منابع مشابه
Walker groups
A reformulation of Walker’s theorem on the cancellation of Z says that any two homomorphisms from an abelian group B onto Z have isomorphic kernels. It does not have a constructive proof, even for B a subgroup of Z3. In this paper we give a constructive proof of Walker’s theorem for B a direct sum, over any discrete index set, of groups of the following two kinds: finite-rank torsion-free group...
متن کاملThe concentration of lipids and water in skeletal muscle of albino rats bearing Walker carcinoma 256.
level of water, neutral fat, total cholesterol, free cholesterol, and phospholipid, expressed as gm/100 gm dry weight, in the carcass (host rat minus tumor) of albino rats bearing Walker car cinoma @56shifts toward the level of these dc ments in the tumor (5). These changes, which have been categorized collectively as the hydrolipo tropic shift, appear in the host carcass after @†" 4 weeks of...
متن کاملBuilding the Johnnie Walker
class discussion rather than to illustrate either effective or ineffective handling of an administrative situation. Smart of BBH for their help and support during the development of this case. Financial support from R&D INSEAD is also gratefully acknowledged.
متن کاملDandy-Walker Syndrome
Dandy-Walker Syndrome is a congenital brain defect in humans [4] characterized by malformations to the cerebellum [5], the part of the brain that controls movement, and to the ventricles, the fluid-filled cavities that surround the cerebellum [5]. The syndrome is named after physicians Walter Dandy and Arthur Walker, who described associated signs and symptoms of the syndrome in the 1900s. The ...
متن کاملBallistic random walker.
We introduce and investigate the scaling properties of a random walker that moves ballistically on a two-dimensional square lattice. The walker is scattered ~changes direction randomly! every time it reaches a previously unvisited site, and follows ballistic trajectories between two scattering events. The asymptotic properties of the density of unvisited sites and the diffusion exponent can be ...
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ژورنال
عنوان ژورنال: Science
سال: 2016
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.352.6281.49-c