Number concept Analytische Philosophie 1 Arithmetic 1 Categories (Philosophie) 1 Categories (Philosophy) 1 Child psychology 1 Cognitive psychology 1 Concept de nombre 1 Elementary Mathematics & Arithmetic 1 Frege, Gottlob 1 Frege, Gottlob, 1 Mathematical ability 1 Mathematics 1 Niños 1 Número, Idea de, en el niño 1 Ontologie 1 Ontology 1 Philosophy 1 Piaget, Jean 1 Psicología 1 Psychological aspects 1 Whole and parts (Psychology) 1