$ \alpha _i$-properties, selection principles and the ideals

Sumit Singh; Geetanjali Raiya; Manoj Kumar Rana

doi:10.5269/bspm.76311

Sumit Singh Department of Mathematics, Ramjas College, University of Delhi, University Enclave, Delhi-110007, India.
Geetanjali Raiya Department of Mathematics, Janki Devi Memorial College, University of Delhi, Delhi-110060, India
Manoj Kumar Rana Department of Mathematics, Ramjas College, University of Delhi, University Enclave, Delhi-110007, India.

Résumé

Ko\v{c}inac \cite{KDR} introduced several $ \alpha_i $-properties as a selection principles and there were motivated by Arhangel'skii \cite{AAV} $ \alpha_i $-local properties. In this paper, we identify some classes $ \mathcal{A} $ and $ \mathcal{B} $ of open covers in topological spaces, topological groups, hyperspaces and abstract boundedness for which the Ko\v{c}inac $ \alpha_i (\mathcal{A}, \mathcal{B}) $-properties are closely related and often equivalent to $ S_1 (\mathcal{A}, \mathcal{B}) $, using the notion of an ideal. Further we introduce the ideal form of Hurewicz-bounded topological group and characterize it using these $ \alpha_i $-properties.

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