Analytic philosophy
Philosophy of time

Analytic philosophy of time traces its roots to the British idealist J. M. E. McTaggart 's article " The Unreality of Time " (1908). In it, McTaggart distinguishes between the dynamic, A-, or tensed, theory of time (past, present, future), in which time flows; and the static or tenseless B-theory of time (earlier than, simultaneous with, later than). Eternalism holds that past, present, and future are equally real. In contrast, Presentism holds that only entities in the present exist.

The theory of special relativity seems to advocate a B-theory of time. David Lewis's perdurantism, or four-dimensionalism, requires a B-theory of time. A. N. Prior, who invented tense logic, advocated the A-theory of time.
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