. . . . "functional analytic" . . . . . . . . . . "Functional Analysis" . . . . . . "functional-analytic" . "Functional analysis" . . "Nonlinear functional analysis" . . . . . . . . . . . "functional" . . . . "Functional analysis" . . . . "functional analytic methods" . . . . . . . . . . . . . . "analytical method" . . . . "applied functional analysis" . "functional analysis" . "infinite dimensional" . . . . . "spaces of functions" . . . . . . "functional tools" . . "Applied functional analysis" . . . . . . . "mathematical theory of such operators" . . . . "Functional" . . "functional analyst" . . . . . . "functional analysts" . . . "vectors" . "algebraic function theory" . . . . . . . . "analysis" . . . . . . . "Linear functional analysis" . "General analysis" . . . . .