VelvetThunder
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### Questions (350)

 43 How does the divisibility graphs work? 33 Checking if a number is a Fibonacci or not? 30 How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression? 30 A pencil approach to find $\sum \limits_{i=1}^{69} \sqrt{\left( 1+\frac{1}{i^2}+\frac{1}{(i+1)^2}\right)}$ 27 Proving : $\bigl(1+\frac{1}{n+1}\bigr)^{n+1} \gt (1+\frac{1}{n})^{n}$

### Reputation (9,915)

 +10 Probability question about married couples +10 Is zero odd or even? -2 How to find the least $N$ such that $N \equiv 7 \mod 180$ or $N \equiv 7 \mod 144$ but $N \equiv 1 \mod 7$? +5 Proving: “The trace of an idempotent matrix equals the rank of the matrix”

 33 How many ways are there for 8 men and 5 women to stand in a line so that no two women stand next to each other? 25 Free online mathematical software 25 Online tool for making graphs (vertices and edges)? 15 Number of permutations of $n$ where no number $i$ is in position $i$ 11 How to convert $\sqrt{\frac{5}{3}}$ to $\frac{\sqrt{15}}{3}$?

### Tags (112)

 103 combinatorics × 107 25 graph-theory × 5 62 algebra-precalculus × 150 25 big-list × 2 55 permutations × 7 25 online-resources × 2 50 math-software × 4 25 experimental-mathematics 26 elementary-number-theory × 62 19 faq × 3

### Accounts (18)

 Mathematics 9,915 rep 553132 Programming Puzzles & Code Golf 1,310 rep 518 Stack Overflow 1,070 rep 21741 English Language & Usage 407 rep 4819 Area 51 151 rep 3