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On closed additive semigroups in $ E\sp{n}$

Author: Christoph Bandelow
Journal: Proc. Amer. Math. Soc. 34 (1972), 87-89
MSC: Primary 22A15; Secondary 50A05, 60J15
MathSciNet review: 0292993
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Abstract: Let $ C(A)$ be the closed additive semigroup generated by a set $ A \subset {E^n}$. A simple necessary and sufficient condition on A for $ C(A)$ to be a group is derived. An example which arose in the theory of random walks and stimulated these purely geometrical considerations is discussed at the end.

References [Enhancements On Off] (What's this?)

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Keywords: Closed additive semigroup in $ {E^n}$, closed additive group in $ {E^n}$, convex set, random walk
Article copyright: © Copyright 1972 American Mathematical Society

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