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How big is an infinite set. Exploration of children’s ideas. Wie gross ist eine unendliche Menge. Eine Untersuchung kindlicher Ideen. (English)
Thirteenth international conference of the International Group on Psychology of Mathematics Education. Vol. 1. Proceedings. 13. internationale Tagung der Gruppe fuer Psychologie und Mathematikunterricht. Bd. 1. Proceedings. International Group for the Psychology of Mathematics Education; Paris-5 Univ., 75 (France). Lab. de Psychologie du Developpement et de l’Education de l’Enfant 1989. p. 252-259 of 290 p. Available from Paris-5 Univ., 75 (France). Lab. de Psychologie du Developpement et de l’Education de l’Enfant. Conference: 13. Annual Conference of the International Group for the Psychology of Mathematics Education (PME), Paris (France), 9-13 Jul 1989
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