Yago schrieb:

See the page Nr. 2 in the document ortomatem.pdf refered in the Lyx's Math 
Manual,

There is no such reference.
I googled this:
http://www.tex-tipografia.com/archive/ortomatem.pdf
There the also using round brackets on page 2 (Disposición de fórmulas aisladas)

page and 13

They write there for example
cos2vt
This is inexact wrong because this could mean
cos(2)*v*t or cos(2*v)*t
Moreover this is against the the character omitting rules, see below.

in the same document;and the reference to the ISO 31 in the page Nr. 18 about 
the round brackets.

In the norm it is defined that you _can_ but needn't to omit the brackets. But omitting the brackets leads to inexact result:
tan2pt
versus
tan2pt
In the first case I meant tan(2)*p*t, in the second I meant tan(2*p)*t. So you 
see the problem.

Besides this, look at
http://es.wikipedia.org/wiki/Funci%C3%B3n_matem%C3%A1tica
all other Wikipedia entries state the same. Typesetting rules are important to be able to communicate with each other. You can take any math book, look at webpages, school books, and also another LyX user told you as mathematician that your notation is incorrect. So it's up to you to change it or to ignore this.

regards Uwe

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