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\usepackage[italian]{babel}
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\linespread{1.2} \hyphenation{ qua-dra-ti-ca
             ri-fe-ri-men-to cambia-mento equi-va-len-te-men-te
             com-ple-ta-men-to tra-sfor-ma-zio-ne dia-go-na-liz-za-ta ese-guen-do  rap-pre-sen-ta-no
             se-gno ovvia-mente  stu-diar-ne  va-ria-bi-li  coef-fi-cien-ti va-ria-bi-le
             se-le-zio-na-to  nor-ma-liz-za-ti
             }

\newtheorem{teo}{Teorema}
\newtheorem{prop}{Proposizione}
\newtheorem{defin}{Definizione}
\newtheorem{oss}{Osservazione}
\newtheorem{ese}{Esempio}[chapter]

\pagestyle{plain}

\usepackage[dvips]{color}
\pagecolor[gray]{.7}



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