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**To**:*math-font-discuss@cogs.susx.ac.uk***Subject**:**Re: Math Arrows and Harpoons****From**:*Hans Aberg <haberg@matematik.su.se>***Date**: Sat, 14 Nov 1998 12:58:28 +0100- Content-Length: 2271

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. If I should try to remember cases of usage, then it is in traffic warning signs for a curvy road. -- Then some nations may have the arrow pointing bent, as the AFII pointed out by Barbara, and other nations may have it as in the LaTeX \leadsto symbol. For a traffic sign, the AFII variation may look better, but I still think that for math \leadsto would be the best. As for the design of the arrowhead, I think that it should simply point in the direction of the tangent of the shaft at the point where the arrowhead starts. Take for example the "033 21B7 curvearrowright": If prolonged more and more, the arrowhead would more and more point to the right. It its current design, if one looks carefully at it, the arrowhead points a bit too much down -- it should be a bit more to the right, to make it look better. One can also question whether the difference between the sharp/smooth shaft corners of 030 and 131 are no more than a matter of style, and not semantics. On shaft styles, I think there are variations like - . - . - dotted dash -- . -- . -- dotted long dash used by architects, cartographers, etc, even though I have not seen it in math. >> C204 has a strange name ... > >For clarity: this is char #204, (index >F524). Try to use hashes for characters in fonts if you will to avoid >confusion with the table indices. It's a typo due to the following rule for math typesetting: A sentence should never start with a math symbol or expression, as it will not look good in print. Computer scientists seem to not know about this rule, so I mentioned it here. So I first started the sentence with "204" and thought "should I not start the sentence with a letter?"... :-) 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/>

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