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

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\usepackage[dvips]{color}
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\begin{document}
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% !!! IMAGES START HERE !!!

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$ \,\mathcal{A}_0\,$%
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$ \,\mathcal{M}\,$%
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$\displaystyle \mathcal{Q}: \,2x^2+y^2+z^2-2yz-4y+3z+1=0;
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z' \\ 
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$ \,y'$%
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$ \checkmark $%
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\end{document}
