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visits member for 2 years, 2 months
seen Jul 3 at 12:31

Jul
2
awarded  Curious
Jun
24
asked Question about a scalar product
May
9
asked about analytic operator valued function
May
2
asked Comparison of subsets of spectrum
Apr
26
asked about spectrum of the sum of two operators
Apr
25
revised A primitive of special function
added 2 characters in body
Apr
25
asked A primitive of special function
Apr
23
comment stability of essential spectra
But I haven't understand why I can do it?
Apr
23
asked stability of essential spectra
Apr
7
asked Integral's limit
Mar
31
asked about limits calculus
Mar
30
comment About inverse of an operator
and if $\eta(.)\in L^{\infty}(-1,1)$ is an arbitrary non zero function, what's the inverse of this operator?
Mar
29
asked About inverse of an operator
Mar
27
asked about resolvent of a self-adjoint operator
Mar
21
asked Operator's comparison
Mar
7
asked Comparison of operators
Feb
15
comment Resolvent's estimation.
this result is it true for noramal operators?
Feb
13
revised Spectrum of perturbed operator's
added 27 characters in body
Feb
13
comment Spectrum of perturbed operator's
If $\{\lambda_n\}$ are the eigenvalues of $G$, can we have $\lambda_{n}(G)\sim \lambda_{n}(G+P)$?
Feb
13
asked Spectrum of perturbed operator's