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Titlebook: Differential and Difference Dimension Polynomials; M. V. Kondratieva,A. B. Levin,E. V. Pankratiev Book 1999 Springer Science+Business Medi

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发表于 2025-3-21 18:47:28 | 显示全部楼层 |阅读模式
书目名称Differential and Difference Dimension Polynomials
编辑M. V. Kondratieva,A. B. Levin,E. V. Pankratiev
视频video
丛书名称Mathematics and Its Applications
图书封面Titlebook: Differential and Difference Dimension Polynomials;  M. V. Kondratieva,A. B. Levin,E. V. Pankratiev Book 1999 Springer Science+Business Medi
描述The role of Hilbert polynomials in commutative and homological algebra as well as in algebraic geometry and combinatorics is well known. A similar role in differential algebra is played by the differential dimension polynomials. The notion of differential dimension polynomial was introduced by E. Kolchin in 1964 [KoI64]‘ but the problems and ideas that had led to this notion (and that are reflected in this book) have essentially more long history. Actually, one can say that the differential dimension polynomial describes in exact terms the freedom degree of a dynamic system as well as the number of arbitrary constants in the general solution of a system of algebraic differential equations. The first attempts of such description were made at the end of 19th century by Jacobi [Ja890] who estimated the number of algebraically independent constants in the general solution of a system of linear ordinary differential equations. Later on, Jacobi‘s results were extended to some cases of nonlinear systems, but in general case the problem of such estimation (that is known as the problem of Jacobi‘s bound) remains open. There are some generalization of the problem of Jacobi‘s bound to the par
出版日期Book 1999
关键词Combinatorics; algebra; difference equation; number theory; partial differential equation; partial differ
版次1
doihttps://doi.org/10.1007/978-94-017-1257-6
isbn_softcover978-90-481-5141-7
isbn_ebook978-94-017-1257-6
copyrightSpringer Science+Business Media Dordrecht 1999
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发表于 2025-3-21 20:27:13 | 显示全部楼层
Numerical Polynomials,s (such polynomials are called numerical). It is shown that for any given subset . of ℤ. one may associate with . some finite family of numerical polynomials (these polynomials are called dimension polynomials of .; to a certain degree, they characterize the set . itself). The main attention is attr
发表于 2025-3-22 02:16:45 | 显示全部楼层
Differential Dimension Polynomials,re, by T we denote the set of monomials of . (see Example 4.1.6 and Definition 4.1.4), and .(.) denotes the set of monomials whose order does not exceed .. Consider on D an ascending filtration (..)., where .. = {. ∈ . | ord . ≤ .} = . ∙ .(.) for . ≥ 0, and .. = 0 for . < 0 (see Exercise 4.3.1). Bel
发表于 2025-3-22 07:04:23 | 显示全部楼层
Dimension Polynomials in Difference and Difference-Differential Algebra,Section 3.3, by the order of an element .we shall mean the number ord .and set ..= {. ∈ . | ord . = .}, .(.) = {. ∈ . | ord . ≤ .} for any . ∈ ⑅. Furthermore, let . be a ring of difference (.-) operators over the ring .. As in Chapter 3, if . (..τ ∈ . for any . ∈ . and a. = 0 for almost all . ∈ .),
发表于 2025-3-22 09:23:00 | 显示全部楼层
Some Application of Dimension Polynomials in Difference-Differential Algebra,hat . ⊇ .′,and let . be the set obtained by the adjoining of a new symbol ∞ to the set of integers ℤ. We shall consider . as a linearly ordered set whose order < is the extension of the natural order of ℤ such that . < ∞ for all . < ℤ.
发表于 2025-3-22 13:45:13 | 显示全部楼层
Dimension Polynomials of Filtered ,-Modules and Finitely Generated ,-Fields Extensions,the theorems on difference dimension polynomials and their invariants are derived. The main results of the chapter are Theorem 8.2.1 (which establishes the existence of dimension polynomial of an excellently filtered .-.-module over an artinian .-ring), Theorem 8.2.5 (this theorem describes the inva
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发表于 2025-3-23 01:15:35 | 显示全部楼层
em of linear ordinary differential equations. Later on, Jacobi‘s results were extended to some cases of nonlinear systems, but in general case the problem of such estimation (that is known as the problem of Jacobi‘s bound) remains open. There are some generalization of the problem of Jacobi‘s bound to the par978-90-481-5141-7978-94-017-1257-6
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发表于 2025-3-23 08:59:01 | 显示全部楼层
Stillness in Nature: Eeo Stubblefield’s s (such polynomials are called numerical). It is shown that for any given subset . of ℤ. one may associate with . some finite family of numerical polynomials (these polynomials are called dimension polynomials of .; to a certain degree, they characterize the set . itself). The main attention is attr
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