Vol. 9 Num. 3 (1989) Michael Neubrand Remarks on the acceptance of proofs: the case of some recently tackled major theorems2 Susan Pirie , Thomas Kieren A recursive theory of mathematical understanding7 Jan van den Brink Transference of objects12 Paolo Boero , Pier Luigi Ferrari , Enrica Ferrero Division problems: meanings and procedures in the transition to a written algorithm17 John Clement , Clifford Konold Fostering basic problem-solving skills in mathematics26 Colette Laborde Audacity and reason: French research in mathematics education31 David Tall Concept images, generic organizers, computers, and curriculum change37