 change: and inconsistency |  essential vs. accidental properties |  identity |  identity: of indiscernibles |  identity: over time |  identity: relative |  identity: transworld |  intrinsic vs. extrinsic properties |  Lewis, David: metaphysics |  location and mereology |  logic: temporal |  many, problem of |  material constitution |  mereology |  metaphysics |  object |  ordinary objects |  personal identity |  personal identity: and ethics |  possible objects |  space and time: being and becoming in modern physics |  time |  time: the experience and perception of |  vagueness 