 Dialetheism is the view that there are dialetheias. If we define a  contradiction  as a couple of sentences, one of which is the negation of the other, or as a conjunction of such sentences, then dialetheism amounts to the claim that there are true contradictions. As such, dialetheism opposes—contradicts—the Law of Non-Contradiction (LNC), sometimes also called the Law of Contradiction. The Law can be expressed in various ways; fixing the precise formulation is itself a topic of debate (Priest et al 2004, Part II). Thomas Reid put the LNC in the form ‘No proposition is both true and false’. A strong (modal) statement of the LNC is: for any \(A\), it is impossible that both \(A\) and \(\neg A\) be true. 