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considerably expanded the entry strict 2-group.
Apart from adding an introductory discussion, and expanding the list of examples, in particular by adding that of automorphism 2-groups ...
... I in particular give the detailed translation prescription for how to encode a 2-group by a crossed module at In terms of crossed modules
This is to eventually serve as a supplement to the discussion at nonabelian group cohomology. So I spent some energy on disentangling the four different (though isomorphic) ways a crossed module gives rise to a 2-group (following my article with David Roberts).
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