1 and let U be the kernel of cpo As coset representatives we take 1, y, y2, . ,yn-1; clearly, this system fulfils the Schreier condition. Then the ReidemeisterSchreier generators for U are the non-trivial elements of the following set: . - -1 . - -1 {y' . X . +1 ,y' . y . +1 I i = 0, ... ,n - I}. We obtain the non-trivial elements y* = yn-1 .

# Algebra VII: Combinatorial Group Theory Applications to by A. N. Parshin (auth.), A. N. Parshin, I. R. Shafarevich

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