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Published online by Cambridge University Press: 22 January 2016
Let
(1)
be a word in two variables X, Y, i.e. an element in the free group F2 on two generators X, Y. Let us say that f defines an associative composition for a group G if for arbitrary elements a, b, c in G we have
(2)
where a ° b is defined by
(3)
1 Iwasawa, K., Einige Satze uber freie Gruppen, Proc. Imp. Acad. Japan, 19 (1943), pp. 272–274 Google Scholar.
2 Note that is a central subgroup of Then for every a, b in G, c, d in we have (cf. H. Zassenhaus, Lehrbuch der Gruppentheorie, S. 57). The assertion is then completed by induction on i.