Lisa Hefendehl-Hebeker - Vol. 11 Num. 1 (1991) | ||
Negative numbers: obstacles in their evolution from intuitive to intellectual constructs | 26-32 |
for the learning of mathematics
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Lisa Hefendehl-Hebeker - Vol. 11 Num. 1 (1991) | ||
Negative numbers: obstacles in their evolution from intuitive to intellectual constructs | 26-32 |