## An introduction to modern mathematics |

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absolute variable abstract system algebra of sets AnB)nC binary operation called cartesian set commutative group complement composite statements consider construct contains contraposition Corollary of Theorem corresponding deductive defined definition denote describe diagonal direct sum disjoint elements of G empty set enumeration equal equation equivalence relation example expressed f f f f t f fact false finite set geometry give given hatched implies intersection inverse relation mathematical mathematical system mathematician means ment multiplication negation neutral element objects obtain ordered pairs particular points positive integers Postulate primitive terms proof proper subset properties propositional calculus propositional form prove range and image rational integers rational numbers replace result set of positive Similarly specific terms square statement involving suppose symbol symmetric Theorem 8.4 theory tion triangle true proposition unary union universal quantifier variable whose range whence words write