 Goguen (1969) and Zadeh (1975), on the other hand, suggest replacing classical two-valued logic with an infinite-valued one. Hyde (2008) also adopts this approach, though the infinite-valued semantics is considered a purely formal device and not a commitment to degrees of truth (see Cook 2002 in this connection). Infinite-valued or fuzzy logics (see the entry on fuzzy logic) have, however, also been promoted precisely for their recognition of degrees of truth. Just as baldness comes in degrees so too, it is argued, does the truth of sentences predicating baldness of things. The fact that John is more bald than Jo is reflected in the sentence ‘John is bald’ having a higher degree of truth than ‘Jo is bald’. Smith (2008) advocates a fuzzy logic for just this reason.