منابع مشابه
Cubic leaves
We determine those cubic graphs with at most 22 vertices which are leaves of partial triple systems. As a first step towards a complete characterization of cubic leaves, we also show several classes of cubic graphs to be leaves.
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We prove that a codimension one foliation of an orientable paracompact manifold has at most a countable number of nonorientable leaves. We also give an example of a codimension one foliation of a compact orientable manifold with an infinite number of nonorientable leaves. Introduction. The purpose of this paper is to investigate the occurrence of nonorientable leaves in a codimension one foliat...
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ژورنال
عنوان ژورنال: The American Naturalist
سال: 1871
ISSN: 0003-0147,1537-5323
DOI: 10.1086/270829