منابع مشابه
Evolution's forgotten anniversary
While many organisations are gearing up to celebrate the double evolution anniversary next year — 150 years since the first publication of Charles Darwin's Origin of Species and 200 years since his birth — an event of major significance has its 150 anniversary this year but is set to receive little public celebration. By 1858 Darwin was well-established in his home at Down House in Kent and dee...
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The importance of the notion of symmetry in quantum theory cannot be overstimated [1]. The associated statespace decomposition into dynamically invariant sectors is a highly desirable property in that it can strongly simplify the analysis of the system evolution. Suppose that on the state-space H of a quantum system S acts a group G via a representation ρ. In general the Hamiltonian H of S is n...
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This article gives a short presentation of random evolutions. At first, the following two examples are presented: dynamical stochastic systems and increment processes both in Markov media. After, an introduction to semi-Markov Random evolution in a Banach space is given, where the previous evolutionary systems are obtained as particular cases. Finally, two abstract limit theorems of average and...
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A member of a class of evolution systems is defined by averaBing a oneparameter family of invertible transformations G with a semigroup T The resulting evolution system, U(t,s) G(t)T(t-s)G(s) -1, preserves continuity and strong continuity, and in case G is a linear family, may have an identifiable generator and resolvent both of which are constructed from T. Occurrences of the class of evolutio...
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Using text previewers to browse code and documentation has uncovered some of the basic limitations of classical typesetting systems. Problems arise from the use of embedded markup, the reliance on context-free grammars, and monolithic typesetter design. Some aspects of each of these problems are discussed. A typesetter architecture is proposed that does not require markup or grammars, and that ...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2008
ISSN: 0960-9822
DOI: 10.1016/j.cub.2008.04.003