Mathematical equation refers to a set of equations or inequalities containing an unknown X. The types of equations are divided according to the different numbers of unknowns, the different powers of unknowns and the different numbers and powers of unknowns.
Classification is divided into univariate equation, bivariate equation and multivariate equation according to the number of unknowns;
According to the power of the unknown, it can be divided into linear equation, quadratic equation and multivariate equation.
According to the number and power of the unknown, it can be divided into binary linear equation, binary quadratic equation, binary multivariate equation and multivariate multivariate equation.