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f ( x ) = School Mathematics Project: 1967 (revised 1970). Advanced Mathematics (Metric), Books 14, Cambridge University Press.
Schwarzenberger, R. L. E. and Tall, D. O.: 1978. Conflict in the learning of real numbers and limits, Mathematics Teaching 82, 449.
Tall, D. O.: l977a. Cognitive conflict and the learning of mathematics, paper presented to the International Group for the Psychology of Mathematics Education, Utrecht, Holland.
Tall, D. O.: 1977b. Conflicts and catastrophes in the learning of mathematics, Mathematical Education for Teaching, 2 4, 218.
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