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Are Quasars Local or Cosmological ?

✍ Scribed by ROWAN-ROBINSON, M.


Book ID
109681775
Publisher
Nature Publishing Group
Year
1972
Tongue
English
Weight
347 KB
Volume
236
Category
Article
ISSN
0028-0836

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πŸ“œ SIMILAR VOLUMES


Steiner type problems for digraphs that
✍ JΓΈrgen Bang-Jensen; Gregory Gutin; Anders Yeo πŸ“‚ Article πŸ“… 2003 πŸ› John Wiley and Sons 🌐 English βš– 138 KB

## Abstract We consider the following three problems: (P1) Let __D__ be a strong digraph and let __X__ be a non‐empty subset of its vertices. Find a strong subdigraph __D__β€² of __D__ which contains all vertices of __X__ and has as few arcs as possible. This problem is also known under the name the