7.3 Automorphisms of the free group 89 we may write, in the notation of NIELSEN (1924b, p. 171), P = [S2, S1, S3, . . . , Sn]. Similarly Q = [S2, S3,..., Sn, Sil, O = [SI', S2,..., S.J., U = [SIS2, S2,..., S.]. These transformations P ...
Initially a small block of wood, P, coloured to represent a wagon, is placed at B; a similar block, Q, is placed at C; and a longer block of wood, R, representing an engine, is placed at E. The problem is to use the engine R to ...
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... span the space . ) We therefore consider the group as acting on a sphere with centre O , and replace its angular ... reflections has a simplex for its fundamental region . Since spherical space is finite , whereas Euclidean space is ...