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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]] instead.
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]] instead.
An operator is also a person who makes phone connections, though this practice is becoming less common as the process becomes more automated.
[[category:mathematics]]
[[category:mathematics]]