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ACCORDING TO PIAGET ball cardinal number child child's mind consciousness continuous quantities cross-section difference in height differential equations discrete quantities DJAKARTA equal number explanation fact GRONINGEN Hence IDEAS OF NUMBER insight J. B. WOLTERS Jean Piaget KOHNSTAMM en Dr Kohnttamm L. N. H. Bunt larger number latter linearly arranged sets liquid stands logique des classes logistics M. J. LANGEVELD marbles means mentioned multiplication des relations narrow glass natural number Nombre NUMBER AND QUANTITY number of beads number of counters number of glasses number seven observation one-to-one correspondence opinion pay attention poured pouring-over power to multiply propositions protocol given put into one-to-one QUANTITY ACCORDING quantity of liquid quantity of material quantity remains question rapports REDACTlE rela rempli reversi reversibilité second glass shape six counters sort speaks stage succeed suchlike things thinking tion units verse vessel width X X X X X X zijn