Results 31 to 40 of about 253,823 (270)
Engel conditions and symmetric tensors [PDF]
Linear and Multilinear Algebra, 2011 In a recent study of Engel Lie rings, Serena Cicalo` and Willem de Graaf have given a practical set of conditions for an additively finitely generated Lie ring L to satisfy an Engel condition. We present a simpler and more direct proof of this fact.
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Characteristic Classes for the Degenerations of Two-Plane Fields in Four Dimensions
, 1997 There is a remarkable type of field of two-planes special to four dimensions known as an Engel distributions. They are the only stable regular distributions besides the contact, quasi-contact and line fields.
Kazarian, Maxim +2 more
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Biopsychosocial model of illnesses in primary care: A hermeneutic literature review
Journal of Family Medicine and Primary Care, 2018 Biopsychosocial model is a useful worldview for primary care or family doctors. However, it is often considered as impractical or too complicated. The objective of this study is to review the implementation of the biopsychosocial model in clinical ...
Hari Kusnanto +2 more
doaj +1 more source
Stability and Convergence of Product Formulas for Operator Matrices [PDF]
, 2012 We present easy to verify conditions implying stability estimates for operator matrix splittings which ensure convergence of the associated Trotter, Strang and weighted product formulas.
A. Bátkai +15 more
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How revealing is revealed preference? [PDF]
, 2005 This lecture address the following two key criticisms of the empirical application of revealed preference theory: When the RP conditions do not reject, they do not provide precise predictions; and when they do reject, they do not help characterize the ...
Blundell, R.
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On profinite groups with Engel-like conditions
Journal of Algebra, 2015 Let $G$ be a profinite group in which for every element $x\in G$ there exists a natural number $q=q(x)$ such that $x^q$ is Engel. We show that $G$ is locally virtually nilpotent. Further, let $p$ be a prime and $G$ a finitely generated profinite group in which for every $ _k$-value $x\in G$ there exists a natural $p$-power $q=q(x)$ such that $x^q$ is ...
Bastos, Raimundo, Shumyatsky, Pavel
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Why does the Engel method work? Food demand, economies of size and household survey methods [PDF]
, 2002 Estimates of household size economies are needed for the analysis of poverty and inequality. This paper shows that Engel estimates of size economies are large when household expenditures are obtained by respondent recall but small when expenditures are ...
Anand S. +13 more
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A transformation that preserves principal minors of skew-symmetric matrices
, 2016 Our motivation comes from the work of Engel and Schneider (1980). Their main theorem implies that two symmetric matrices have equal corresponding principal minors of all orders if and only if they are diagonally similar.
Boussaïri, Abderrahim, Chergui, Brahim
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A semigroup characterization of well-posed linear control systems [PDF]
, 2013 We study the well-posedness of a linear control system $\Sigma(A,B,C,D)$ with unbounded control and observation operators. To this end we associate to our system an operator matrix $\mathcal{A}$ on a product space $\mathcal{X}^p$ and call it $p$-well ...
Bombieri, Miriam, Engel, Klaus-Jochen
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Arthritis Care &Research, Accepted Article.Objective To support high‐quality, patient‐centered care for systemic lupus erythematosus (SLE), the American College of Rheumatology (ACR) developed evidence‐based measures incorporating clinical and patient‐reported outcomes measures (PROMs). Using the Consolidated Framework for Implementation Research (CFIR), we conducted semi‐structured interviews ...
Catherine Nasrallah +13 more
wiley +1 more source