DeLanda, Manuel. “Deleuze and the open-ended becoming of the world.” In Chaos/control: Complexity conference . 1998.
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With the final mathematization of classical physics in the nineteenth century, a certain picture of the world emerged dominant, one in which clockwork determinism reigned supreme and time played no creative role, so that the future was effectively closed, completely given in the past. Although the set of equations with which Hamilton was able to unify all the different fields of classical physics (mechanics, optics, and the elementary theory of electromagnetism) did contain a variable for time, this variable played only an extrinsic role: once the equations were defined for a specific instant, both the past and the future were completely determined, and could be obtained mechanically by simply integrating the equations. To be sure, this static, timeless picture of reality did not go unchallenged within science, since thermodynamics had already introduced an arrow of time which conflicted with the symmetric conception of classical mechanics, where the past and the future were interchangeable. Nevertheless, as the history of statistical mechanics makes it clear, much scientific effort has been spent in our century to reconcile time asymmetry at the level of large aggregates with the still accepted time symmetry at the level of individual interactions.