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2-category 2-category-theory abelian-categories adjoint algebra algebraic algebraic-geometry algebraic-topology analysis analytic-geometry arithmetic arithmetic-geometry book bundles calculus categorical categories category category-theory chern-weil-theory cohesion cohesive-homotopy-type-theory cohomology colimits combinatorics complex complex-geometry computable-mathematics computer-science constructive cosmology definitions deformation-theory descent diagrams differential differential-cohomology differential-equations differential-geometry digraphs duality elliptic-cohomology enriched fibration foundation foundations functional-analysis functor gauge-theory gebra geometric-quantization geometry graph graphs gravity grothendieck group group-theory harmonic-analysis higher higher-algebra higher-category-theory higher-differential-geometry higher-geometry higher-lie-theory higher-topos-theory homological homological-algebra homotopy homotopy-theory homotopy-type-theory index-theory integration integration-theory k-theory lie-theory limits linear linear-algebra locale localization logic mathematics measure-theory modal modal-logic model model-category-theory monad monads monoidal monoidal-category-theory morphism motives motivic-cohomology nlab noncommutative noncommutative-geometry number-theory object of operads operator operator-algebra order-theory pages pasting philosophy physics pro-object probability probability-theory quantization quantum quantum-field quantum-field-theory quantum-mechanics quantum-physics quantum-theory question representation representation-theory riemannian-geometry scheme schemes set set-theory sheaf simplicial space spin-geometry stable-homotopy-theory stack string string-theory superalgebra supergeometry svg symplectic-geometry synthetic-differential-geometry terminology theory topology topos topos-theory tqft type type-theory universal variational-calculus

1. • CommentRowNumber1.
   • CommentAuthorJohn Baez
   • CommentTimeJun 20th 2010
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   Author: John Baez
   Format: Html<a href = "http://AleksKleyn.blogspot.com/">Aleks Kleyn</a> emailed me saying he would like a reference or two to work on &Omega;-groups, so maybe someone can help him out. I put a query on <a href = "http://ncatlab.org/nlab/show/Omega-group">the relevant page</a>.

   Aleks Kleyn emailed me saying he would like a reference or two to work on Ω-groups, so maybe someone can help him out. I put a query on the relevant page.
2. • CommentRowNumber2.
   • CommentAuthorTim_Porter
   • CommentTimeJun 21st 2010
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   Author: Tim_Porter
   Format: MarkdownItexThere is a paper in an early JPAA by Grace Orzech, Obstruction theory in algebraic categories, which might be useful. I used Omega-groups briefly in a paper: Proceedings of the Edinburgh Mathematical Society (Series 2) (1987), 30: 373-381.

   There is a paper in an early JPAA by Grace Orzech, Obstruction theory in algebraic categories, which might be useful. I used Omega-groups briefly in a paper: Proceedings of the Edinburgh Mathematical Society (Series 2) (1987), 30: 373-381.

3. • CommentRowNumber3.
   • CommentAuthorzskoda
   • CommentTimeJun 26th 2010
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   Author: zskoda
   Format: MarkdownItexI removed the query and listed Bourbaki and Orzech and one more paper from algebra.

   I removed the query and listed Bourbaki and Orzech and one more paper from algebra.