**From:** Hans Aberg (*haberg@math.su.se*)

**Date:** Tue May 31 2005 - 06:07:35 CDT

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At 11:12 +0200 2005/05/31, Jörg Knappen wrote:

*>On Sat, 14 May 2005, Murray Sargent wrote:
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*>
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*>> The STIX committee (see http://www.unicode.org/reports/tr25/ for
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*>> references) chose the sets of mathematical alphanumerics. I agree with
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*>> you that sans-serif characters in general are rarely used in
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*>> mathematics, at least in the mathematics of physics.
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*>
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*>I once surveyed the usage of different kinds of greek in math and physics
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*>(and had a talk about this on EuroTeX 1992 in Prague). I encountered
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*>italic sans serif greek letters (for tensors) in one journal, this journal
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*>was >>Il nouvo cimento<<.
*

Wasn't it discussed in the LaTeX List an

engineering standard for tensors, perhaps even

ISO? I recall that it conflicted with the usage

in pure math. Can any tell if called for

sans-serif tensors?

The principle for adding math characters, though

is that it is required for proper semantic

expressions. I doubt pure math texts use serifs

and sans-serif side-by-side to express semantic

differences. I think that all the TeX fonts

commonly used in math have serifs, and they do

not have all the serif Greek variations that

Unicode already has. But past practise, was

limited by availability, so one cannot look too

much on that.

But one could perhaps argue that this sans-serif

practise is used by engineers, and in some way

makes up a different script, and therefore it

should be there. This is a way of rationalizing

what is already in the Unicode character set. If

the engineers feel about it in this way, perhaps

the Greek sans-serif plain letters should be

added, in addition to the bold one already there.

Then, tying it up with the above engineering

tensor standard, it will no longer conflict with

pure math conventions.

I should perhaps add that I feel that the

sans-serif forms are unnecessary for semantically

expressing pure math (just as the monospace

ones). So it is really a question of what others

who may use them feel about it.

-- Hans Aberg

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