## Logic and psychology |

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### Contents

Psychological Development of Operations | 8 |

Operational Structures of the Algebra of | 23 |

The Psychological Meaning | 38 |

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### Common terms and phrases

abstract algebra actions algebra of logic algebraic structures appear 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 formalized logic group INRC groupements of classes hypothesis inclusion inverse lattice lattice theory level of concrete liquid logic of propositions logical operations logical relationships logical structures logicians mathematical mechanical equilibrium mental ments multiplicative groupement objects opera operational mechanisms operational schemata operational structures operations of classes Paris P.U.F. perceptual period Piaget and Inhelder possible pre-operational presupposes problem proportions propositional logic propositional operations Propositional structures reciprocal resultant reversi reversibility semi-lattice sensori-motor seriation simple single system structure of propositional structured wholes sub-sets symbolic logic system of propositional Tautology ternary operations tions Traite de logique transformations transitive relation Venfant vertebrates Vienna Circle weight whilst