FROM TOPOLOGIES OF A SET TO SUBRINGS OF ITS POWER SET
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DOI: 10.1017/s0004972720000015
Abstract: Let $X$ be a nonempty set and ${\mathcal{P}}(X)$ the power set of $X$. The aim of this paper is to identify the unital subrings of ${\mathcal{P}}(X)$ and to compute its cardinality when it is finite.… read more here.
Keywords: unicode stix; stix x1d70f; x1d70f unicode;