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 Mar 6 awarded Notable Question Aug 29 accepted power series expansion of the square root of a Hermitian matrix Aug 28 comment power series expansion of the square root of a Hermitian matrix How is the condition $2I-c^{-1}H\ge 0$ analogous to the condition $x=0$ for $x=I-c^{-1}H$? Aug 27 comment power series expansion of the square root of a Hermitian matrix You are rather using the expansion of $\sqrt x=\sqrt{1-(1-x)}$ near $x=0$ which is very slowly converging, aren't you? Aug 26 awarded Popular Question Feb 19 awarded Popular Question Jul 2 awarded Curious Jan 3 comment Looking for the functions $\alpha_n(x)$ that satisfy $\sum_{n=0}^{\infty} e^{i \alpha_n(x)}\frac{H_n(x)}{\sqrt{2^n n!}}=0$ @Mr.G The question focuses on real $\alpha_n(x)$, but I would be interested if you can find complex ones! Dec 28 awarded Promoter Dec 27 revised Looking for the functions $\alpha_n(x)$ that satisfy $\sum_{n=0}^{\infty} e^{i \alpha_n(x)}\frac{H_n(x)}{\sqrt{2^n n!}}=0$ deleted 2 characters in body Dec 26 comment Looking for the functions $\alpha_n(x)$ that satisfy $\sum_{n=0}^{\infty} e^{i \alpha_n(x)}\frac{H_n(x)}{\sqrt{2^n n!}}=0$ @IgorRivin Any of them. Dec 26 asked Looking for the functions $\alpha_n(x)$ that satisfy $\sum_{n=0}^{\infty} e^{i \alpha_n(x)}\frac{H_n(x)}{\sqrt{2^n n!}}=0$ Nov 3 comment Constrained variational calculus: Are we allowed to make use of the constraint before taking variations? @OccupyGezi Will there be any need for using Lagrange multiplier after imposing the constraint? Nov 3 asked Functions generating prime numbers in math packages Oct 27 awarded Popular Question Sep 21 answered Geometric meaning of block-diagonalization of a matrix Apr 14 revised Constrained variational calculus: Are we allowed to make use of the constraint before taking variations? added 79 characters in body Apr 14 asked Constrained variational calculus: Are we allowed to make use of the constraint before taking variations? Apr 9 comment differential equation of the square root of a matrix I am wondering why the trajectory lies in the commutant of the algebra generated by A and B. Consider $M(dt)$ where $dt$ is an infinitismal time step. $M(dt)=M(0)+A.M(0).B.dt$ why does this commute with $A$ and $B$ if $M(0)$ does ? Apr 7 asked differential equation of the square root of a matrix