Results 81 to 90 of about 563,270 (278)
Geophysical Monograph Series, Page 1-26., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Richard E. Ernst +8 more
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Weakly continuous accretive operators [PDF]
Bulletin of the American Mathematical Society, 1973 where A is a weakly continuous possibly nonlinear operator mapping a reflexive Banach space X to itself. Recently S. Chow and J. D. Schuur [2] have considered existence theory for ordinary differential equations involving weakly continuous operators on separable, reflexive Banach spaces.
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Journal of the Royal Anthropological Institute, EarlyView.Over the last 25 years, perceptions of the early prehistory of Northwest Africa have undergone radical changes due to new fieldwork projects and a corresponding growth in scientific interest in the region. Much of this work has been focused in Morocco, known for its extremely rich fossil and archaeological records in caves and rock shelters.
Nick Barton +3 more
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Polynomially accretive operators
Hacettepe Journal of Mathematics and StatisticsIn this paper, we introduce a new class of operators on a complex Hilbert space $\mathcal{H}$ which is called polynomially accretive operators, and thereby extending the notion of accretive and $n$-real power positive operators. We give several properties of the newly introduced class, and generalize some results for accretive operators.
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Journal of the Royal Anthropological Institute, EarlyView.Recent archaeological discoveries, reviewed in this essay, challenge traditional views on the emergence of human symbolic cognition. Once believed to have originated in Europe around 40,000 years ago, new evidence shows it emerged much earlier across diverse regions.
Francesco d'Errico +3 more
wiley +1 more source
ON ITERATIVE CONVERGENCE OF RESOLVENTS OF ACCRETIVE OPERATORS
Demonstratio Mathematica, 2004 For solving the inclusion \(0 \in Ax\) for an accretive operator \(A\) on a real Banach space, the author considers iterations \(x_{n+1} = \alpha_n x_n + (1 - \alpha_n) y_n\), where \(y_n\) is an approximation of \((I + r A)^{-1}x_n\) in a given closed convex set. Weak and strong convergence results are proved and the method is applied to equations \(x
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Journal of the Royal Anthropological Institute, EarlyView.The ‘Out of Africa’ model that has dominated palaeoanthropology for nearly three decades was originally based on five elements: a recent ancestry to human populations; an African origin for the ancestral population; limited or no gene flow among archaic hominins and no admixture between modern humans and Neanderthals; a marked difference between the ...
Robert A. Foley, Marta Mirazón Lahr
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On the eigenvalues which express antieigenvalues
International Journal of Mathematics and Mathematical Sciences, 2005 We showed previously that the first antieigenvalue and the components of the first antieigenvectors of an accretive compact normal operator can be expressed either by a pair of eigenvalues or by a single eigenvalue of the operator.
Morteza Seddighin, Karl Gustafson
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Best Proximity Point for the Sum of Two Non-Self-Operators
Journal of Mathematics, 2020 In the present paper, we focus our attention on the existence of the fixed point for the sum of the cyclic contraction and the noncyclic accretive operator. Also, we study the best proximity point for the sum of two non-self-mappings.
V. Pragadeeswarar, R. Gopi, M. De la Sen
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International Journal of Urban and Regional Research, EarlyView.Abstract Foregrounding the role of finance, this article examines the historical production and future trajectory of the urban water crisis in Mombasa. Drawing on archival research and contemporary fieldwork, it traces how principles of full cost recovery—institutionalized during the colonial period and later reworked through postcolonial ...
Joe Williams
wiley +1 more source