منابع مشابه
Blowing up Feynman integrals
In this talk we discuss sector decomposition. This is a method to disentangle overlapping singularities through a sequence of blow-ups. We report on an open-source implementation of this algorithm to compute numerically the Laurent expansion of divergent multi-loop integrals. We also show how this method can be used to prove a theorem which relates the coefficients of the Laurent series of dime...
متن کاملBlowing the Whistle
Leniency clauses, offering cartelists legal immunity if they blow the whistle on each other, is a recent anti-trust innovation. The authorities wish to thwart cartels and promote competition. This effect is not evident, however; whistle-blowing may enforce trust and collusion by providing a tool for cartelists to punish each other. We examine the impact of leniency law, and other rules, theoret...
متن کاملSection 2.7.1 - Blowing Up
Now we come to the generalised notion of blowing up. In (I, §4) we defined the blowing up of a variety with respect to a point. Now we will define the blowing up of a noetherian scheme with respect to any closed subscheme. Since a closed subscheme corresponds to a coherent sheaf of ideals, we may as well speak of blowing up a coherent sheaf of ideals. The necessary background for this section i...
متن کاملBlowing the pipes clean works!
We would like to congratulate Gentile and Siobal on their review article concerning the recent advances in equipment for the treatment of ventilator-associated pneumonia,1 in which they reported different techniques to clear the subglottic secretions that accumulate during intubation. At the time of extubation, they described applying a positive pressure gradient just prior to cuff deflation. T...
متن کاملSome Paradoxes of Whistle-Blowing
By "paradox" I mean an apparent—and, in this case, real—inconsistency between theory (our Systematic understanding of whistle-blowing) and the facts (what we actually know, or think we know, about whistle-blowing). What concerns me is not a few anomalies, the exceptions that test a rule, but a flood of exceptions that seems to swamp the rule. This paper has four parts. The first states the stan...
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ژورنال
عنوان ژورنال: Nature
سال: 1909
ISSN: 0028-0836,1476-4687
DOI: 10.1038/080370a0