Law of noncontradiction

The law of noncontradiction is a rule of logic, it means that if something is true, its opposite is false, an example of this is if a red car is parked outside a building, it is not true that at the same time and in the same sense, a red car is not parked outside the building. Aristotle stated it in this way, that "The most certain opinion of all" was "that opposed statements cannot be at the same time true."