every e-disk in a metric space is open

open sets, empty set, e-disk, such that, metric space, vector space, closed sets, bounded sets, metric space, union of open sets, union of open subsets, open metric space, zero set, topological concepts,

open sets, empty set, e-disk, such that, metric space, vector space, closed sets, bounded sets, metric space, union of open sets, union of open subsets, open metric space, zero set, topological concepts, every e-disk in a metric space is open

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