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The first handheld graphing calculator, the Casio fx-7000G, appeared in 1985. Since then, graphing calculators have become a common – and controversial – tool for learning mathematics.
Manav Das, Sze-Man Ngai, Graph-directed Iterated Function Systems with Overlaps, Indiana University Mathematics Journal, Vol. 53, No. 1 (2004), pp. 109-134 ...
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