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→Formal definition: This section uses jargon in such a way that it's hard for a typical reader to understand
==Formal definition==
==Formal definition==
An '''operator''' is a map from function space to function space. If the range of an operator is on the [[real line]] or in the [[complex plane]], the operator is usually called a [[functional operator|functional]] instead.
{{jargon}}
An '''operator''' is a map from [[function space]] to function space. If the range of an operator is on the [[real line]] or in the [[complex plane]], the operator is usually called a [[functional operator|functional]] instead.
[[category:mathematics]]
[[category:mathematics]]