At 15:48 97-04-21, J%org Knappen, Mainz wrote:

>I just want to keep the point in mind, that \mathsf is the prescribed
>font for tensors in mathematical formulae e. g. by the IUPAP (International
>Union of Pure and Applied Physicists) recommendations. And it is natural to
>name some tensors by greek letters (not necessarily confined to uppercase).

  I find this interesting: Do they state a reason for this recommendation,
so that there is a general principle behind it, like the idea with
typesetting constant names upright?
  (I picked an applied particle physics book at random, and it did not
typeset tensors sans serif.)

  Hans Aberg