In it, facts of the real world are represented by sentences without arguments. A proposition will never be both true and false at the same time. Principles that must always be obeyed: Principle of ...

Propositional logic is a branch of logic that deals with statements that are either true or false, and how they can be combined using logical operators such as and, or, not, if-then, and if-and ...

Here are some example propositions. 34043 is the sum of two square numbers. The square root of 2 is not a rational number. 1111111111111111111 is a prime number. The Riemann hypothesis is false. 25 is ...