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mathematical def[edit]

"a collection τ of subsets of a set X […] and τ is closed […]"
What is meant by "closed" ? --Jerome Potts 20:39, 29 November 2010 (UTC)

Link to topography[edit]

The nouns definitions have the subject area of each definition in brackets, such as (mathematics). In the wiki code these are marked up as {{context}}. Some of them show on the page as clickable links. Topography doesn't. I manually added a link for that but I'm wondering why it was necessary. Where is the coding that makes {{context|(mathematics)|lang=en}} and {{context|(computing)|lang=en}} show a link but not {{context|(topography)|lang=en}}? 14:48, 12 September 2014 (UTC)

I think you want Module:labels/data. Equinox 15:01, 12 September 2014 (UTC)