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Math S.E: Useless mods and thankless users.

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 80 The sum of irrationals is irrational? 40 Induction: $\sum_{k=0}^n \binom nk k^2 = n(1+n)2^{n-2}$ 39 Proving an alternating Euler sum: $\sum_{k=1}^{\infty} \frac{(-1)^{k+1} H_k}{k} = \frac{1}{2} \zeta(2) - \frac{1}{2} \log^2 2$ 37 Logic question: Ant walking a cube 37 Find all roots of $\,(x + 1)(x + 2)(x + 3)^2(x + 4)(x + 5) = 360$

# 1 Reputation

 +3 A generalization of a matrix to cube? +10 Compactness of $x^4+y^4=1$ +10 Find the numbers satisfying $x+y=19$ and $x^3+y^3=2071$ +10 Why can't you divide matrices?

# 42 Questions

 105 List of Interesting Math Videos/ Documentaries 48 Why is $\omega$ the smallest $\infty$? 44 “Closed” form for $\sum \frac{1}{n^n}$ 30 A Bernoulli number identity and evaluating $\zeta$ at even integers 22 Set Theoretic Definition of Numbers

# 285 Tags

 2k calculus × 496 806 limit × 195 1k sequences-and-series × 303 721 elementary-number-theory × 168 1k homework × 381 574 algebra-precalculus × 154 1k real-analysis × 242 529 trigonometry × 103 995 integration × 279 507 linear-algebra × 165

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