Outrageously Funny Word Dictionary :: Forbidder

👉 In mathematics, a "forbider" is a mathematical object or function that is not allowed to be applied to an input. For example, in set theory, a forbider is a subset of the power set of a given set. In abstract algebra, it refers to a binary operation on a set that is defined only when both operands are sets and which has no effect on non-set elements. Forbiders can be thought of as "non-allowed" operations or functions in mathematics

forbidder