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An '''operator''' is a [[mapping]] from [[function space]] to function space.  If the [[range]] of the operator is on the [[real line]] or in the [[complex plane]], the operator is usually called a [[function]]al instead. The most commonly used operators in mathematics are [[binary operator]]s.

An '''operator''' is a [[mapping]] from [[function space]] to function space.  If the [[range]] of the operator is on the [[real line]] or in the [[complex plane]], the operator is usually called a [[functional]] instead. The most commonly used operators in mathematics are [[binary operator]]s.

An '''operator''' is also a person who makes phone connections, though this practice is becoming less common as the process becomes more automated.

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

More generally, an '''operator''' can refer to anyone who operates heavy or complicated [[machinery]]. Examples: [[forklift]] operator, [[radar]] operator, [[system]] operator ([[sysop]]).

More generally, an '''operator''' can refer to anyone who operates heavy or complicated [[machinery]]. Examples: [[forklift]] operator, [[radar]] operator, [[system]] operator ([[sysop]]).