Fuzzy logic

Fuzzy logic differs from two-digit classical logic in that it allows a continuous number of truth values for statements. Most often, these values belong to the segment [0,1] of real numbers. In fuzzy logic, there are innumerable intermediate truth values between 0, which corresponds to the classic “false” and 1, or “true”.

Modal logic is based on the logic of statements by adding new signs that allow you to Express the relationship of certain statements to the surrounding reality. The purpose of various systems of modal logic is to include in logic so-called modalities - first of all, necessities and possibilities: what "should be" and what "might be".

Classical logic deals with statements that assert the presence or absence of a particular situation. However, in life you have to deal with statements that contain an indication of necessity.