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abstract algebra actions algebra of logic algebraic structures axiomatic logic behaviour Bertrand Russell binatorial Boolean algebra calculus character child classes and relations classification combinations combinatorial system Conception of Number concrete operations construction coordinate correlate deductive elementary groupements elements example experience experimental fact field form of equilibrium formalized logic group INRC groupements of classes hypothesis I'enfant inclusion inverse lattice lattice theory level of concrete liquid logic and psychology logic of propositions logical operations logical relationships logical structures logicians mathematical mechanical equilibrium mental ments multiplicative groupement negation objects opera operational mechanisms operational schemata operational structures p-q v p-q Paris P.U.F. perceptual possible pre-operational presupposes problem proportions propositional logic propositional operations reciprocal resultant reversi reversibility semi-lattice sensori-motor serial seriation single system structure of propositional structured wholes sub-sets symbolic logic system of propositional Tautology ternary operations tions Traite de logique transformations transitive relation vertebrates Vienna Circle weight whilst