linear operator

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• noun mathematics, functional analysis An operator L such that for functions f and g and scalar λ, L (f + g) = L f + L g and L λf = λ L f.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an operator that obeys the distributive law: A(f+g) = Af + Ag (where f and g are functions)