Public feed #381237

Someone

public text v1 · immutable
Raw Edit
·published 2007-03-04 18:54 UTC
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x ° y = xy - x - y + 2

(a ° b) ° c = (c ° b) ° a
(ab - a - b + 2) ° c = (cb - c - b + 2) ° a
(ab - a - b + 2)c - (ab - a - b + 2) - c + 2= (cb - c - b + 2)a - (cb - c - b + 2) - a + 2
abc - ac - bc + 2c - ab + a + b - 2 - c + 2= acb - ac - ab + 2a - cb + c + b - 2 - a + 2
0 = 0