Eric Naslund
Reputation
52,840
173/100 score
10 117 207
Impact
~910k people reached

 209 How can I evaluate $\sum_{n=0}^\infty (n+1)x^n$ 127 $\int_{-\infty}^{+\infty} e^{-x^2} dx$ with complex analysis 118 Direct Proof that $1 + 3 + 5 + \cdots+ (2n - 1) = n\cdot n$ 88 100 Soldiers riddle 79 What is special about the numbers 9801, 998001, 99980001 ..?

### Reputation (52,840)

 +20 How can I evaluate $\sum_{n=0}^\infty (n+1)x^n$ +10 Minimum and maximum +10 Closed form for $\int_{-\infty}^\infty\operatorname{sech}(x)\operatorname{sech}(a\, x)\ dx$ +5 Not lifting your pen on the $n\times n$ grid

### Questions (31)

 227 The Mathematics of Tetris 45 Limits: How to evaluate $\lim\limits_{x\rightarrow \infty}\sqrt[n]{x^{n}+a_{n-1}x^{n-1}+\cdots+a_{0}}-x$ 32 Fermat's Last Theorem and Kummer's Objection 30 A series problem by Knuth 30 Explicitly reconstructing a function from its moments

### Tags (231)

 977 sequences-and-series × 106 506 integration × 61 952 number-theory × 156 485 prime-numbers × 72 735 analytic-number-theory × 138 388 complex-analysis × 51 661 calculus × 102 333 real-analysis × 64 508 elementary-number-theory × 58 315 convergence × 23

### Accounts (6)

 Mathematics 52,840 rep 10117207 MathOverflow 7,665 rep 13678 Chess 1,252 rep 11123 TeX - LaTeX 205 rep 138 Physics 123 rep 5