82,184 research outputs found
Réponse de M. Yves Cohen
No full textCohen Yves. Réponse de M. Yves Cohen. In: Bulletin de l'Académie Vétérinaire de France tome 148 n°3, 1995. pp. 233-236
On the local-indicability cohen–lyndon theorem
No full textFor a group H and a subset X of H, we let HX denote the set {hxh?1 | h ? H, x ? X}, and when X is a free-generating set of H, we say that the set HX is a Whitehead subset of H. For a group F and an element r of F, we say that r is Cohen–Lyndon aspherical in F if F{r} is a Whitehead subset of the subgroup of F that is generated by F{r}. In 1963, Cohen and Lyndon (D. E. Cohen and R. C. Lyndon, Free bases for normal subgroups of free groups, Trans. Amer. Math. Soc. 108 (1963), 526–537) independently showed that in each free group each non-trivial element is Cohen–Lyndon aspherical. Their proof used the celebrated induction method devised by Magnus in 1930 to study one-relator groups. In 1987, Edjvet and Howie (M. Edjvet and J. Howie, A Cohen–Lyndon theorem for free products of locally indicable groups, J. Pure Appl. Algebra 45 (1987), 41–44) showed that if A and B are locally indicable groups, then each cyclically reduced element of A*B that does not lie in A ? B is Cohen–Lyndon aspherical in A*B. Their proof used the original Cohen–Lyndon theorem. Using Bass–Serre theory, the original Cohen–Lyndon theorem and the Edjvet–Howie theorem, one can deduce the local-indicability Cohen–Lyndon theorem: if F is a locally indicable group and T is an F-tree with trivial edge stabilisers, then each element of F that fixes no vertex of T is Cohen–Lyndon aspherical in F. Conversely, by Bass–Serre theory, the original Cohen–Lyndon theorem and the Edjvet–Howie theorem are immediate consequences of the local-indicability Cohen–Lyndon theorem. In this paper we give a detailed review of a Bass–Serre theoretical form of Howie induction and arrange the arguments of Edjvet and Howie into a Howie-inductive proof of the local-indicability Cohen–Lyndon theorem that uses neither Magnus induction nor the original Cohen–Lyndon theorem. We conclude with a review of some standard applications of Cohen–Lyndon asphericit
Upper Cohen-Macaulay Dimension
No full textIn this paper, we define a homological invariant for finitely generated modules over a commutative noetherian local ring, which we call upper Cohen-Macaulay dimension. This invariant is quite similar to Cohen-Macaulay dimension that has been introduced by Gerko. Also we
define a homological invariant with respect to a local homomorphism of local rings. This invariant links upper Cohen-Macaulay dimension with Gorenstein dimension.</p
M. Cohen : Instructions d'enquête linguistique M. Cohen : Questionnaire linguistique
No full textGaspardone Emile. M. Cohen : Instructions d'enquête linguistique M. Cohen : Questionnaire linguistique. In: Bulletin de l'Ecole française d'Extrême-Orient. Tome 28 N°1, 1928. pp. 312-314
M. Cohen : Instructions d'enquête linguistique M. Cohen : Questionnaire linguistique
No full textGaspardone Emile. M. Cohen : Instructions d'enquête linguistique M. Cohen : Questionnaire linguistique. In: Bulletin de l'Ecole française d'Extrême-Orient. Tome 28 N°1, 1928. pp. 312-314
Stability analysis of impulsive stochastic Cohen–Grossberg neural networks with mixed time delays
No full textThis is the post print version of the article. The official published version can be obtained from the link - Copyright 2008 Elsevier LtdIn this paper, the problem of stability analysis for a class of impulsive stochastic Cohen–Grossberg neural networks with mixed delays is considered. The mixed time delays comprise both the time-varying and infinite distributed delays. By employing a combination of the M-matrix theory and stochastic analysis technique, a sufficient condition is obtained to ensure the existence, uniqueness, and exponential p-stability of the equilibrium point for the addressed impulsive stochastic Cohen–Grossberg neural network with mixed delays. The proposed method, which does not make use of the Lyapunov functional, is shown to be simple yet effective for analyzing the stability of impulsive or stochastic neural networks with variable and/or distributed delays. We then extend our main results to the case where the parameters contain interval uncertainties. Moreover, the exponential convergence rate index is estimated, which depends on the system parameters. An example is given to show the effectiveness of the obtained results.This work was supported by the Natural Science Foundation of CQ CSTC under grant 2007BB0430, the Scientific Research Fund of Chongqing Municipal Education Commission under Grant KJ070401, an International Joint Project sponsored by the Royal Society of the UK and the National Natural Science Foundation of China, and the Alexander von Humboldt Foundation of Germany
In the Age of Steel: Oral Histories from Bethlehem Pennsylvania -- Leslie M. Cohen
No full textLeslie M. Cohen (1899-November 13, 1986), born in Minneapolis, Minnesota, was the son of Joseph and Jennie Cohen, née Myers. He was married to Ada M. Cohen, née McMichael. While still in high school Cohen started as an office boy with Williamsport Wire Rope Company. Bethlehem Steel acquired the company in 1937 and Cohen served as assistant to the manager of sales for the Wire Rope and Strand Division until his retirement in 1964. In this interview he discusses the details of his work and working conditions during his tenure. This interview is part of a series of interviews conducted by Lehigh University students and faculty from 1974 through 1977 focusing on retired Bethlehem Steel workers, business people, and the heirs of industrial magnates. The project was co-sponsored by Bethlehem Steel Corporation, who provided contact information for retired steel workers. An oral history interview is an act of memory and hence both highly selective and highly subjective. While it accurately reflects what a narrator remembers (or chooses to tell) of his or her experience and viewpoints, it may not accurately represent what actually transpired or what another person may have experienced. As such users should subject interviews to the same degree of critical scrutiny they would any other historical source
Cohen, N M, VX39155
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/377918Surname: COHEN
Given Name(s) or Initials: N M
Military Service Number or Last Known Location: VX39155
Missing, Wounded and Prisoner of War Enquiry Card Index Number: 14089191732
Item: [2016.0049.10213] "Cohen, N M, VX39155
Portrait of Judy Cohen
No full textHeadshot of Judy Cohen, undated.https://mavmatrix.uta.edu/specialcollections_judithscohenresearchcollection/1264/thumbnail.jp
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