# Re: Vertical spacing of matrices

Uwe, in the page 2 you have on top an specific trigonometric example (Blancos) without brackets. And more, when I say that the brackets are no necessary is because LaTeX add a little space between the function and his argument. So the reality is that LaTeX don't type,
```
cos2vt```
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but,

cos 2vt

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with a little more space after "cos" and this is very comprehensive for everybody.
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Please don't mention me the Wikipedia because this resource isn't at all a "canon" for nothing.
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Regards Yago.
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----- Original Message ----- From: "Uwe Stöhr" <uwesto...@web.de>
```To: "Yago" <diazd...@ono.com>
Cc: "LyX-Users" <lyx-users@lists.lyx.org>
Sent: Saturday, September 12, 2009 11:17 PM
Subject: Re: Vertical spacing of matrices

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```Yago schrieb:

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See the page Nr. 2 in the document ortomatem.pdf refered in the Lyx's Math Manual,
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There is no such reference.
http://www.tex-tipografia.com/archive/ortomatem.pdf
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There the also using round brackets on page 2 (Disposición de fórmulas aisladas)
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```page and 13
```
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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.

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in the same document;and the reference to the ISO 31 in the page Nr. 18 about the round brackets.
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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.
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Besides this, look at
http://es.wikipedia.org/wiki/Funci%C3%B3n_matem%C3%A1tica
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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.
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regards Uwe
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```