Main

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4

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review version

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html import

20 (imported)

Events

first seen date

2024-10-17 05:59:58

expired found date

-

created at

2024-10-17 05:59:57

updated at

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Server

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mp rejected date

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Open Graph

title

Disquisitiones Mathematicae

description

Matheus' Weblog

image

site name

Disquisitiones Mathematicae

author

updated

2026-03-02 10:30:38

raw text

Disquisitiones Mathematicae | Matheus’ Weblog Disquisitiones Mathematicae Matheus’ Weblog  Posted by: matheuscmss | May 3, 2021 Spectral rigidity of almost circular ellipses (after Hezari–Zelditch) In 1966, M. Kac wrote a famous article asking whether  Can one hear the shape of drum? : mathematically speaking, one wants to reconstruct (up to isometries) a domain from the knowledge of the spectrum of its Laplacian. In his article, M. Kac showed that one can hear the shape of a disk because of the following two facts: the area and the perimeter of a smooth domain are determined by the eigenvalues of its Laplacian via the asymptotics of the  trace of the heat operator : the  isoperimetric inequality  says that we can recognise the disk from its perimeter and area: indeed, any smooth domain satisfies , and the equality holds if and only if is isometric to a disk of radius . (In particular, a smooth domain with the same Laplace eigenvalues of has a...

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