منابع مشابه
NOT ALL FREE ARRANGEMENTS ARE K ( n , 1 ) PAUL
We produce a one-parameter family of hyperplane arrangements that are counterexamples to the conjecture of Saito that the complexified complement of a free arrangement is K(n, 1 ). These arrangements are the restriction of a one-parameter family of arrangements that arose in the study of tilings of certain centrally symmetric octagons. This other family is discussed as well. I. Definitions and ...
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With more and more electronic information sources becoming widely available, the issue of the quality of these often-competing sources has become germane. We propose a standard for rating information products with respect to their quality, and we show how to estimate the quality of answers issued by databases from the quality speciications that have been assigned to these databases. The annotat...
متن کاملComplex Reflection Arrangements Are K ( Π , 1 )
Let V be a finite dimensional complex vector space and W ⊆ GL(V ) be a finite complex reflection group. Let V reg be the complement in V of the reflecting hyperplanes. We prove that V reg is a K(π, 1) space. This was predicted by a classical conjecture, originally stated by Brieskorn for complexified real reflection group. The complexified real case follows from a theorem of Deligne and, after ...
متن کاملAll opinions are not equal.
To the Editor: Gibbons et al1 detail the “noble” and Herculean task of developing American College of Cardiology/American Heart Association cardiovascular guidelines. Recommendations are based on either experimental results or opinion, with the latter being considered of uniformly lower evidentiary importance. The contribution of opinion to the guidelines is substantial in that opinion supports...
متن کاملNot all laboratories are alike.
KLUG et al. [1] have reported observer variability within and between two experienced observers of a number of lung function measurements in preschool children. One of the methods assessed was the measurement of airway resistance by the interrupter technique (Rint). In their laboratory, Rint measurements have high interobserver variability, although no systematic bias. In our laboratory interob...
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ژورنال
عنوان ژورنال: Bulletin of the American Mathematical Society
سال: 1995
ISSN: 0273-0979
DOI: 10.1090/s0273-0979-1995-00557-4