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William Wistar Comfort
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  • The Theory of Ultrafiltersby William Wistar Comfort; S. Negrepontis

    Springer Berlin Heidelberg 2012; US$ 89.86

    An ultrafilter is a truth-value assignment to the family of subsets of a set, and a method of convergence to infinity. From the first (logical) property arises its connection with two-valued logic and model theory; from the second (convergence) property arises its connection with topology and set theory. Both these descriptions of an ultrafilter are... more...

  • Four Arthurian Romancesby Chretien de Troyes; William Wistar Comfort

    The Floating Press 1914; US$ 6.99

    Chrétien de Troyes' Four Arthurian Romances continued and expanded on existing Arthurian legends, but began the Arthurian Romance genre, so popular in Medieval literature. His tales often diverge from Arthur himself, focussing instead on the characters of his court. Chretien introduced Sir Lancelot and also the Holy Grail to the Arthurian... more...

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