نتایج جستجو برای: k

تعداد نتایج: 377703  

Journal: :Discrete Mathematics 1987

1999
Arvind Gupta Damon Kaller Thomas C. Shermer

We introduce new techniques for studying the structure of partial k-trees. In particular, we show that the complements of partial k-trees provide an intuitively-appealing characterization of partial k-tree obstructions. We use this characterization to obtain a lower bound of 2 (k log k) on the number of obstructions, signi cantly improving the previously best-known bound of 2 ( p . Our techniqu...

‎In this paper‎, ‎we introduce the notion of strongly $k-$spaces (with the weak (=finest) pre-topology generated by their strongly compact subsets)‎. ‎We characterize the strongly $k-$spaces and investigate the relationships between preclosedness‎, ‎locally strongly compactness‎, ‎pre-first countableness and being strongly $k-$space.

2009
Darij Grinberg

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