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Principia Mathematica
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=== Primitive ideas === Cf. ''PM'' 1962:90β94, for the first edition: * (1) ''Elementary propositions''. * (2) ''Elementary propositions of functions''. * (3) ''Assertion'': introduces the notions of "truth" and "falsity". * (4) ''Assertion of a propositional function''. * (5) ''Negation'': "If ''p'' is any proposition, the proposition "not-''p''", or "''p'' is false," will be represented by "~''p''" ". * (6) ''Disjunction'': "If ''p'' and ''q'' are any propositions, the proposition "''p'' or ''q'', i.e., "either ''p'' is true or ''q'' is true," where the alternatives are to be not mutually exclusive, will be represented by "''p'' β¨ ''q''" ". * (cf. section B)
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