 Dictum de omni et nullo

"Dictum de omni et nullo" is a Latin phrase that translates to "the saying about all and none." It is a principle from medieval scholastic philosophy and logic, particularly associated with the works of Peter Abelard and later in discussions of categorical logic. The principle addresses the scope of quantification in logical statements and can be understood as dealing with the relationships between universal affirmative (all) and universal negative (none) statements.