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1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeJun 20th 2012
   • PermaLink
   Author: Urs
   Format: MarkdownItexstarted a stub for _[[ring extension]]_ to go with the Café-discussion [here](http://golem.ph.utexas.edu/category/2012/06/cohomology_in_everyday_life.html#c041660).

   started a stub for ring extension to go with the Café-discussion here.

2. • CommentRowNumber2.
   • CommentAuthorTim_Porter
   • CommentTimeJun 20th 2012
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   Author: Tim_Porter
   Format: MarkdownItexDoes someone have a precise reference for the original of Everett's theorem, e.g. Math Rev number? I had not heard of that result before but knew of work by Frohlich, Lue and others on similar ideas, but these were probably later as I found a reference to a reference (?) to the theory from 1959.

   Does someone have a precise reference for the original of Everett’s theorem, e.g. Math Rev number? I had not heard of that result before but knew of work by Frohlich, Lue and others on similar ideas, but these were probably later as I found a reference to a reference (?) to the theory from 1959.