The format of p, the polynomial coefficients, is similar to 1-D polynomials:
\[\begin{aligned} f\left(x,y\right)=&p_1 x^n y^m+p_2 x^{\left(n-1\right)} y^m+\ldots+p_{n+1} y^m+\ldots \\ &p_{n+2}x^ny^{\left(m-1\right)}+p_{n+3}x^{\left(n-1\right)}y^{\left(m-1\right)}+\ldots+p_{2\left(n+1\right)}y^{\left(m-1\right)}+\ldots \\ &\ldots \\ &p_{m\left(n+1\right)+1}*x^n+p_{m\left(n+1\right)+2}*x^{\left(n-1\right)}+\ldots+p_{\left(n+1\right)\left(m+1\right)} \end{aligned} \]
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