User Pedro Lauridsen Ribeiro

25 votes

1 answer

2k views

Generalized geometry and spin structures

asked Nov 30, 2010 at 21:41

17 votes

0 answers

1k views

Jets of sections of vector bundles expressed by symmetrized iterated covariant derivatives - who did it first?

asked Jun 3, 2016 at 5:30

11 votes

4 answers

668 views

Is every non-negative test function the limit of a sequence of sums of squares of test functions?

asked Dec 22, 2017 at 23:52

10 votes

0 answers

464 views

Reference for sets of locally finite perimeter on Riemannian manifolds

asked Aug 6, 2020 at 18:44

8 votes

2 answers

361 views

Can smoothness of curves into a convenient locally convex vector space be tested with just a dense subspace of the dual?

asked Dec 11, 2018 at 3:48

8 votes

2 answers

644 views

In which sense are Euler-Lagrange PDE's on fiber bundles quasi-linear?

asked Jun 29, 2017 at 3:32

7 votes

1 answer

626 views

Upper bound on the number of convex connected components of the complement of the zero set of a polynomial

asked Feb 9, 2016 at 18:44

7 votes

1 answer

669 views

A very basic question about projections in formal PDE theory

asked Jun 28, 2017 at 22:03

5 votes

2 answers

242 views

Extension of Valdivia-Vogt isomorphism from $\mathscr{D}(K)$ to $\mathscr{E}'(K)$

asked Jan 18, 2019 at 3:34

5 votes

2 answers

674 views

Is every Montel locally convex vector space compactly generated?

asked Oct 14, 2014 at 20:51

4 votes

1 answer

486 views

Decay estimates for wave and Klein-Gordon equation in "generic" curved backgrounds

asked Jun 22, 2016 at 2:17

2 votes

0 answers

35 views

Is -1 a sum of Hermitian squares in associative *-envelopes of formally real Jordan algebras?

asked Aug 20, 2017 at 7:06

2 votes

1 answer

609 views

Stein's extension operator and wave front sets

asked Sep 2, 2011 at 2:07

1 vote

1 answer

318 views

Uniformly continuous functions and Borel hierarchy in the compact-open topology

asked May 3, 2012 at 22:54

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14 Questions

Generalized geometry and spin structures

Jets of sections of vector bundles expressed by symmetrized iterated covariant derivatives - who did it first?

Is every non-negative test function the limit of a sequence of sums of squares of test functions?

Reference for sets of locally finite perimeter on Riemannian manifolds

Can smoothness of curves into a convenient locally convex vector space be tested with just a dense subspace of the dual?

In which sense are Euler-Lagrange PDE's on fiber bundles quasi-linear?

Upper bound on the number of convex connected components of the complement of the zero set of a polynomial

A very basic question about projections in formal PDE theory

Extension of Valdivia-Vogt isomorphism from $\mathscr{D}(K)$ to $\mathscr{E}'(K)$

Is every Montel locally convex vector space compactly generated?

Decay estimates for wave and Klein-Gordon equation in "generic" curved backgrounds

Is -1 a sum of Hermitian squares in associative *-envelopes of formally real Jordan algebras?

Stein's extension operator and wave front sets

Uniformly continuous functions and Borel hierarchy in the compact-open topology