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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 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 internal-categories k-theory lie-theory limits linear linear-algebra locale localization logic mathematics measure 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 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.
   • CommentAuthorAndrew Stacey
   • CommentTimeJan 5th 2010
   • (edited Jan 5th 2010)
   • PermaLink
   Author: Andrew Stacey
   Format: MarkdownWe've updated to ruby1.9. As with any update, there've been the odd teething issues. The main ones seem to be to do with unicode characters. The exact details aren't important, most have been fixed, but there is one "feature" that isn't and (probably) isn't going to get fixed. That's to do with non-ascii characters within mathematical expressions. The rule is: > Anything that will be parsed by iTeX should be ASCII only, and (X)HTML/SGML entities should be **numbered** rather than named. The most likely situation where this will occur is in `\text{}` commands embedded in mathematics. Within normal mathematics, one should always use the relevant iTeX command. So \text{∞-category} and \text{∞-category} won't work but \text{∞-category} and \text{∞-category} will work. I think that there are links to entity charts for those who need them. Please report any other issues.

   We've updated to ruby1.9. As with any update, there've been the odd teething issues. The main ones seem to be to do with unicode characters. The exact details aren't important, most have been fixed, but there is one "feature" that isn't and (probably) isn't going to get fixed. That's to do with non-ascii characters within mathematical expressions. The rule is:

   Anything that will be parsed by iTeX should be ASCII only, and (X)HTML/SGML entities should be numbered rather than named.

   The most likely situation where this will occur is in \text{} commands embedded in mathematics. Within normal mathematics, one should always use the relevant iTeX command.

   So

   \text{∞-category}
   

   and

   \text{∞-category}
   

   won't work but

   \text{∞-category}
   

   and

   \text{∞-category}
   

   will work. I think that there are links to entity charts for those who need them.

   Please report any other issues.

2. • CommentRowNumber2.
   • CommentAuthorMike Shulman
   • CommentTimeJan 5th 2010
   • PermaLink
   Author: Mike Shulman
   Format: MarkdownPresumably this should be on the [[FAQ]] or somewhere?

   Presumably this should be on the FAQ or somewhere?

3. • CommentRowNumber3.
   • CommentAuthorAndrew Stacey
   • CommentTimeJan 6th 2010
   • PermaLink
   Author: Andrew Stacey
   Format: MarkdownYes, I was in a rush when writing this and here seemed the best place to flag it. It should get added to the FAQ. If no-one else does it, I'll do it when I get a spare moment.

   Yes, I was in a rush when writing this and here seemed the best place to flag it. It should get added to the FAQ. If no-one else does it, I'll do it when I get a spare moment.