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May
20
revised Free groups of rotations of the sphere
added 49 characters in body
Mar
14
revised Prove that every outer planar graph is $3$-choosable
added 408 characters in body
Mar
8
revised Worst case in decanting puzzles (pouring water from one jug to others).
I forgot that I had made the assumption that A0+B0+C0 is at most A, where A0, etc is the initial state.
Feb
17
revised Banach Tarski — any demonstration?
added comments about the cited visualization of BTParadox on the WRI cite.
Dec
16
revised free group generated by polynomials
added 284 characters in body
Feb
9
revised Why can a Venn diagram for 4+ sets not be constructed using circles?
added 20 characters in body