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Dec
24
awarded  Notable Question
Nov
15
comment perturbation by orthogonal projection
the resolvent set of the operator
Nov
14
asked perturbation by orthogonal projection
Nov
14
asked pertubation of an operator by orthogonal projection
Nov
13
comment Properties about Projection
yes, that I mean what's coditions on $G$?
Nov
13
asked Properties about Projection
Jul
2
awarded  Curious
Jun
24
asked Question about a scalar product
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
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
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
Feb
10
revised properties of norms of operators
edited body
Feb
10
comment properties of norms of operators
it is the fractional power of an operator