User Christian Remling

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Schrödinger operator with Coulomb potential

answered Aug 31, 2018 at 16:28

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A certain operator on integer sequences

answered Sep 16, 2017 at 18:05

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Gronwall's inequality for higher order derivatives

answered Nov 18, 2017 at 0:33

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Finding the asymptotic bound of a summation

answered Aug 9, 2017 at 2:08

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Can we conclude a subspace is Invariant by using circular convolution?

answered Aug 15, 2017 at 7:33

5 votes

Solve $\inf_{ X: |X| \le a \text{ a.s.}} E \left[ \frac{1}{1+(X-X^\prime)^2} \right] $

answered Sep 9, 2017 at 17:15

5 votes

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Continuous semigroup homomorphism of composition to additive structure

answered Nov 16, 2019 at 23:01

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Existence of probability measure on the circle with given Fourier coefficients

answered Aug 20, 2020 at 0:56

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Does $L^2$ convergence and convergence on a countable dense subset, together imply almost everywhere convergence?

answered Jan 23, 2021 at 15:40

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Approximation rate of $L^2$ function by piecewise constant functions

answered Aug 10, 2016 at 17:08

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Separability of $L^1$ in $L^2$ topology

answered Dec 2, 2016 at 19:07

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Birman-Schwinger Principle

answered Dec 14, 2016 at 4:58

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Inverted harmonic oscillator

answered Dec 27, 2016 at 4:19

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Ground state for a double well potential (Schrödinger)

answered Jun 3, 2017 at 0:25

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Sequential addition of points on a circle, optimizing asymptotic packing radius

answered Jul 11, 2017 at 18:44

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Alternating power series $\sum_{k\geq 0}(-1)^k z^{(2k+1)^2}$

answered Jun 10, 2017 at 1:28

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Uniform bound for an oscillatory sum

answered May 22, 2017 at 23:03

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Minimum of squared sum minus sum of squares

answered May 14, 2015 at 23:59

5 votes

Division and multiplication that preserve Euclidean norms

answered Dec 26, 2015 at 18:26

5 votes

If a polynomial $p(z)$ omits a value, then $p(z)-\dfrac{(1-e^{i\psi})}{n}zp^{\prime}(z)$ also omits that value

answered Mar 24, 2015 at 0:57

5 votes

Pairwise dependent random walk recurrent

answered Jul 25, 2014 at 23:41

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An inequality concerning convexity and expectation

answered Jul 26, 2014 at 2:48

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Linear transformation of a polyhedron

answered Jun 29, 2014 at 7:24

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Multivariable monotonic function

answered Jun 5, 2014 at 5:38

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Results of invertibility of a matrix involving the Szego kernel

answered Apr 13 at 15:48

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Can the Chebyshev polynomials be constructed from the extremal property?

answered Apr 5 at 18:07

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Permutation of a mixture of (anti)commuting variables and consistency issue regarding the sign

answered Feb 19 at 17:25

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Can every $L^p$ function be written as the weak derivative of a Sobolev function?

answered Dec 25, 2023 at 20:23

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Eigenvalues of a Schrödinger operator

answered Jan 14 at 16:56

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Unitary versus isometric operators

answered Jan 16 at 15:10

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441 Answers

Schrödinger operator with Coulomb potential

A certain operator on integer sequences

Gronwall's inequality for higher order derivatives

Finding the asymptotic bound of a summation

Can we conclude a subspace is Invariant by using circular convolution?

Solve $\inf_{ X: |X| \le a \text{ a.s.}} E \left[ \frac{1}{1+(X-X^\prime)^2} \right] $

Continuous semigroup homomorphism of composition to additive structure

Existence of probability measure on the circle with given Fourier coefficients

Does $L^2$ convergence and convergence on a countable dense subset, together imply almost everywhere convergence?

Approximation rate of $L^2$ function by piecewise constant functions

Separability of $L^1$ in $L^2$ topology

Birman-Schwinger Principle

Inverted harmonic oscillator

Ground state for a double well potential (Schrödinger)

Sequential addition of points on a circle, optimizing asymptotic packing radius

Alternating power series $\sum_{k\geq 0}(-1)^k z^{(2k+1)^2}$

Uniform bound for an oscillatory sum

Minimum of squared sum minus sum of squares

Division and multiplication that preserve Euclidean norms

If a polynomial $p(z)$ omits a value, then $p(z)-\dfrac{(1-e^{i\psi})}{n}zp^{\prime}(z)$ also omits that value

Pairwise dependent random walk recurrent

An inequality concerning convexity and expectation

Linear transformation of a polyhedron

Multivariable monotonic function

Results of invertibility of a matrix involving the Szego kernel

Can the Chebyshev polynomials be constructed from the extremal property?

Permutation of a mixture of (anti)commuting variables and consistency issue regarding the sign

Can every $L^p$ function be written as the weak derivative of a Sobolev function?

Eigenvalues of a Schrödinger operator

Unitary versus isometric operators