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45 Answers

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15	Proving $\sum\limits_{k=0}^{n} (-1)^{k} \binom{n}{k} = 0$
11	Find all polynomials that fix $\mathbb Q$ and the irrationals
9	What is the problem in this solution to the Two Child Problem?
8	Remember trig identities like $\cos(\pi/3) = 1/2$
8	If a finite set of rational numbers sums to one, does one of the rationals have a denominator equal to the LCM of all the denominators?

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+10	Proving $\sum\limits_{k=0}^{n} (-1)^{k} \binom{n}{k} = 0$
+10	Graph on the cover of Bollobás's “Combinatorics”
+10	Finding the GCD of three numbers?
+5	Infinite Sequence of Inscribed Pentagrams - Where does it converge?

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2 Questions

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11	Infinite Sequence of Inscribed Pentagrams - Where does it converge?
9	Generalization of “easy” 1-D proof of Brouwer fixed point theorem

45 Tags

26 probability × 7	15 sequences-and-series
22 combinatorics × 9	12 problem-solving × 2
22 polynomials × 3	10 complex-analysis × 2
15 elementary-number-theory × 3	9 homework × 4
15 binomial-coefficients	9 geometry × 4

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