汎はん関かん数すう

noun

functional

A mathematical term for a function whose input is a function and whose output is a scalar. Used in fields such as functional analysis and calculus of variations.

• 汎はん関かん数すうは、関かん数すうを引ひき数すうにとり実じつ数すう値ちを返かえす写しゃ像ぞうである。

  A functional is a mapping that takes a function as an argument and returns a real number.