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Nov 23, 2009 at 15:50 comment added Jon Awbrey Hey! That makes a good motto: MK, Non Plus Ultra!
Nov 23, 2009 at 15:17 comment added Mike Shulman This is the axiom system usually called MK, for "Morse-Kelley" (this being the Kelley, and presumably the Morse being the one he refers to).
Nov 23, 2009 at 14:22 history answered Jon Awbrey CC BY-SA 2.5