Fiktor

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753 reputation

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	location	St. Petersburg, Russia
	age	27
visits	member for	2 years, 10 months
	seen	May 28 at 1:10
stats	profile views	164

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19 Answers

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15	Prove that $\prod_{k=1}^{n-1}\sin\frac{k \pi}{n} = \frac{n}{2^{n-1}}$
4	How do you show that $d\theta = \frac{x dy - y dx }{x^2 + y^2}$?
4	Packing disjoint family of discs with radii $\tfrac{1}{2}, \tfrac{1}{3}, \tfrac{1}{4},\ldots$ inside the unit disc
4	Continuous function satisfying $f^{k}(x)=f(x^k)$
4	Cutting the Cake Problem

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753 Reputation

+10	Cutting the Cake Problem
+30	Prove that $\prod_{k=1}^{n-1}\sin\frac{k \pi}{n} = \frac{n}{2^{n-1}}$
+35	Packing disjoint family of discs with radii $\tfrac{1}{2}, \tfrac{1}{3}, \tfrac{1}{4},\ldots$ inside the unit disc
+5	Fundamental group of GL(n,C) is isomorphic to Z. How to learn to prove facts like this?

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5 Questions

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14	Fundamental group of GL(n,C) is isomorphic to Z. How to learn to prove facts like this?
8	Upper-triangular matrix is invertible iff its diagonal is invertible: C*-algebra case
7	In which commutative algebras does any derivation possess a flow?
5	Generalization of cos: is this function known?
1	Notation of homeomorphism from B(H) to B(K), corresponding to unitary transformation of Hilbert spaces

41 Tags

15 complex-numbers	4 geometry
15 trigonometry	4 puzzle
7 real-analysis × 3	4 fair-division
4 functional-equations × 2	4 set-theory
4 differential-geometry × 2	4 calculus

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