 Aristotle, General Topics: metaphysics |  Continental Rationalism |  Descartes, René: modal metaphysics |  evil: problem of |  fictionalism: modal |  identity: of indiscernibles |  identity: transworld |  Kant, Immanuel: and Leibniz |  Leibniz, Gottfried Wilhelm |  Leibniz, Gottfried Wilhelm: ethics |  Leibniz, Gottfried Wilhelm: on causation |  Leibniz, Gottfried Wilhelm: on the problem of evil |  Leibniz, Gottfried Wilhelm: philosophy of mind |  Leibniz, Gottfried Wilhelm: philosophy of physics |  logic, history of: modal logic |  logic: modal |  metaphysics |  modality: epistemology of |  modality: medieval theories of |  multi-modal logic, philosophical aspects of |  Newton, Isaac: philosophy |  possibilism-actualism debate |  possible objects |  quantum mechanics: modal interpretations of |  Spinoza, Baruch: modal metaphysics 