Carlo Beenakker
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 Apr 8 comment Quick question on Pauli matrices and u(2) The four complex coefficients of the Pauli matrices provide in total 8 real degrees of freedom, which matches the number of degrees of freedom in the complex $2x2$ matrix. Mar 20 comment Why does this sequence converge to φ? $\phi$ is a fixed-point of your recurrence relation, $\phi=\sqrt{1+\phi}$. Feb 3 answered Zauner's conjecture Feb 3 awarded Yearling Feb 3 answered Asymptotic behavior of a function Jan 27 comment What kind of geometric object is the Pauli spin matrix vector $\vec{\sigma}$? crossposted at mathoverflow.net/questions/229328/… Jan 23 comment Integral involving the gamma function crosslisted at mathoverflow.net/questions/229065/… Nov 9 comment Logarithmic expansion with cosines I added more intermediate steps, is it clear now? Nov 9 revised Logarithmic expansion with cosines added 159 characters in body Nov 8 comment Logarithmic expansion with cosines yep, I couldn't resist :) Nov 8 answered Logarithmic expansion with cosines Jul 23 comment Help with textbook formula en.wikipedia.org/wiki/Multivariate_normal_distribution May 18 answered Clarification on some definitions in Operator Theory Jan 22 comment Definition of mth order stationarity this question is answered here: stats.stackexchange.com/questions/78120/… Sep 24 awarded Autobiographer Jul 13 comment Integer Solutions To Linear Equation khanacademy.org/math/arithmetic/fractions/Equivalent_fractions/… Jun 30 comment Represent an integer as a sum of n non-consecutive squares hmm, does that answer the OP's question for any $n$? Jun 8 comment Heat transfer: boundary conditions with fluid velocity @mkl314 --- perhaps this discussion (on whether the $v\cdot n$ in the boundary condition should be multiplied by $u$ or by $u-u_b$) can be settled by just considering what would happen if you would open a window in your room; there's a draft ($v\cdot n\neq 0$), but the temperature inside and outside is the same ($u=u_b$). Surely one would not expect a temperature gradient to appear? Apr 23 awarded Teacher Apr 22 answered How to get transition matrix of markov process?