User blog comment:Hyp cos/Analysis - BEAF, FGH and SGH (part 3)/@comment-24509095-20140626092059/@comment-25418284-20140627065419

Oh come on, this is Functions 101. In general, f(a) = f(b) does not imply a = b (although the converse is true). If it was true, then consider f(x) = x^2 and f(1) = f(-1), allowing us to conclude that 1 = -1. This is a very basic logical error known as the.