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Characterizations of $\mathbb{N}$-compactness and realcompactness via ultrafilters in the absence of the axiom of choice https://arxiv.org/abs/2408.01461 #mathGN
Characterizations of $\mathbb{N}$-compactness and realcompactness via ultrafilters in the absence of the axiom of choice https://arxiv.org/abs/2408.01461 #mathGN