Fernando Rodriguez Villegas
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puzzles
With colleagues L. Sadun and F. Voloch we analized our own puzzle Blet. It is sort of remarkable how such a fairly simple puzzle is connected to interesting mathematics (SL_2, universal covers, braid groups).Here is a Tcl version written by F. Voloch. (Blet logo created at puzzles.com .) The puzzle arose from my work with B. Poonen. Check also the course Math, Puzzles and Computers.