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Message-ID:  <199705050930.LAA10587@macbeth.uni-duesseldorf.de>
Reply-To: Mailing list for the LaTeX3 project
              <LATEX-L@RELAY.URZ.UNI-HEIDELBERG.DE>
In-Reply-To:  <v02130500af83be59401f@[130.237.37.111]> (message from Hans Aberg
              on Wed, 23 Apr 1997 16:05:17 +0200)
Date:         Mon, 5 May 1997 11:30:23 +0200
From: Ulrik Vieth <vieth@THPHY.UNI-DUESSELDORF.DE>
Sender: Mailing list for the LaTeX3 project
              <LATEX-L@RELAY.URZ.UNI-HEIDELBERG.DE>
To: Multiple recipients of list LATEX-L
              <LATEX-L@RELAY.URZ.UNI-HEIDELBERG.DE>
Subject:      \mathsf for tensors (was: Capital greek letters)
Status: R

Hans Aberg:

>   But if you decide to typeset tensors upright sans serif, then the
> Christoffel symbol, which normally is an upper case $\Gamma$, should be
> typeset like that too. (But using a $\Gamma$ for the Christoffel symbol is
> so standard, it should perhaps be typeset upright anyhow.)

I'm not quite sure what you mean.  If you are refering to a specific
Christoffel symbol $\Gamma_{ij}^{k}$, you're dealing with a scalar
compnent of a pseudo-tensor, which means that the $\Gamma$ would be
set in \mathnormal anyway (whether upright or italics might depend
on the publisher's preferences for uppercase greek).

Bold sans serif (oblique) would only be used when referring to
a tensor as a whole, e.g. when writing about the metric tensor
$\mathtens{g} = (g_{ij})$.  Writing $\mathtens{\Gamma}$ to refer
to all the Christoffel symbols as a whole would be very unusual
indeed, so there's probably little reason to worry.

Cheers, Ulrik.