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''Basis is a [[mathematical]] term.''
A '''basis''' ''B'' for a topology ''T'' on a set ''X'' is a collection of subsets of ''X'' (called '''basis elements''') such that
A '''basis''' ''B'' for a topology ''T'' on a set ''X'' is a collection of subsets of ''X'' (called '''basis elements''') such that
#each ''x'' in ''X'', is in at least one basis element.
#each ''x'' in ''X'', is in at least one basis element.