Spectrum (linear operator)/Definition

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https://en.citizendium.org/wiki/index.php?title=Spectrum_(linear_operator)/Definition&printable=yes
A definition or brief description of Spectrum (linear operator).

A set of values {λ} characteristic of an operator O mapping a Banach space into itself such that O xλ = λ xλ for some nonzero vectors xλ.

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