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Jan 14, 2011 at 11:13 vote accept ADL
Dec 24, 2010 at 10:23 answer added user6976 timeline score: 10
Dec 24, 2010 at 0:29 answer added HJRW timeline score: 11
Dec 24, 2010 at 0:10 answer added Bill Thurston timeline score: 20
Dec 23, 2010 at 23:54 comment added HJRW Alan, whoever is responsible for it, `Let $W(X,Y)$ denote a word on the words $X,Y$.' is very unfortunately phrased. The variables X,Y are not words - they may be assigned values which are words!
Dec 23, 2010 at 11:51 history edited ADL CC BY-SA 2.5
HenrikRüping's answer gives conjugate solutions. I originally omitted to mention that I would quite like the solutions to be non-conjugate. I subsequently edited the question to include this.; added 29 characters in body
Dec 23, 2010 at 11:21 history edited ADL CC BY-SA 2.5
deleted 14 characters in body; added 12 characters in body
Dec 23, 2010 at 11:11 comment added ADL @Denis Serre: With respect to your edit, I did mean words and not letters. A and B are words, not necessarily letters, so giving the definition of W(x, y) in terms of letters doesn't make sense...
Dec 23, 2010 at 10:37 history edited Denis Serre CC BY-SA 2.5
added 2 characters in body
Dec 23, 2010 at 9:24 history asked ADL CC BY-SA 2.5