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2d
asked About distributions
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
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