Am 19.04.2010 22:57, schrieb Marshall Feldman:

(By the way in English there is no comma before the "and" if the part
after the "and" is the last enumeration in a sentence; like in
"A, B, C and D are letters.")

The following comes from the /Chicago Manual of Style/, 15th ed.,
section 6.18:

When a conjunction joins the last two elements in a series, a comma
-- known as the serial or series comma or the Oxford comma -- should
appear before the conjunction. Chicago strongly recommends this
widely practiced usage, blessed by Fowler and other authorities (see
bibliog. 1.2), since it prevents ambiguity.

Here's an example of what the CMS is talking about:

"The meal consisted of soup, salad, and macaroni and cheese."

I was saying the same. In your example there must be a comma before the first "and" because there is a further "and" in the last course.
In your formulas case you have only 3 courses:

so that
, and

would be wrong, because there is only one course behind the "and" and there is no further "and" inside the last course.

I recently had the same discussion with our English LyX manual proof reader who's working for a publishing company.

regards Uwe

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