Luboš Motl
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 Feb 7 answered Proving the convergnce of a sequence Feb 6 answered Finding all permutations which satisfy given condition Feb 4 answered Compute $(\sin4^\circ)^2 +(\sin8^\circ)^2+(\sin12^\circ)^2+\cdots+(\sin176^\circ)^2$ Jan 30 answered Difference between continuous and uncountable set. Jan 26 answered Convergence test of $S=\frac{1}{\ln 2} \sum_{k=1}^\infty \ln (1+\frac{1}{k(k+2)}) \ln k$ Jan 25 answered How can I prove that for a Killing vector $\nabla^a \nabla_a \xi^\mu = -R^b_a \xi^a$? Jan 25 answered How to prove $\sin3θ=3\sinθ-4\sin^3θ$ Jan 19 answered Finding Lie algebra isomorphisms Jan 18 answered Limit as $x$ goes to infinity Jan 15 answered Normal Distribution sample mean and population mean? Jan 14 answered Change of variables from multiple to single Jan 14 answered How many elements set $\{\cos(\frac{2\pi k}{n})| k \in \mathbb Z\}$ has, $n \in \mathbb N$ Dec 29 answered Range of $(x+\sqrt{x})(10-x+\sqrt{10-x})$ Feb 8 answered Equivalence of Two Lorentz Groups May 29 answered How find the number of $z$,such that$|a^2-b^2-b+1|\le 10$ May 28 answered Evaluate integral in terms of Gamma function May 24 answered Grover Algorithm Orthogonal vectors Dec 15 answered Fourier transform vs Fourier series Dec 2 answered Kummer's Equation May 23 answered A general pattern to find the roots of the classical lie algebras