Robert Israel
Reputation
206,997
983/1000 score
10 130 317
Impact
~3.1m people reached

 281 Is there another simpler method to solve this elementary school math problem? 88 Slice of pizza with no crust 81 Help find hard integrals that evaluate to $59$? 77 The last digit of $2^{2006}$ 75 Is this way of teaching how to solve equations dangerous somehow?

### Reputation (206,997)

 +30 How to solve $f'(x)=f'(\frac{x}{2})$ +10 If $f(\frac{x+y}{2})=\frac{f(x)+f(y)}{2}$, then find $f(2)$ +10 How can I calculate OEIS A144311 efficiently? +10 intersection of boundaries have Lebesgue measure 0

### Questions (4)

 27 Fibonacci $\equiv -1 \mod p^2$ 18 Embedding as a subgroup 10 Diophantine equation $(x+y)(x+y+1) - kxy = 0$ 8 Integer solutions of $x^3 = 7y^3 + 6 y^2+2 y$?

### Tags (703)

 2k linear-algebra × 692 983 integration × 381 2k real-analysis × 657 978 sequences-and-series × 345 2k calculus × 584 862 matrices × 418 1k complex-analysis × 522 777 algebra-precalculus × 200 1k probability × 573 714 differential-equations × 477

### Accounts (5)

 Mathematics 206,997 rep 10130317 MathOverflow 241 rep 12 Mathematica 131 rep 1 German Language 101 rep 1 Stack Overflow 86 rep 3