$15 - $75
Quantities around a point.
Showing that three, four and five equal triangles produce a solid corner, whereas six produce a flat surface . . . .
. . . .and tomorrow I will enter Hyperbolic Space!
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Here are some of the ideas that I have been exploring.
Please let me
know if there's anything you want to correct/find interesting/would like
a copy of - or to purchase/participate in etc.