Abstract
Let exp(X) denote the exponential space of a topological spaceX introduced by Vietoris [14]. In this paper, we study the subspaces of the space exp(N), whereN={1, 2, 3, ...} is the discrete space of natural numbers. We also show that if the metrizability number of exp(X) is countable, thenX (and exp(X)) must be compact and metrizable.
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