| Greisy Winicki-Landman - Vol. 20 Num. 1 (2000) | ||
| On equivalent and non-equivalent definitions: part 1 | 17-21 | |
| Greisy Winicki-Landman - Vol. 20 Num. 2 (2000) | ||
| On equivalent and non-equivalent definitions: part 2 | 24-29 | |
for the learning of mathematics
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