Stanford Encyclopedia of Philosophy A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z Relevance Logic Relevance logics are non-classical logics. Called relevance logics in North America and relevant logics in Britain and Australasia, these systems developed as attempts to avoid the paradoxes of material and strict implication. Among the ...