According to the Stanford Encyclopedia of Philosophy, the term postmodernism originated in 1979 with the publication of Jean Francois Lyotard's "The Postmodern Condition." Key influences include the writings of Friedrich Nietzsche, Jacques Lacan and Soren Kierkegaard.
Postmodernists believe that all truth is approximate and in a constant state of evolution, and that no theory can ever be proved true.
Postmodernism philosophy is described as a set of strategic, rhetorical and critical practices that utilize concepts such as repetition, difference and hyper reality to weaken other philosophical concepts.
Postmodernism is notoriously difficult to describe or define, and critics of the movement argue that postmodernists use extensive jargon to hide the triviality of their writings.
Well-known postmodern philosophers include Jean-Francois Lyotard, Jean Baudrillard, Richard Rorty, Michel Foucault and Jacques Derrida.