منابع مشابه
Mendel's demon
on the shelves of any evolutionary biologist or student of the subject and you are likely to see a textbook by Mark Ridley. But Ridley, formerly at Emory University in Atlanta, and now in Oxford, has had another book in his mind for quite some time. He believes there are some ideas sparked by the Austrian monk, Gregor Mendel, that are of broader interest and has set out to explore some of them ...
متن کاملThe Descartes Rule of Sweeps and the Descartes Signature
The Descartes Rule of Signs, which establishes a bound on the number of positive roots of a polynomial with real coefficients, is extended to polynomials with complex coefficients. The extension is modified to bound the number of complex roots in a given direction on the complex plane, giving rise to the Descartes Signature of a polynomial. The search for the roots of a polynomial is sometimes ...
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Let L be any number field or p-adic field and consider F := (f1, . . . , fk) where fi∈L[x ±1 1 , . . . , x ±1 n ]\{0} for all i and there are exactlym distinct exponent vectors appearing in f1, . . . , fk. We prove that F has no more than 1+ ( σm(m− 1)2n2 logm )n geometrically isolated roots in Ln, where σ is an explicit and effectively computable constant depending only on L. This gives a sign...
متن کاملMaxwell’s Demon
This problem is prob. 2 of [1]. One of the earliest conceptual “supercomputers” was Maxwell’s Demon [2], who uses intelligence in sorting molecules to appear to evade the Second Law of Thermodynamics. To place the demon in a computational context, consider a computer “memory” that consists of a set of boxes (bits), each of volume V and each containing a single molecule. A (re)movable partition ...
متن کامل7 Descartes ’ Perfect Lens
We give a new, elementary, purely analytical development of Descartes’ theorem that a smooth connected surface is a perfect focusing lens if and only if it is a connected subset of the ovoid obtained by revolving a cartesian oval around its axis of symmetry.
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ژورنال
عنوان ژورنال: Theory & Psychology
سال: 2006
ISSN: 0959-3543,1461-7447
DOI: 10.1177/0959354306070527