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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeMay 9th 2011
• (edited May 9th 2011)

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

  \mapsto


$↦$

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

Is this supported?

• CommentRowNumber2.
• CommentAuthorMike Shulman
• CommentTimeMay 9th 2011

Does even TeX have those? Does Unicode?

• CommentRowNumber3.
• CommentAuthorEric
• CommentTimeMay 9th 2011

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

• CommentRowNumber4.
• CommentAuthorUrs
• CommentTimeMay 9th 2011

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

• CommentRowNumber5.
• CommentAuthorAndrew Stacey
• CommentTimeMay 9th 2011

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.

• CommentRowNumber6.
• CommentAuthorUrs
• CommentTimeMay 9th 2011

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

Ah, thanks, that helps.

• CommentRowNumber7.
• CommentAuthorUrs
• CommentTimeMay 9th 2011

Is there a long version of the downward pointing one?

• CommentRowNumber8.
• CommentAuthorAndrew Stacey
• CommentTimeMay 9th 2011

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).