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Any 2-Sphere in E3 with Uniform Interior Tangent Balls is Flat

Published online by Cambridge University Press:  20 November 2018

R. J. Daverman  and
L. D. Loveland
R. J. Daverman
Affiliation:
The University of Tennessee, Knoxville, Tennessee
L. D. Loveland
Affiliation:
Utah State University, Logan, Utah
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This paper addresses some flatness properties of an (n – 1)-sphere Σ in Euclidean n-space En resulting from the presence of round balls in En tangent to Σ. The notion of tangency used here is geometric rather than differentiable, for a round n-cell Bp (that is, the set of points whose distance, in the standard metric, from some center point is less than or equal to a fixed positive number) is said to be tangent to the (n – 1)-sphere Σ in En at a point p ∈ Σ if p ∈ Bp and Int Bp ⊂ Σ = ∅. The ball Bp is called an interior tangent ball at p if Int Bp ⊂ Int Σ; otherwise, it is called an exterior tangent ball at p.

Type
Research Article
Information
Canadian Journal of Mathematics , Volume 33 , Issue 1 , 01 February 1981 , pp. 150 - 167
Copyright
Copyright © Canadian Mathematical Society 1981

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