The document provides definitions and formulas related to algebra concepts including sets, numbers, complex numbers, factoring, products, and algebraic equations. It defines types of sets and operations on sets like union, intersection, complement and difference. It also defines types of numbers like natural numbers, integers, rational numbers, irrational numbers, real numbers and complex numbers. Formulas are given for addition, subtraction, multiplication and division of complex numbers. Other formulas presented include factoring formulas, product formulas, formulas for solving quadratic, cubic and quartic equations.