In Ernest Freese's diagrams (from the 1950's), which I got access to late in 2002, there is a diagram of the same 12-piece dissection of three hexagrams to one that Harry Lindgren published in 1964. Thus the right two thirds of Figure 17.11 were discovered independently by Ernest Freese and by Harry Lindgren. Apparently, neither man realized that the dissection is hingeable.
Copyright 2003, Greg N. Frederickson.
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Last updated January 17, 2003.