Apparently, this user prefers to keep an air of mystery about them.
2 minimum value of a trigonometric equation is given. the problem is when the minimum value attains jun 12 '13
1 Let $A$, $B$ be positive operators in a Hilbert space and $\langle Ax,x \rangle=\langle Bx,x \rangle$ for all $x$, show that $A=B$ may 21 '13
1 Under what condition, $n(>2)$ non-zero vectors of equal length forms a regular n-gon in Euclidean plane jun 12 '13
0 Give an example of a spanning set of $\ell^2(N)$ which is also a Bessel sequence but not a frame for $\ell^2(N)$ jun 17 '14
0 A subgroup containing a kernel of a group homomorphism into an abelian group is a normal subgroup. jun 12 '13