 These three truth-functions yield the original semantics of fuzzy logic proposed by Joseph Goguen (1975), later studied formally by, e.g., Gehrke, Walker, &amp; Walker (1997). Many researchers still refer to it as “the fuzzy logic”. However it has soon become apparent that this semantic framework is too poor to (1) encode/model numerous interesting aspects of reasoning and (2) to support a fully fledged theory of mathematical logic. 