[1] A modus ponens rule is in the form In crisp logic, the premise x is A can only be true or false.
[2] This is achieved by representing the linguistic variables A and B using fuzzy sets.
Rules can connect multiple variables through fuzzy set operations using t-norms and t-conorms.
[3][4][5] For example, The degree of truth assigned to temperature is hot and to humidity is high.
T-conorms are less commonly used as rules can be represented by AND and OR connectors exclusively.