Exerpt from book of Magnus, Karras, Solitar. This is Theorem 1.2, showing that every element of the free group F_n is defined by a unique reduced word.
CITATION STYLE
Higgins, P. J. (1968). COMBINATORIAL GROUP THEORY. Journal of the London Mathematical Society, s1-43(1), 557–558. https://doi.org/10.1112/jlms/s1-43.1.557
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