Ontologia czterowymiarowa a podró w czasie analiza argumentu Theodore’a Sidera (Four-dimensional ontology and time travel analysis of Theodore Sider’s argument)

The main goal of this paper is to show that Theodore Sider’s argument from time travel cannot be treated as convincing, elegant, and in favour of perdurantism. The author reconstructs and debates foundations of Sider’s perdurantist time travel scenario. A set of arguments reveals a plethora of unwelcome metaphysical consequences of this vision, including problems of: (i) identification of temporal parts, (ii) person stages and (iii) identity. Agreeing with the latter, the author acknowledges a few general comments about using the possibility of time travel in ontological debate between perdurantism and endurantism.