\begin{ccRefConcept}{Polynomial_2} \ccDefinition A model of \ccRefName\ represents a bivariate polynomial over some basic ring $R$. The concept \ccRefName\ refines \ccc{Polynomial_d} by fixing $d$ to $2$. \ccRefines \ccc{Polynomial_d}\\ \ccSeeAlso \ccRefIdfierPage{Polynomial_d}\\ \ccRefIdfierPage{PolynomialTraits_d}\\ \ccRefIdfierPage{AlgebraicStructureTraits}\\ \ccHasModels \end{ccRefConcept}