Numerous thinkers have considered the Principle of Non-Contradiction, but none has clearly identified its inherent limitation: that it is itself only a formal principle.

This book shows that negation plays a fundamental role both in the constitution of the principle and in the affirmation of its value, which consists in its undeniability. Since it is a formal negation, it is extrinsic to the negated in such a way that it is configured as a negation only insofar as it is applied to something.

On the basis of this analysis, it is shown that it is possible to reverse the usual...