Recall that a collection 79 of subsets of a space is star-countable if each element of 7 ~ meets at most countably many other elements of 79. We characterize the closed image of a locally separable metric space as a Frrchet space with a star-countable k-network, and give a characterization for the p
On a common generalization of k-spaces and spaces with countable tightness
✍ Scribed by A.V. Arhangel'skiǐ; D.N. Stavrova
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 509 KB
- Volume
- 51
- Category
- Article
- ISSN
- 0166-8641
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
In this paper, we prove a strong convergence theorem by the hybrid method for a countable family of relatively nonexpansive mappings in a Banach space. We also establish a new control condition for the sequence of mappings {T n } which is weaker than the control condition in Lemma 3.1 of Aoyama et a
Configuration interaction (CI) spaces obtained from the full CI space by imposing arbitrary restrictions on the occupancies of molecular orbital (MO) groups are studied. It is proved that such restricted spaces are in a certain sense "closed." Namely, in the course of the Hamiltonian matrix construc