3 resultados para Beth Evans

em Boston University Digital Common


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http://www.archive.org/details/jamesevans00maclrich

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Excellent laboratory procedure for a small focused library of dihydropyrimidinones. Good example of a multicomponent reaction performed using microwave irradiation.

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We give an explicit and easy-to-verify characterization for subsets in finite total orders (infinitely many of them in general) to be uniformly definable by a first-order formula. From this characterization we derive immediately that Beth's definability theorem does not hold in any class of finite total orders, as well as that McColm's first conjecture is true for all classes of finite total orders. Another consequence is a natural 0-1 law for definable subsets on finite total orders expressed as a statement about the possible densities of first-order definable subsets.