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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 nforum nlab noncommutative noncommutative-geometry number-theory 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.
   • CommentAuthorUrs
   • CommentTimeDec 21st 2010
   • PermaLink
   Author: Urs
   Format: MarkdownItexsomebody signing as "Anonymous Coward" dropped a query box with a question at [[semigroup]].

   somebody signing as “Anonymous Coward” dropped a query box with a question at semigroup.

2. • CommentRowNumber2.
   • CommentAuthorDavidRoberts
   • CommentTimeDec 22nd 2010
   • PermaLink
   Author: DavidRoberts
   Format: MarkdownItexA bit of an answer, with a literature reference. We'll see if it turns out to be useful.

   A bit of an answer, with a literature reference. We’ll see if it turns out to be useful.

3. • CommentRowNumber3.
   • CommentAuthorUrs
   • CommentTimeDec 22nd 2010
   • PermaLink
   Author: Urs
   Format: MarkdownItexI suggest to move any further discussion here and keep at the entry only whatever stable information materializes.

   I suggest to move any further discussion here and keep at the entry only whatever stable information materializes.

4. • CommentRowNumber4.
   • CommentAuthorzskoda
   • CommentTimeDec 22nd 2010
   • (edited Dec 22nd 2010)
   • PermaLink
   Author: zskoda
   Format: MarkdownItexUrs, the anonymous coward is probably a user of famous nlab and not very likely familiar with much less known nForum. Almost every mathematician in aclose area I meet nowdays knows of nlab but very few heard of nForum, or could find it and use it. Besides we still do not have an automatic way to search in nForum for all pages which quote a link to a particular nLab page in one of its aliases.

   Urs, the anonymous coward is probably a user of famous nlab and not very likely familiar with much less known nForum. Almost every mathematician in aclose area I meet nowdays knows of nlab but very few heard of nForum, or could find it and use it. Besides we still do not have an automatic way to search in nForum for all pages which quote a link to a particular nLab page in one of its aliases.

5. • CommentRowNumber5.
   • CommentAuthorUrs
   • CommentTimeDec 23rd 2010
   • PermaLink
   Author: Urs
   Format: MarkdownItexall of those who replied are nForum regulars. They can leave a note there and continue the discussion here.

   all of those who replied are nForum regulars. They can leave a note there and continue the discussion here.

6. • CommentRowNumber6.
   • CommentAuthorTobyBartels
   • CommentTimeDec 23rd 2010
   • PermaLink
   Author: TobyBartels
   Format: MarkdownItexI'm not going to do that. Keep it simple.

   I’m not going to do that. Keep it simple.