French philosopher Alain Badiou (b. 1937) is one of the more important European thinkers to emerge after May 1968. His work may be read as a response to the structuralism, post-structuralism, existentialism, and postmodern thought characteristic of post-World War II French theory. Through the use of set theory, he argues that our understanding of reality is largely determined by major, world shifting events in politics, mathematics/science, aesthetics/poetry, and love. A Maoist, he maintains that true changes in human reality require decisive interventions that create a new sense of temporality, subjectivity, and order. Events radically change the order of an existing world and create new worlds. For example, the Russian or French revolutions brought an end to absolutist monarchies and the rule that were specific to them. A new order and form of political power were introduced by the ascendant regimes. The sense of who and what human beings living under such regimes were changed from that of subject to citizen. The idea of subjects being absolutely ruled and determined by divine monarchs only responsible to God and themselves would no longer be possible as a legitimate form of political rule. The contents and relations constitutive of a world come to be structured by the event, though the worlds regimented by an event are never identical to the event itself. The event always lies outside, though it conditions, the sets of relations and contents that express it. His work is often read in conjunction with and in opposition to the philosopher Jacques Rancière. Both thinkers form part of what is seen as the new constructivism and universalism.