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fa.practical evaluation – Is it workable to categorise nonclosed subspaces of Hilbert’s house?
Let $H$ breathe Hilbert’s house.
Motivated by my earlier query about wildly discontinuous linear functionals, which can breathe interpreted as an try to classify dense hyperplanes in $H$, let me now refer straight to the purpose:
Questions.

Are there any important variations amongst dense hyperplanes in $H$?

If $L$ and $M$ are two dense hyperplanes in $H$, is there a unitary operator mapping $L$ to $M$?

Assuming the respond to (2) is traverse, what number of orbits are there for the
unaffected motion of the unitary group $mathscr U(H)$ on the clique of dense hyperplanes?
Speaking about common (not essentially closed or dense) subspaces of $H$, there are some things one could say in that
respect.
For instance, not all such areas could breathe described because the meander of a bounded operator and, specifically, no
dense hyperplane qualifies. This is as a result of, if the meander of such an operator has finite codimension, it should breathe
closed (this follows simply from the Closed Graph Theorem).
The meander of a compact operator doesn’t acquire any innumerable dimensional closed subspace, so that’s one other property one might employ
to categorise subspaces.
More Questions.

Is there a needful and adequate situation, expressed in topological/analytical phrases, characterizing the meander of
a bounded (resp. compact) operator amongst all subspaces of $H$? 
How many unitary equivalence lessons of nonclosed subspaces of $H$ are there? How many of those could breathe described in
topological/analytical phrases?
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