Inequality: Generally speaking, pure greater than sign ">" and less than sign "are used.

Numbers in general inequalities are real numbers, and letters also represent real numbers. The general form of inequality is F(x, y, ..., z)≤G(x, y, ..., z) (where the inequality symbol can also be

Algebraic expression inequality

Both sides of the algebraic expression inequality are algebraic expressions (that is, the unknown is not on the denominator).

One-dimensional linear inequality: an unknown (that is, one dimension) and the degree of the unknown is 1 (that is, once). For example 3-X >0

Similarly, binary linear inequality: an inequality that contains two unknowns (namely binary) and the number of unknowns is 1 (namely once).