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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
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\newtheorem{defin}{Definizione}
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\begin{document}
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% !!! IMAGES START HERE !!!

{\newpage\clearpage
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$\displaystyle \mathcal{Q}: \,3x^2+y^2-z^2+2xy-2x+4z+5=0;
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2 & 0 & 0 & -1 \\ 
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$ \;det\mathcal{A} \neq 0 \quad \Rightarrow \quad r(Q)=4
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\end{document}
