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an_ordinary_mathematician
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1 vote
0 answers
54 views

A question on a paper of B. S. Henriksen

4 votes
1 answer
90 views

Extending a metric in a bi-Lipschitz way

1 vote
0 answers
76 views

Where this function attains its maximum?

3 votes
0 answers
83 views

Beurling's theorem on invariant subspaces

7 votes
3 answers
547 views

A generalization of discrete Hilbert's transform (Montgomery's inequality)

5 votes
1 answer
196 views

A domination property for the Hardy space $H^1$

2 votes
2 answers
374 views

Existence of a bounded right inverse to a linear closed surjective operator

0 votes
0 answers
60 views

Closed graph theorem for cones?

10 votes
1 answer
366 views

Is the spectrum of a "self adjoint" operator real on $\ell^p$?

1 vote
0 answers
76 views

Weak maximum principle for a perturbation of the Laplacian