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**To**:*math-font-discuss@cogs.susx.ac.uk***Subject**:**Re: Math Arrows and Harpoons, Draft Three****From**:*Taco Hoekwater <taco.hoekwater@wkap.nl>***Date**: Sun, 15 Nov 1998 18:16:56 +0100 (W. Europe Standard Time)- Content-Length: 2863

>>>>> "HA" == Hans Aberg <haberg@matematik.su.se> writes: HA> (I, and perhaps some others, are not on the group HA> tex-nl@nic.surfnet.nl, so any responses on this topic there HA> relevant to the math-font-discuss@cogs.susx.ac.uk group needs to HA> cc this one.) tex-nl is addressed only on my announcements. This is the dutch TeX mailing list, where there are some people that are also interested. You might be right about the newsgroup, but I don't read netnews, so it would be hard for me to keep track of the discussions. If someone else wants to take care of that newsgroup (and possibly others) for me, I would be much obliged. HA> On the arrows 000-003 and the short arrows (or arrowhead HA> components) 011-014, I can not recall any math situation where HA> the length of an arrow has any semantic significance. They are in the tables, and other than that they have the advantage that the TeX macros can use [Uu]p, [Dd]own and [Uu]pdown arrows as delimiters. Consider this the start of the construction kit, if you will. >> - redesigned triangle heads HA> The arrows 114-116 I think now looks much better. I can note HA> however that the back of these arrowheads are now bent in the HA> opposite of the regular arrowheads (009,002,004). This was necessary, bending in the other direction looked ridiculous. HA> and it did not have it); I know that 125/127 can be used to HA> denote an ASCII return on computers. In fact, 157 is labeled "carriage return". HA> I am not sure this is all logical: For example one the arrows HA> 129/174, they look semantically the same to me. I would prefer a HA> variation looking more like 129, except that I would not require HA> it to be an exact semicircle, just a bend -- so therefore HA> something like 174 would be acceptable to me. In addition, I HA> would use this kind of arrows as a variation of the plain arrow HA> 002, so therefore 174 seems to be acceptable to me (it should HA> then come with a mirror reversed version). 129 looks strange to me too. But it just happens to be in Unicode... HA> On 137-138, one use is in closed line integrals in physics HA> (even though these integral signs probably have separate HA> symbols). So it could be that these should be fully closed HA> circles with an arrowhead onto. In the case of the line HA> integrals, the arrowhead should be to the side, not the top, in HA> order to not be in the way of the integral sign symbol. There are separate symbols for the closed line integrals. To appear. HA> The two arrows >->> and <<-< seem to not be present: These are HA> used in category thoery to indicate that a homomorhism is both HA> mono and epi (and thus iso in say an Abelian category). (Thus a HA> head like in 015/017 and a tail as in 009-010.) One of these is 150, I will add the other one. Greetings, Taco

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