Minimum about fuzzy logic
Fuzzy generalization of negation – fuzzy NOT

As a generalization of fuzzy negation, the one’s complement is most commonly used (in applications almost exclusively)

NOT a = 1 – a

Other works mention, for example, Sugeno class of complements

NOTλ a = (1 - a)/(1 - λa) for the parameter λ in the interval (-1, ∞)

or Yager class of negations

NOTw a = (1 - aw)1/w