List questions from spectral-theory

Published on 09 Apr 2026 - 3:56

48

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What will be $\partial K\ $?

Published on 01 Apr 2026 - 12:22

72

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The image of a Fredholm operator under an isomorphism : did the index still the same?

Published on 10 Sep 2021 - 14:00

152

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Do Laplace-Beltrami eigenfunctions vary continuously with the metric?

Published on 28 Mar 2026 - 17:41

117

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Finding the spectrum of a linear operator on $\mathscr{C} \left[ 0, 1 \right]$

Published on 11 Sep 2021 - 16:13

61

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Finding spectrum of a linear operator on $\ell^{\infty}$

Published on 11 Sep 2021 - 16:32

72

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Why is operator $P = - i \frac{d}{dx} $ self-adjoint in this domain?

Published on 27 Mar 2026 - 5:39

332

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Perturbation of the spectrum

Published on 29 Mar 2026 - 16:02

56

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Possible reverse triangle inequality

Published on 09 Apr 2026 - 6:12

131

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Numerical range of a symmetric positive matrix as an operator acting on Hilbert space

Published on 14 Sep 2021 - 20:01

66

Views

Essential spectrum of a product of self-adjoint operators which have positive essential spectrum

Published on 15 Sep 2021 - 19:13

63

Views

Conditions for a Sequence to be the Eigenvalues of a Laplacian

Published on 02 Apr 2026 - 3:53

52

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If a self-adjoint operator has a mixed spectrum, is it necessarily bounded from below?

Published on 19 Sep 2021 - 20:12

75

Views

Why is the Cauchy integral formula better than the power series representation?

Published on 01 Apr 2026 - 14:02

69

Views

Eigen values of translation operators in $L^p$ spaces.

Published on 28 Sep 2021 - 16:25

List Question

Convergence of self-adjoint operator in norm resolvent sense

What will be $\partial K\ $?

The image of a Fredholm operator under an isomorphism : did the index still the same?

Do Laplace-Beltrami eigenfunctions vary continuously with the metric?

Finding the spectrum of a linear operator on $\mathscr{C} \left[ 0, 1 \right]$

Finding spectrum of a linear operator on $\ell^{\infty}$

Why is operator $P = - i \frac{d}{dx} $ self-adjoint in this domain?

Perturbation of the spectrum

Possible reverse triangle inequality

Numerical range of a symmetric positive matrix as an operator acting on Hilbert space

Essential spectrum of a product of self-adjoint operators which have positive essential spectrum

Conditions for a Sequence to be the Eigenvalues of a Laplacian

If a self-adjoint operator has a mixed spectrum, is it necessarily bounded from below?

Why is the Cauchy integral formula better than the power series representation?

Eigen values of translation operators in $L^p$ spaces.

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