User Pedro Lauridsen Ribeiro

9 votes

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Is there, mathematically speaking, a QFT with the following properties?

answered Dec 6, 2023 at 5:49

8 votes

Separate continuity implies (joint) continuity

answered Feb 16, 2023 at 0:32

8 votes

Topology on Minkowski space $\mathbb{R}^{4}$ and Lorentz invariant measure

answered Mar 4, 2021 at 14:55

8 votes

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Hamilton equations for Classical Field Theory

answered Feb 1, 2021 at 21:44

8 votes

Applications of functional analysis beyond analysis(towards algebra, geometry, number theory...)

answered Apr 6, 2016 at 5:50

7 votes

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Constant rank theorem for Banach spaces

answered Apr 30, 2015 at 18:16

7 votes

Lie-derivative of tensor field along tensor field

answered Jan 28, 2014 at 19:22

7 votes

Wavelet-like Schauder basis for standard spaces of test functions?

answered Jul 6, 2016 at 0:55

7 votes

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For a tempered distribution $F$ on $\mathbb{R}^2$, what exactly does it mean by $\lvert F(x,y) \rvert \leq \lvert x-y \rvert^{-n}$?

answered Mar 8 at 18:55

6 votes

Does summing divergent series using cutoff functions give consistent results?

answered Jan 2 at 4:20

6 votes

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Integrals of pullbacks and the Inverse function theorem(s?)

answered Feb 16, 2015 at 17:54

5 votes

Wave front set from the FBI or Segal-Bergman transform (and a motivation)

answered Jul 11, 2015 at 15:22

5 votes

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Singular support: equivalent definition

answered Apr 16, 2023 at 18:06

5 votes

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Let $f$ be convex and $A$ a Borel subset of $\mathbb R^d$ on which $f$ is differentiable. Is the gradient $\nabla f: A \to \mathbb R^d$ measurable?

answered Jul 1, 2022 at 3:29

5 votes

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Simple existence and uniqueness for second order and linear elliptic PDE

answered Nov 18, 2019 at 22:13

5 votes

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Regularity of Fourier transforms of $L^p$ functions for $2<p\le\infty$

answered Jan 9, 2018 at 20:25

5 votes

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Wick product of free fields and wave front sets in the sense of Lars Hörmander

answered Apr 9 at 7:53

4 votes

Is every closed subspace of the Schwartz space densely embedded into its dual space?

answered May 7 at 23:53

4 votes

Quantum fields and infinite tensor products

answered Jan 13, 2021 at 21:07

4 votes

What are some examples of narrowly missed discoveries in the history of mathematics?

answered Sep 23, 2016 at 1:04

4 votes

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Is every continuous microlocal operator a pseudo-differential operator?

answered Jan 5, 2018 at 5:56

4 votes

Reference request for a treatment of Schwinger–Dyson equations

answered Jan 7, 2018 at 2:32

4 votes

What properties should $C(M,\mathbb{R})$ have when $M$ is a $n$-dimensional manifold?

answered Jun 30, 2021 at 20:56

4 votes

Learning roadmap for Lorentzian geometry

answered May 26, 2021 at 15:04

4 votes

Positive Elements of a $\ast$-Algebra

answered Sep 3, 2015 at 20:09

4 votes

Nonseparable disintegration theory: references

answered Apr 27, 2013 at 4:52

3 votes

Fourier Transforms restricted to mass shell

answered Sep 7, 2011 at 23:47

3 votes

Good Books on the history of Zero

answered Aug 8, 2013 at 21:20

3 votes

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Critical case of Sobolev Embedding

answered Jun 15, 2016 at 6:00

3 votes

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Unitary representations of SO(1,4) and SO(2,3)

answered Jun 15, 2016 at 16:18

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90 Answers

Is there, mathematically speaking, a QFT with the following properties?

Separate continuity implies (joint) continuity

Topology on Minkowski space $\mathbb{R}^{4}$ and Lorentz invariant measure

Hamilton equations for Classical Field Theory

Applications of functional analysis beyond analysis(towards algebra, geometry, number theory...)

Constant rank theorem for Banach spaces

Lie-derivative of tensor field along tensor field

Wavelet-like Schauder basis for standard spaces of test functions?

For a tempered distribution $F$ on $\mathbb{R}^2$, what exactly does it mean by $\lvert F(x,y) \rvert \leq \lvert x-y \rvert^{-n}$?

Does summing divergent series using cutoff functions give consistent results?

Integrals of pullbacks and the Inverse function theorem(s?)

Wave front set from the FBI or Segal-Bergman transform (and a motivation)

Singular support: equivalent definition

Let $f$ be convex and $A$ a Borel subset of $\mathbb R^d$ on which $f$ is differentiable. Is the gradient $\nabla f: A \to \mathbb R^d$ measurable?

Simple existence and uniqueness for second order and linear elliptic PDE

Regularity of Fourier transforms of $L^p$ functions for $2<p\le\infty$

Wick product of free fields and wave front sets in the sense of Lars Hörmander

Is every closed subspace of the Schwartz space densely embedded into its dual space?

Quantum fields and infinite tensor products

What are some examples of narrowly missed discoveries in the history of mathematics?

Is every continuous microlocal operator a pseudo-differential operator?

Reference request for a treatment of Schwinger–Dyson equations

What properties should $C(M,\mathbb{R})$ have when $M$ is a $n$-dimensional manifold?

Learning roadmap for Lorentzian geometry

Positive Elements of a $\ast$-Algebra

Nonseparable disintegration theory: references

Fourier Transforms restricted to mass shell

Good Books on the history of Zero

Critical case of Sobolev Embedding

Unitary representations of SO(1,4) and SO(2,3)