Commutators as products of squares. (English) Zbl 0268.20023


20F05 Generators, relations, and presentations of groups
20F10 Word problems, other decision problems, connections with logic and automata (group-theoretic aspects)
20E10 Quasivarieties and varieties of groups
20H05 Unimodular groups, congruence subgroups (group-theoretic aspects)
Full Text: DOI


[1] Karl Goldberg, Unimodular matrices of order 2 that commute, J. Washington Acad. Sci. 46 (1956), 337 – 338.
[2] A. Karrass and D. Solitar, On free products, Proc. Amer. Math. Soc. 9 (1958), 217 – 221. · Zbl 0089.01303
[3] Paul E. Schupp, On the substitution problem for free groups, Proc. Amer. Math. Soc. 23 (1969), 421 – 423. · Zbl 0186.03601
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