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• 1,851 votes cast

 40 Factorize $(x+1)(x+2)(x+3)(x+6)- 3x^2$ 33 Prove that $i^i$ is a real number 17 What is the difference between plus-minus and minus-plus? 11 Factoring $(x+1)(x+2)(x+3)(x+4)+1$ 8 How to compute the indefinite integral $\int \frac u{u+1}\,\mathrm du$?

### Reputation (2,270)

 +80 Prove that $i^i$ is a real number +10 Factorize $(x+1)(x+2)(x+3)(x+6)- 3x^2$ +10 converge absolutely/conditionally : (cos(npi)) / ((n+1)ln(n+1))? +10 Differentiability implies Lipschitz continuity

### Questions (2)

 5 Physical interpretation of $q$-deformation 3 Show that an operator is bounded (from Reed and Simon)

### Tags (62)

 54 algebra-precalculus × 3 17 functional-analysis × 8 45 polynomials × 3 17 integration × 5 40 factoring 17 notation 33 exponentiation 14 functions × 3 33 complex-numbers 12 sequences-and-series × 5

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 Mathematics 2,270 rep 21125 Physics 101 rep 2 Skeptics 101 rep 1 Japanese Language 101 rep 2 MathOverflow 101 rep 3