Pure Galois theory in categories (1990)

by G Janelidze
Venue:J. Algebra
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unknown title

by Ronald Brown, George Janelidze, Uwb Maths Preprint , 2008
"... Galois theory and a new homotopy double groupoid of a map of spaces ..."
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Galois theory and a new homotopy double groupoid of a map of spaces

Higher central extensions and Hopf formulae

by Tomas Everaert , 902
"... Higher extensions and higher central extensions, which are of importance to non-abelian homological algebra, are studied, and some fundamental properties are proven. As an application, a direct proof of the invariance of the higher Hopf formulae is obtained. 0 ..."
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Higher extensions and higher central extensions, which are of importance to non-abelian homological algebra, are studied, and some fundamental properties are proven. As an application, a direct proof of the invariance of the higher Hopf formulae is obtained. 0