Article by Don Faust presented at the 20th World Congress of Philosophy.

A dialetheia is a true contradiction, a statement, A, such that both it and its negation, A, are true. Hence, dialeth(e)ism is the view that there are true contradictions. Dialetheism opposes the so-called Law of Non-Contradiction. By Graham Priest, from the Stanford Encyclopedia.

Article by M.E. Orellana Benado, A. Bobenrieth and C. Verdugo. Presented at the 20th World Congress of Philosophy.

The development of paraconsistent logic was initiated in order to challenge the logical principle that anything follows from contradictory premises, ex contradictione quodlibet. By Koji Tanaka, from the Stanford Encyclopedia.

Paper by Reinhard Muskens on logical systems in which the principle of bivalence and the principle of non-contradiction fail.