http://en.wikipedia.org/wiki/Topological_basis#Weight_and_character(adsbygoogle = window.adsbygoogle || []).push({});

The 4th bullet says that if B is a basis for a top. space T, there is a basis B' that has a cardinality less than the weight of the space, but right before, the weight was defined to be the minimum cardinality of a basis..

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# I don't understand this weight fact at all

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