A topological space is said to be second countable if the topology admits a countable basis of open sets.
CITATION STYLE
Manetti, M. (2015). Sequences. In UNITEXT - La Matematica per il 3 piu 2 (Vol. 91, pp. 105–128). Springer-Verlag Italia s.r.l. https://doi.org/10.1007/978-3-319-16958-3_6
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