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A Note on Orbits of Subgroups of the Permutation Groups

Published online by Cambridge University Press:  20 November 2018

R. D. Leitch*
Affiliation:
Royal Military College of Science, Shrivenham, England
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In [2] we studied Milgram's Complex, C(n – 1), which was first defined in [3], in the following manner. Let Sn, the permutation group of n symbols, act on Rn in the obvious manner; put α(x) = (y), where yi = xα–1(i). Let s = (1, 2, …, n), then C(n – 1) is the convex hull of the points α(s), αSn. Here we shall generalise this construction as follows. Let G be a subgroup of Sn, and let vRn. Then C(G, v) is the convex hull of α(v), αG. We prove invariance over v subject to certain restrictions, give counter-examples to shew lack of invariance if we alter G, discuss how we may describe C(G, v), shew that the only “nice” case is essentially when G is Sn, and lastly give some examples.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 1986

References

1. Cairns, S. S., Introductory topology (Ronald Press Co., N.Y., 1961).Google Scholar
2. Leitch, R. D., The homotopy commutative cube, J. Lon. Math. Soc. (2)(1974), 2329.Google Scholar
3. Milgram, R. J., Iterated loop spaces, Ann. Math 84 (1966), 386403.Google Scholar