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Untitled edit
This article begins thus:
- In mathematics, in particular in topology, the de Groot dual of a topology τ on a set X is
It does not yet say this:
- In mathematics, in particular in topology, the de Groot dual of a topology τ on a set X, named after ?????? de Groot, is
Could someone supply that information? Michael Hardy (talk) 05:00, 18 March 2010 (UTC)