In logic, the truth value of a logical statement says how much it is true. Usually, the truth value can only be "true" or "false". For example, "The car is red" is true when the car is red, and false when it is not. The "true" truth value is often written as formula_1, T or 1, and the "false" truth value as formula_2, F or 0. The truth value of a complex statement can be found using a chart called truth table.