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Re: Math Arrows and Harpoons

>At 09:45 +0100 1998/11/14, Taco Hoekwater wrote:
>>>the case of 032 21B6 curvearrowleft 033 21B7 curvearrowright I feel sure
>>> it is not essential that the arrowhead points down... It should
>...
>>Barbara, any comments from AFII? I'll mirror the other 5 arrows into
>>new slots so there will be versions with and without angled heads.

Yet another strategy for cases like this, and wholly similar arrows such as
030 and 131, could be to first ask the question: Are these arrows
sufficiently distinct to be used side-by-side in the same text or formula?

  If they are so close that they can be confused, then they might be viewed
as different renderings of the same symbol. Then the safest choice is to
make up a font of the renderings that mathematicians deem correct (if the
idea is that the fonts should be used to present mathematics). Alternative
renderings can be presented in a comment: Those that need them could
develop a special font, or put them into Unicode slots for non-mathematical
use.

  So for the arrows 030 and 131, I tend to believe that these are different
renderings of the same symbol.

  I also think that 171 should be viewed as an arrow with another arrow
used as a label on the shaft rather than a composite of two parallel arrows.

  Hans Aberg
                  * Email: Hans Aberg <mailto:haberg@member.ams.org>
                  * Home Page: <http://www.matematik.su.se/~haberg/>
                  * AMS member listing: <http://www.ams.org/cml/>