New posts in Hilbert Spaces

Representation theorem for quadratic form on Hilbert space

Do all unitary representations weakly converge to zero at infinity?

Finite-dimensional Hilbert $C^*$-modules

Non-standard tensor products of inner product spaces

Is the set of separable quantum states closed?

Unbounded Fredholms operators

Does a random sequence of vectors span a Hilbert space?

Multiple of identity plus compact

$x f'$ bounded by $x^2f $ and $f''$?

When are the closed convex subsets countable intersections of halfspaces