Deviant logic is a logic branch which are made up of by denying or modifying some basic principles of classical logic, including Intuitionism Logic, Many-Valued Logic, etc.

• 变异逻辑是由否定或修改经典逻辑的某些基本假定而形成的逻辑分支，包括直觉主义逻辑，多值逻辑等。