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Re: Math Arrows and Harpoons
- To: math-font-discuss@cogs.susx.ac.uk
- Subject: Re: Math Arrows and Harpoons
- From: Hans Aberg <haberg@matematik.su.se>
- Date: Fri, 13 Nov 1998 23:49:28 +0100
- Content-Length: 3820
I made a classification of those arrows: It means that that I think that
most (if not all) of the arrows may be generated by the rules below.
Conversely, one can see from the classification what principle I think lies
behind the construction of the different arrows.
Clearly just a draft, but perhaps of some help.
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Arrow components: Head, Shaft, Tail.
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Head
none
simple 002
double 015
triple ->>>
harpoon-[up,down] [038,039]
triangle (or unfilled) 180
-----------------------------------------------------------------------
Shaft shape
simple 002
double 053
triple 065
bend-[up,down] 033
bend-twice-[up,down] [120,?]
bend-3-[up,down] [?,122]
circle-[clockwise,anti-clockwise] [188,187]
wiggly 126
zigzag 211
-----------------------------------------------------------------------
Shaft Bend: An arrow can bend sharply at need.
corner-[up,down] [028,029]
smooth corner-[up,down] [130,131]
-----------------------------------------------------------------------
Shaft continuity
continuous 002
broken 193
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Shaft length: The shaft may come in different lengths, but
as far as I know, it does not affect the semantic meaning of the
arrow.
-----------------------------------------------------------------------
Shaft style
---- continuous 002
-- -- -- long dashed 073
- - - dashed 075
.... dotted 077
-----------------------------------------------------------------------
Shaft ornament
slash (negation) 011
vertical 175
circle 179
cross 172
-----------------------------------------------------------------------
Tail
none 002
simple 018
double 117
triple >>>--
vertical 019
hook-[up,down] [080,082]
double-hook (fish-tail) 088
loop-[up,down] [026,?]
fork 199
circle 012
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Compound Arrows:
o Two can be laid side by side (050).
o The arrows can then have different size (169).
o The shaft can have a label (on either side) (145, 138,139).
o The head can point directly to another symbol (136).
o The tail can point directly to another symbol (203).
o An arrow can be drawn on top of another arrow (194).
o Perhaps replace [up,down] by [clockwise,anti-clockwise]
(or [positive,negative] direction of turn).
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Spurios Symbols
200 Perhaps a shaft with an ornament.
204 Not an arrow or an arrow-component as it stands.
-----------------------------------------------------------------------
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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/>