Being and Nothingness by Jean-Paul Sartre is a philosophical treatise that examines the nature of being and nothingness. It is considered one of the most influential works of 20th century philosophy and is a cornerstone of existentialism. The book explores the fundamental questions of existence, such
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Being and Nothingness: An Essay on Phenomenological Ontology, sometimes published with the subtitle A Phenomenological Essay on Ontology, is a 1943 book by the philosopher Jean-Paul Sartre. In the book, Sartre develops a philosophical account in support of his existentialism, dealing with topics such as consciousness, perception, social philosophy, self-deception, the existence of "nothingness", psychoanalysis, and the question of free will.