A combinatorial characterization of planar 2-complexes
نویسندگان
چکیده
منابع مشابه
On combinatorial characterization of planar $st$ graphs
The notion of a planar st graph (also known as e-bipolar planar graph) is essentially equivalent to that of a progressive plane graph, which was introduced by Joyal and Street in the theory of graphical calculus for tensor categories. Fraysseix and Mendez have shown a bijection between equivalence classes of planar st embeddings of a directed graph G and the conjugate orders of the edge poset o...
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Group presentations are implicit descriptions of 2-dimensional cell complexes with only one vertex. While such complexes are usually sufficient for topological investigations of groups, multi-vertex complexes are often preferable when the focus shifts to geometric considerations. In this article, I show how to quickly describe the most important multivertex 2-complexes using a slight variation ...
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We have recently synthesized Ti(BH4)3(THF)3 and V(BH4)2(TMEDA)2 complexes. The reaction of TiCl3(THF)3 with NaBH4 in dry THF gave flat blue crystals, Ti(BH4)3(THF)3. The reaction of VCl3 with NaBH4 in presence of N, N, N', N'- tetramethyle...
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ژورنال
عنوان ژورنال: Colloquium Mathematicum
سال: 1981
ISSN: 0010-1354,1730-6302
DOI: 10.4064/cm-44-2-241-247