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La $z$ være en funksjon $z(x,y)=\\var{a} x^2+\\var{b}x^{\\var{c}}y+y^{\\var{d}}$ og  punkt $P=(\\var{f},\\var{g},z(\\var{f},\\var{g}))$

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Likningen til $z(x,y)$ i punktet $P$ blir

\n

$z=$ [[0]] + [[1]] $(x-(\\var{f}))$+ [[2]] $(y-\\var{g})$

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