 artifact |  atomism: 17th to 20th century |  atomism: ancient |  Boolean algebra: the mathematics of |  boundary |  chemistry, philosophy of |  identity |  identity: over time |  Leśniewski, Stanisław |  location and mereology |  logic: fuzzy |  logic and ontology |  many, problem of |  mass expressions: logic of |  mass expressions: metaphysics of |  material constitution |  mereology: medieval |  monism |  nominalism: in metaphysics |  object |  ordinary objects |  plural quantification |  propositions: structured |  set theory |  Sorites paradox |  temporal parts |  vagueness 