In late June 1995 I began teaching geometry and trigonometry to David Goldenheim and Daniel Litchfield at Greens Farms Academy's summer session. Their reputation in mathematics had reached my ears long before I worked with them, so I was prepared for a fascinating and challenging time. I had. however, no idea of the adventure on which we were to embark.
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Litchfield et al. (1997) studied this question.