Alexandru Mustatea wrote:
> 
> 1) If I number formulas, numbering is done on the left side of the
> page. Can I move the numbers on the right side of the formulas, and closer
> to them?

in latex preamble:

\newlength{\myMargin}
\setlength{\myMargin}{1cm}% change the value to any other one
%
\renewcommand{\@eqnnum}{\hb@[email protected]\p@{}%
  \llap{\normalfont\normalcolor
  \hskip -\displaywidth(\theequation)}\hspace{\myMargin}%
}

> 2) If the numbers of numbered sections appear during the editing process,
> why are numbers of theorems or formulas replaced by #'s, actually
> appearing only in the compiled (dvi) document?

that's lyx-layout, read the chapter in help - custamization

> 3) How can I insert numbered lemmas, definitions etc. (not choosing AMS)?

\usepackage{ntheorem}

an example-file: 
http://www.educat.hu-berlin.de/~voss/lyx/data/algorithm.lyx

> 4) How can I replace the words "theorem", "bibliography" etc. with their
> Romanian equivalents ("teorema", "bibliografie" etc.) in documents?

have a look at ntheorem-doc
bibliography depends to your class-file. look at

http://www.educat.hu-berlin.de/~voss/lyx/bibtex/bibtex.html#bibname

> 5) In what menu are the symbols for various sets (complex, integer, real,
> rational numbers - C, Z, R, Q)?

\usepackage{dsfonts}
and in text in tex (red) \mathds{R}
or look at

http://www.educat.hu-berlin.de/~voss/lyx/lyx/symbols/symbols.html#set

Herbert


-- 
http://perce.de/lyx/


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