[Tex/LaTex] Enumeration of theorems

theorems

Suppose I want to write a theorem.

Using 

\begin{theorem}
.......
\end{theorem

I obtain something like

Theorem 0.0.1

But I want only

Theorem 1

The preamble is 

\documentclass[10pt,a4paper,openany,italian,oneside]{book}

\usepackage{graphicx}

\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[italian]{babel}

\newcommand{\bs}[1]{{\boldsymbol{#1}}}
\setcounter{tocdepth}{1}
\newtheorem{theorem}{Teorema}[section]
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{proposition}[theorem]{Proposizione}
\newtheorem{corollary}[theorem]{Corollario}

What can I do?

Best Answer

The theorem numbering is defined in the line

\newtheorem{theorem}{Teorema}[section]

By default, each theorem uses its own numbering (1,2,3...): the parameter "[section]" adds the "0.0." you are trying to avoid.

Further information can be found here, in the "Theorem numbering" section.

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