User Piero D'Ancona - MathOverflow

Piero D'Ancona

Member for 13 years, 9 months
Last seen this week

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Roma

24 Questions

Score Activity Newest Views

23 votes

3 answers

3k views

Trapped rays bouncing between two convex bodies

asked Sep 10, 2010 at 14:00

21 votes

4 answers

2k views

A question on the integral of Hilbert valued functions

asked May 24, 2011 at 12:26

17 votes

4 answers

2k views

An experiment on random matrices

asked Jul 3, 2010 at 10:23

12 votes

1 answer

1k views

Refereeing a paper containing strong statements about other papers

asked Jul 17, 2014 at 10:13

6 votes

1 answer

895 views

A matrix inequality involving the Hilbert-Schmidt norm

asked Dec 10, 2012 at 16:11

11 votes

3 answers

760 views

Notations for dual spaces and dual operators

asked Jan 15, 2017 at 13:04

10 votes

4 answers

748 views

Does a quantitative version of Fredholm theory exist?

asked Sep 30, 2010 at 9:35

9 votes

1 answer

696 views

Counterexamples to weak dispersion for the Schrödinger group

asked Nov 2, 2022 at 8:57

6 votes

1 answer

574 views

A puzzling question on real interpolation

asked Jul 4, 2010 at 9:20

2 votes

0 answers

414 views

Approximating a $C^1$ function in $Lip$ norm with piecewise linear

asked Sep 12, 2016 at 7:38

5 votes

1 answer

279 views

Newtonian potentials of balls and spheres

asked Mar 26, 2023 at 13:55

3 votes

0 answers

245 views

Interior regularity for elliptic operators with non smooth coefficients

asked Apr 22, 2016 at 17:29

6 votes

3 answers

239 views

Stability of the spectrum for perturbations of the boundary

asked Jun 4, 2012 at 17:24

4 votes

1 answer

197 views

Uniform iid sequence

asked Aug 17, 2022 at 18:04

5 votes

1 answer

193 views

Dense subspaces of the Hardy space $H^1$

asked Jun 10, 2022 at 8:57

3 votes

0 answers

160 views

Dual Lorentz spaces

asked Mar 22, 2019 at 17:31

1 vote

1 answer

151 views

$L^p$ estimate for (powers of) a Laplacian with inverse square potential

asked Apr 11, 2014 at 17:51

1 vote

1 answer

145 views

Notation for infinite cartesian products

asked Sep 19, 2022 at 13:49

4 votes

0 answers

133 views

Uniform bound for Bessel functions

asked Mar 30 at 11:36

3 votes

1 answer

121 views

Subharmonic distributions on the plane

asked Mar 24, 2023 at 14:06

3 votes

0 answers

91 views

The numerical range of a composition of two operators

asked Mar 2, 2017 at 10:59

1 vote

1 answer

84 views

Constructive definitions of the Sobolev trace

asked Apr 8, 2018 at 8:47

1 vote

1 answer

77 views

On the definition of symmetric rearrangement

asked Mar 5 at 5:21

2 votes

1 answer

54 views

High order difference operator applied to 1/u

asked Feb 2, 2022 at 12:00