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This document discusses the Buddhist philosophical concept of Catuṣkoṭi and how it relates to logic, set theory, and quantum mechanics. Catuṣkoṭi considers four possibilities - A, not A, both A and not A, and neither A nor not A. This differs from binary Aristotelian logic. The document uses examples from the King Devadatta story and set theory to illustrate issues resolved by Catuṣkoṭi but not binary logic. It argues that developments in quantum mechanics support concepts expressed by Catuṣkoṭi, suggesting it remains relevant despite claims it is dead. References for further information on Catuṣkoṭi and relatedRead less