 Aquinas, Thomas |  Aristotle |  Boethius, Anicius Manlius Severinus |  Buridan, John [Jean] |  Duns Scotus, John |  Ibn Sina [Avicenna] |  Kilwardby, Robert |  -->Latin Averroism--> |  logic: modal |  medieval philosophy |  Ockham [Occam], William |  possible worlds |  Stoicism |  terms, properties of: medieval theories of 