the multiplicity of a (prime) divisor

Find all $a\in\mathbb{N}$ such that $3a+6$ divides $a^2+11$

Problem from Discrete Mathematics and its application for Rosen section 4.4

Is this proof correct for congruences?

$2^r-1$ divides $2^{rs}-1$

Minimal positive solution of linear congruence equations in multiple variables

How to find the last $4$ digits of $2^{2020}$ with Euler

Showing that there's no solution to the congruence $x^{2}+3y^{2}\equiv2\mod3$

Find inverse element of $1+2\alpha$ in $\mathbb{F}_9$

IS $(\mathbb{Z}_4,+) \rightarrow (\mathbb{Z}_5^{*},\cdot), n\pmod 4 \mapsto 2^n \pmod 5 $ well-defined??

Is $( \mathbb{ Z}_{10}^{},\cdot) \rightarrow (\mathbb{Z}_5^{},\cdot), n\pmod {10} \mapsto n \pmod 5 $ well-defined?

Is $f: ( \mathbb{ Z}_{10},+) \rightarrow ( \mathbb{ Z}_{5} \times \mathbb{ Z}_{2},+), n\pmod {10} \mapsto (n \pmod 5,n \pmod 2) $ surjective?

Is $( \mathbb{ Z}^,\cdot) \rightarrow (\mathbb{Z}_5^{},\cdot), n \mapsto n \pmod 5 $ well-defined?

Why when $t\equiv n\pmod s$, $n$ is also $t - s\lfloor \frac{t}{s}\rfloor$?

Is $(\mathbb{Z_4},+) \rightarrow (\mathbb{Z_5^{*}},\cdot), n\bmod 4 \mapsto n \bmod 5 $ a homomorphism?

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