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Oct
13
awarded  Popular Question
Oct
11
comment An unbounded operator is closed if and only if its kernel is closed?
Of course, the scales fall from my eyes.
Oct
2
revised An unbounded operator is closed if and only if its kernel is closed?
added a tag
Oct
2
asked An unbounded operator is closed if and only if its kernel is closed?
Sep
19
asked Symmetry group of product polytope
Sep
15
awarded  Popular Question
Sep
9
comment Can classes in ZFC be identified with logical predicates A(x)?
Thanks for explaining. I explicitly mentioned ZFC, since most mathematicians work with that.
Sep
9
accepted Can classes in ZFC be identified with logical predicates A(x)?
Sep
9
asked Can classes in ZFC be identified with logical predicates A(x)?
Aug
27
answered In a normed vector space, if $O $ is an open set then $ O+a $ is open?
Aug
9
asked Determinant of matrix with unit length rows
Jun
27
awarded  Nice Question
Jun
12
comment Chain morphism into a subcomplex homotopic to identity
@HSN Thank you for pointing out this typo. There is only one subcomplex involved.
Jun
12
revised Chain morphism into a subcomplex homotopic to identity
typo
Jun
12
asked Chain morphism into a subcomplex homotopic to identity
May
27
asked Local estimates for $|(x+\epsilon)^{-1} - x^{-1}|$
May
22
comment Core for an unbounded operator.
Do you know a reference for the domain of $A^\ast A$ being a core of $A$?
May
20
accepted spectral theory of Laplacian on $\mathbb R^n$
May
20
accepted Can you equip every vector space with a Hilbert space structure?
May
20
accepted Fourier transform on fractional Sobolev spaces