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