Thurs March 9 Old business: * groups of order 8: there are 5 different ones. (see "resources" course webpage) * project proposals * RF rubik group: - can you cycle three corners !? - harder than I expected... (I) You can solve the edges without touching the corners. 1 5 2 4 6 3 7 Look at A = (R2F2)3 : exchanges (13)(57) Then B = F A F' does (24)(57). Then C = R A R' does (46)(13) Then B C does (246)(13)(57) and A B C does (246) which cycles 3 edges. Continuing, F ABC F' cycles (136) and likewise R ABC R' cycles (257). * _lots_ of ways to exchange 2 pairs. * some ways to cycle 5. New business: * Have a nice break...