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CS1
  • Member for 11 years
  • Last seen more than a month ago
11 votes
2 answers
14k views

A cardinality of a graph

6 votes
7 answers
927 views

Two people A and B throwing dice

6 votes
4 answers
302 views

How do I calculate $2^{47} \pmod{\! 65}$? [duplicate]

5 votes
3 answers
3k views

What is the meaning of $x*\sqrt{3} \mod 1$?

5 votes
3 answers
6k views

What are the finite order elements of $\mathbb{Q}/\mathbb{Z}$?

4 votes
2 answers
1k views

What are element with finite order at $\mathbb{C}^*/U$?

4 votes
2 answers
257 views

What is the meaning of $\bigsqcup$?

4 votes
1 answer
207 views

Prove that $\varphi$ is automorphism

4 votes
2 answers
134 views

How do I prove that $a\in (\mathbb{Z}_{p}^{*})^2 \Leftrightarrow a^{\frac{p-1}{2}}\equiv 1 \pmod p$

4 votes
5 answers
140 views

Find polynomial with some conditions

3 votes
1 answer
403 views

How can I know if a pile in "Grundy's game" have a winning strategy?

3 votes
2 answers
840 views

Help with understanding the polynomial long division algorithm

3 votes
1 answer
129 views

How to show that two groups makes $S_n$

3 votes
2 answers
348 views

Question about arithmetic–geometric mean [duplicate]

3 votes
2 answers
422 views

Question about bisection method

2 votes
2 answers
73 views

Question about normal sub-groups

2 votes
2 answers
103 views

I need to prove that $\mathbb{C}/\mathbb{R}\cong \mathbb{R}$

2 votes
3 answers
1k views

About isomorphism of rings and fields

2 votes
5 answers
482 views

I'd like to get explain about complex roots

2 votes
1 answer
244 views

Nice problem of combinatorics..

2 votes
1 answer
102 views

We are giving $m$ prizes to $n$ people at lottery...

2 votes
3 answers
5k views

How to symbol a sub-group?

2 votes
3 answers
572 views

A power series from $\frac{x}{9+x^2}$

2 votes
2 answers
2k views

How to multiply permutations [duplicate]

2 votes
3 answers
65 views

Question about subgroups and Lagrange thorem

2 votes
1 answer
58 views

Question about homomorphism of groups

2 votes
2 answers
410 views

Proving something with Wilson theorem [duplicate]

2 votes
2 answers
112 views

$X:\Omega \to \mathbb{N}$ is random variable, How to prove that $E[x]=\sum_{i} \Pr(X\ge i)$?

2 votes
1 answer
1k views

Find if there is a matrix that her sum of each column and row representing two vectors

2 votes
4 answers
434 views

An easy way to calculate $12^{101} \bmod 551$?

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