# Re: Stretchy equal sign for commutative diagrams

From: Frédéric WANG <fred.wang@free.fr>
Date: Tue, 26 Mar 2013 19:45:11 +0100
Message-ID: <5151ECB7.306@free.fr>

Thanks Neil. I believe the COMBINING characters won't be a good choice,
because they are designed to be combined with another character. Also
all the characters seem to be over/below/low line, contrary to the equal
sign. I guess the equal sign is the one with the best semantics for the
commutative diagram.

Now, I'm thinking about the mhchem package. Here we need horizontal
lines (simple, double or triple) to draw chemical bonds. MathJax uses
the minus, equal and congruence symbols (all non stretchy) but that's
not really good semantics... The characters from the box drawing blocks
that David mentioned are probably better for that purpose.

On 26/03/2013 19:19, Neil Soiffer wrote:
> Sorry for joining this late.  MathPlayer currently can make use of:
>
> COMBINING DOUBLE LOW LINE' (U+0333)
> COMBINING EQUALS SIGN BELOW' (U+0347)
> COMBINING DOUBLE OVERLINE' (U+033F)
> DOUBLE LOW LINE' (U+2017)
>
> I don't think any of them are stretchy by default.
>
> Adding '=' would (I think) be very simple.
>
>     Neil

--
Frédéric Wang
maths-informatique-jeux.com/blog/frederic

Received on Tuesday, 26 March 2013 18:49:21 UTC

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