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AbstractLetWe prove that ifWe show that α is injective ifThe arguments and results extend easily from two variables to any set of variables.The article concludes with some results contributed by G. M. Bergman that describe situations where α is not injective. He shows that ifdoi:10.1515/forum-2012-0170 fatcat:kystbry3c5h6hpzxs4m4w56knm