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Gershgorin circle theorem

Every eigenvalue of a complex matrix

A = (a_{ij})

lies in at least one disk

{z : ∣ z - a_{ii} ∣ \leq \sum_{j \neq = i} ∣ a_{ij} ∣} .

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- Gershgorin stability bound for a variable-coefficient diffusion stencil Gershgorin circle theorem 50

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