Theory that an object does not exist except only as different "time slices"
Perdurantism or perdurance theory is a philosophical theory of persistence and identity.[1] The debate over persistence currently involves three competing theories—one three-dimensionalist theory called "endurantism" and two four-dimensionalist theories called
"perdurantism" and "exdurantism". For a perdurantist, all objects are considered to be four-dimensional worms and they make up the different regions of spacetime. It is a fusion of all the perdurant's instantaneous time slices
compiled and blended into a complete mereological whole. Perdurantism posits that temporal parts alone are what ultimately change. Katherine Hawley in How Things Persist states that change is "the possession of different properties by different temporal parts of an object".[2]
Take any perdurant and isolate a part of its spatial region. That isolated spatial part has a corresponding temporal part to match it. We can imagine an object, or four-dimensional worm: an apple. This object is not just spatially extended but temporally extended. The complete view of the apple includes its coming to be from the blossom, its development, and its final decay. Each of these stages is a temporal time slice of the apple, but by viewing an object as temporally extended, perdurantism views the object in its entirety.
The use of "endure" and "perdure" to distinguish two ways in which an object can be thought to persist can be traced to David Kellogg Lewis (1986). However, contemporary debate has demonstrated the difficulties in defining perdurantism (and also endurantism). For instance, the work of Ted Sider (2001) has suggested that even enduring objects can have temporal parts, and it is more accurate to define perdurantism as being the claim that objects have a temporal part at every instant that they exist. Currently there is no universally acknowledged definition of perdurantism.[a] Others argue that this problem is avoided by creating time as a continuous function, rather than a discrete one.
Perdurantism is also referred to as "four-dimensionalism" (by Ted Sider, in particular) but perdurantism also applies if one believes there are temporal but non-spatial abstract entities (like immaterial souls or universals of the sort accepted by David Malet Armstrong).[3]
^Temporal parts – Stanford Encyclopedia of Philosophy
^Hawley, Katherine (2004-09-30). How Things Persist. Oxford University Press. p. 12. ISBN 978-0-19-927543-4.
^Brian Garrett (2011). What Is This Thing Called Metaphysics?. Taylor & Francis. pp. 54–55. ISBN 978-1-136-79269-4.
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