Equivalent numbers are numbers of the same value. Each type of numbers, such as fractions, decimals, or square roots, can be equal to other numbers of their type, or numbers of various kinds, as long as they have the same value. Two mathematical expressions are said to be equal if they show the same outcome after they are resolved. Two fractions are equal if the value, proportion, or quantity expressed is the same. Equivalent fractions can have different numerators and denominators. The use of the Equivalent Math uses equivalent symbols (as three bars) is used in Unicode programming for computers, as well as in Boolean algebra. Venn diagrams use the principle of logical equivalence to evaluate the relationship between two algebraic expressions and functions.