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...guments, that is, for each [[valuation (logic)|combination of values taken by their logical variables]].<ref>{{harvnb|Enderton|2001}}</ref> In particular ...2307/2182631}}</ref> Such a system was also independently proposed in 1921 by [[Emil Leon Post]].<ref>{{cite journal | author-link=Emil Post |first=Emil ...

...The Oxford Handbook of the History of Physics|url=https://books.google.com/books?id=1SxoAgAAQBAJ&pg=PA128|date=10 October 2013|publisher=OUP Oxford|isbn=978 [[File:Conic Sections.svg|thumb|240px|right|Mathematics was developed by the Ancient Civilizations for intellectual challenge and pleasure. Surprisi ...