منابع مشابه
Médicos Españoles
Medicos Espanioles, by Luis S[ANCHEZ] GRANJEL,* (Estudios de Historia de la Medicina Espanola, I), Salamanca, Graficas Cervantes, 1967, pp. 374, illus., no price stated. This volume is a reprint of biographical studies on Spanish physicians published by the author over the past twenty years in different Spanish medical journals. The twentyfour subjects range from the sixteenth-century Lobera de...
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 ...
متن کاملArithmetic Multivariate Descartes' Rule Arithmetic Multivariate Descartes' Rule
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 کاملMolecular evolution of odorant-binding protein genes OS-E and OS-F in Drosophila.
The Drosophila olfactory genes OS-E and OS-F are members of a family of genes that encode insect odorant-binding proteins (OBPs). OBPs are believed to transport hydrophobic odorants through the aqueous fluid within olfactory sensilla to the underlying receptor proteins. The recent discovery of a large family of olfactory receptor genes in Drosophila raises new questions about the function, dive...
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: Scientiae Studia
سال: 2003
ISSN: 1678-3166
DOI: 10.1590/s1678-31662003000300004