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Re: (hooks) MathML arrow fonts

> Date: Wed, 18 Nov 1998 12:11:54 +0100
> To: Taco Hoekwater <taco.hoekwater@wkap.nl>
> From: Hans Aberg <haberg@matematik.su.se>
> Subject: Re: (hooks) MathML arrow fonts
> Cc: vojta@math.berkeley.edu (Paul Vojta), math-font-discuss@cogs.susx.ac.uk
>
> At 09:33 +0100 1998/11/18, Taco Hoekwater wrote:
> > PV> 	\lhook, \rhook (as in AmSTeX)
> >
> >I intend to add these two, but thanks for reminding me. These are
> >essentially building blocks like the arrow tails, yes?
>
> They are actually defined in PlainTeX, see Knuth's The TeXBook, p 358. He
> uses them exclusively to build hooks on arrows.
>
> I think that Paul Vojta should indicate how he is using them: If used as
> binary operations, then they should have separate slots in Unicode.

I use them as building blocks for long arrows, etc.  I do not use them
as binary relations.

--Paul Vojta, vojta@math.berkeley.edu