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| Educational Studies in… | 1 |
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| Blum, Werner | 1 |
| Kirsch, Arnold | 1 |
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Peer reviewedBlum, Werner; Kirsch, Arnold – Educational Studies in Mathematics, 1991
Developed is a working definition of the concept of preformal proof through the analyses of an action proof, a geometric-intuitive proof, and a reality-oriented proof of a differential equation. Instructional problems for teachers and learners in connection with preformal proofs are pointed out. (MDH)
Descriptors: Calculus, Differential Equations, Learning Strategies, Mathematical Logic
