Gershgorin circle theorem

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What Wikipedia says

In mathematics, the Gershgorin circle theorem (also called Gershgorin Disk Theorem) may be used to bound the spectrum of a square matrix. It was first published by the Soviet mathematician Semyon Aronovich Gershgorin in 1931.

Excerpt from the Wikipedia article “Gershgorin circle theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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