André Nicolas
Reputation
399/400 score
30 345 665
Impact
~9.0m people reached

• 48 helpful flags
• 17,127 votes cast

 406 Why can ALL quadratic equations be solved by the quadratic formula? 371 Is the following matrix invertible? 208 Infiniteness of non-twin primes. 128 How I can prove that the sequence $\sqrt{2} , \sqrt{2\sqrt{2}}, \sqrt{2\sqrt{2\sqrt{2}}}$ converges to 2? 90 “Negative” versus “Minus”

### Reputation (401,118)

 -2 Modifications of the necessary condition for series convergence +10 Balls in bin. Adding similar coloured ball at every turn. +10 Let x and y be integers, prove that if 3 doesn't divide x and 3 doesn't divide y then 3 divides $x^2 - y^2$ +10 $n$ balls are thrown randomly into $k$ bins - how many are empty?

### Questions (0)

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### Tags (556)

 5k calculus × 1742 3k number-theory × 742 5k probability × 2621 3k sequences-and-series × 726 4k elementary-number-theory × 1043 3k real-analysis × 815 3k combinatorics × 1116 2k integration × 662 3k algebra-precalculus × 680 2k limits × 579

### Accounts (7)

 Mathematics 401,118 rep 30345665 Mathematics Educators 151 rep 3 Seasoned Advice 101 rep TeX - LaTeX 101 rep MathOverflow 101 rep