منابع مشابه
Oscillating wildly
ome cells can induce the production of their own protective blanket. The signal comes from active neurons in the central nervous system (CNS), and triggers the differentiation of oligodendrocyte precursor cells (OPCs)—thus yielding the cells that cover the neurons with a protective sheath of myelin. Now, Beth Stevens, Douglas Fields, and colleagues (National Institutes of Health, Bethesda, MD) ...
متن کاملConfiguration Spaces for Wildly Ramified Covers
The classification for wildly ramified covers is more mysterious than for tame covers. A natural configuration space — the space of unordered branch points of a cover — for tame covers allows the construction of Hurwitz spaces, and an often very effective theory for families of tame covers. We define invariants generalizing Nielsen classes for Hurwitz families. The result is a configuration spa...
متن کاملFactorisability and the arithmetic of wildly ramified Galois extensions
© Université Bordeaux 1, 1989, tous droits réservés. L’accès aux archives de la revue « Journal de Théorie des Nombres de Bordeaux » (http://jtnb.cedram.org/) implique l’accord avec les conditions générales d’utilisation (http://www.numdam.org/legal.php). Toute utilisation commerciale ou impression systématique est constitutive d’une infraction pénale. Toute copie ou impression de ce fichier do...
متن کاملWild Bootstrap Inference for Wildly Di erent Cluster Sizes ∗
The cluster robust variance estimator (CRVE) relies on the number of clusters being large. The precise meaning of `large' is ambiguous, but a shorthand `rule of 42' has emerged. We show that this rule is invalid when clusters are not equal-sized. Monte Carlo evidence suggests that rejection frequencies can be much higher when a dataset has 50 clusters proportional to the populations of the US s...
متن کاملOn the Modularity of Wildly Ramified Galois Representations
where GQ = Gal ( Q/Q ) is the absolute Galois group of Q and ` is a fixed rational prime. For example, ρ = ρE,` may be the `-adic representation of an elliptic curve E over Q, or ρ = ρf may be the `-adic representation associated to a modular form. The continuity of such Galois representations implies the image lies in GL2(O) for some ring of integers O with maximal ideal λ in a finite extensio...
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ژورنال
عنوان ژورنال: Journal of Cell Biology
سال: 2002
ISSN: 1540-8140,0021-9525
DOI: 10.1083/jcb1601rr2