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Algebra i Analiz, 1994, Volume 6, Issue 1, Pages 110–126 (Mi aa426)  

This article is cited in 5 scientific papers (total in 5 papers)

Research Papers

Deviation theorems for solutions of linear ordinary differential equations and applications to parallel complexity of sigmoids

D. Yu. Grigorievab

a On leave from Mathematical Institute, St. Petersburg, RUSSIA
b Departments of Computer Science and Mathematics, Penn State University, State College, PA, USA
Abstract: By a sigmoid of depth $d$ we mean a computational circuit with $d$ layers in which rational operations are admitted at each layer, and to jump to the next layer the substitution of a function computed at the previous layer in an arbitrary real solution of a linear ordinary differential equation with polynomial coefficients is admitted. Sigmoids arise as a computational model for neural networks. We prove the deviation theorem stating that for a (real) function $f$, $f\not\equiv 0$, computed by a sigmoid of depth (or parallel complexity) $d$ there exists $c>0$ and an integer $n$ such that the inequalities. $(\exp(\dots(\exp(c|x|^n))\dots))^{-1}\leq|f(x)|\leq\exp(\dots(\exp(c|x|^n))\dots)$ hold everywhere on the real line except for a set of finite measure, where the iteration of the exponential function is taken $d$ times. One can treat the deviation theorem as an analog of the Liouville theorem (on the bound for the difference of algebraic numbers) for solutions of ordinary differential equations. Also we estimate the number of zeros of $f$ in an interval.
Keywords: Sigmoid, parallel complexity, deviation theorems, bounds for Wronskian.
Received: 13.04.1993
Bibliographic databases:
Document Type: Article
Language: English
Citation: D. Yu. Grigoriev, “Deviation theorems for solutions of linear ordinary differential equations and applications to parallel complexity of sigmoids”, Algebra i Analiz, 6:1 (1994), 110–126; St. Petersburg Math. J., 6:1 (1995), 89–106
Citation in format AMSBIB
\Bibitem{Gri94}
\by D.~Yu.~Grigoriev
\paper Deviation theorems for solutions of linear ordinary differential equations and applications to parallel complexity of sigmoids
\jour Algebra i Analiz
\yr 1994
\vol 6
\issue 1
\pages 110--126
\mathnet{http://mi.mathnet.ru/aa426}
\mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=1274966}
\zmath{https://zbmath.org/?q=an:0844.05089}
\transl
\jour St. Petersburg Math. J.
\yr 1995
\vol 6
\issue 1
\pages 89--106
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  • This publication is cited in the following 5 articles:
    Citing articles in Google Scholar: Russian citations, English citations
    Related articles in Google Scholar: Russian articles, English articles
    Алгебра и анализ St. Petersburg Mathematical Journal
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    Abstract page:273
    Full-text PDF :120
    References:1
    First page:1
     
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