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Hi, thanks you all for help, it worked. I'm using amsmath.
Beer for everyone ;]

This is small fragment of my .tex file:
\newtheorem{definition}{Definition}[subsection]
\newtheorem{example}{Example}[subsection]
\newtheorem{theorem}{Theorem}[subsection]

I have subsection, which number is for example 1.2 and within some theorems definitions and examples. The document looks like ...

Hi,
I'm new to LaTeX and very interested in it. I'm writing my masters degree using it, so I'll have some questions