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(0 1)-category-theory 2-category 2-category-theory 2-monad abelian-categories accessible adjoint algebra algebraic algebraic-geometry analysis arithmetic beauty book bundle categories category category-theory chern-simons-theory cohesion cohesive-homotopy-type-theory cohomology combinatorics complex-geometry conference connection constructive constructive-mathematics cosmology deformation-theory descent differential differential-cohomology differential-geometry duality enriched enriched-category-theory enrichment examples factorization-system fibration forms foundations functional-analysis functor galois-theory gauge-theory gebra general topology geometric geometric-quantization geometry gravity group-theory higher higher-algebra higher-category-theory higher-geometry higher-topos-theory history homological homological-algebra homology homotopy homotopy-theory homotopy-type-theory homtopy-type-theory index-theory infinity-groupoid integration-theory internal-categories internalization kan lie lie-algebras lie-theory limit limits linear linear-algebra locale localization localization-theory logic manifolds mathematics measure measure-theory mechanics meta modal-logic model model-category-theory monad monoidal-category monoidal-category-theory morphism motivic-cohomology n-groups newpage noncommutative noncommutative-geometry operator operator-algebra order-theory particle-physics phenomenology philosophy physics pretopology pro-object probability-theory quantum quantum-field-theory quantum-mechanics quantum-physics quantum-theory question relative representation representation-theory riemannian-geometry scheme set set-theory sheaf simplicial space stable-homotopy-theory stack string string-theory subobject supergeometry symplectic-geometry tannaka tensor terminology theory topologica-quantum-field-theory topology topos topos-theory torsor tqft type type-theory universal weighted-limit

1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeMay 9th 2011
   • (edited May 9th 2011)
   • PermaLink
   Author: Urs
   Format: MarkdownItexfrom time to time I feel the need to have mapsto-arrows \mapsto > $\mapsto$ that point in other directions (left, up, down, sw, ne. nw, ect). Is this supported?

   from time to time I feel the need to have mapsto-arrows

     \mapsto
   

   $\mapsto$

   that point in other directions (left, up, down, sw, ne. nw, ect).

   Is this supported?

2. • CommentRowNumber2.
   • CommentAuthorMike Shulman
   • CommentTimeMay 9th 2011
   • PermaLink
   Author: Mike Shulman
   Format: MarkdownItexDoes even TeX have those? Does Unicode?

   Does even TeX have those? Does Unicode?

3. • CommentRowNumber3.
   • CommentAuthorEric
   • CommentTimeMay 9th 2011
   • PermaLink
   Author: Eric
   Format: MarkdownItexThe ability to rotate symbols is available in graphicx. Is that supported with itex?

   The ability to rotate symbols is available in graphicx. Is that supported with itex?

4. • CommentRowNumber4.
   • CommentAuthorUrs
   • CommentTimeMay 9th 2011
   • PermaLink
   Author: Urs
   Format: MarkdownItexOkay, so it's evidently not supported. Don't worry, I was just checking.

   Okay, so it’s evidently not supported. Don’t worry, I was just checking.

5. • CommentRowNumber5.
   • CommentAuthorAndrew Stacey
   • CommentTimeMay 9th 2011
   • PermaLink
   Author: Andrew Stacey
   Format: MarkdownItexI'm guessing you'd like something like ↤ ↥ ↦ or ↧. Or there are longer ones ⟻ and ⟼. I didn't see any diagonal ones, though (but I'm not an expert on searching the Unicode character list). These aren't supported by iTeX in the sense that there aren't commands like `\mapsfrom` that generate them. But they are supported in that you are always allowed to type Unicode characters directly in to the iTeX _as if_ they were iTeX commands. These do seem like a worthy addition to the iTeX suite of arrows. I recommend emailing Jacques to suggest them. Incidentally, the question - as always - is not really whether or not _iTeX_ supports these characters as to whether or not _MathML_ supports them. If not, one can always "resort" to SVG and draw them explicitly. Indeed, in my TeX documents I'm slowly switching to using TikZ to draw nice arrows instead of using the default TeX method of generating them from characters. The extendible arrows, for example, are constructed by placing the hyphen character next to itself enough times to fill the gap (with some overlaps). Sometimes, you can see the joins and it doesn't look pretty.

   I’m guessing you’d like something like ↤ ↥ ↦ or ↧. Or there are longer ones ⟻ and ⟼. I didn’t see any diagonal ones, though (but I’m not an expert on searching the Unicode character list).

   These aren’t supported by iTeX in the sense that there aren’t commands like \mapsfrom that generate them. But they are supported in that you are always allowed to type Unicode characters directly in to the iTeX as if they were iTeX commands.

   These do seem like a worthy addition to the iTeX suite of arrows. I recommend emailing Jacques to suggest them.

   Incidentally, the question - as always - is not really whether or not iTeX supports these characters as to whether or not MathML supports them. If not, one can always “resort” to SVG and draw them explicitly. Indeed, in my TeX documents I’m slowly switching to using TikZ to draw nice arrows instead of using the default TeX method of generating them from characters. The extendible arrows, for example, are constructed by placing the hyphen character next to itself enough times to fill the gap (with some overlaps). Sometimes, you can see the joins and it doesn’t look pretty.

6. • CommentRowNumber6.
   • CommentAuthorUrs
   • CommentTimeMay 9th 2011
   • PermaLink
   Author: Urs
   Format: MarkdownItex> I'm guessing you'd like something like ↤ ↥ ↦ or ↧. Or there are longer ones ⟻ and ⟼. Ah, thanks, that helps.

   I’m guessing you’d like something like ↤ ↥ ↦ or ↧. Or there are longer ones ⟻ and ⟼.

   Ah, thanks, that helps.

7. • CommentRowNumber7.
   • CommentAuthorUrs
   • CommentTimeMay 9th 2011
   • PermaLink
   Author: Urs
   Format: MarkdownItexIs there a long version of the downward pointing one?

   Is there a long version of the downward pointing one?

8. • CommentRowNumber8.
   • CommentAuthorAndrew Stacey
   • CommentTimeMay 9th 2011
   • PermaLink
   Author: Andrew Stacey
   Format: MarkdownItexDidn't see one in the unicode specification, it _may_ be possible to stack the requisite parts on top of each other; but a simple alternative would be to draw an arrow using SVG and then include it at the right place. I did this for some of the diagrams in [[Leinster2010]] where I thought that the arrow wasn't long enough. Take a look at [[doriath:SVGs for Leinster2010]] to get an idea of what I mean, and look at the source to see how easy it is once the arrows have been defined (unfortunately for you, I didn't do the mapsto-family in my original list, but it would be easy to add them in).

   Didn’t see one in the unicode specification, it may be possible to stack the requisite parts on top of each other; but a simple alternative would be to draw an arrow using SVG and then include it at the right place. I did this for some of the diagrams in Leinster2010 where I thought that the arrow wasn’t long enough. Take a look at SVGs for Leinster2010 (doriath) to get an idea of what I mean, and look at the source to see how easy it is once the arrows have been defined (unfortunately for you, I didn’t do the mapsto-family in my original list, but it would be easy to add them in).