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- W4297087890 abstract "We consider the General Purpose Analog Computer (GPAC), introduced by Claude Shannon in 1941 as a mathematical model of Differential Analysers, that is to say as a model of continuous-time analog (mechanical, and later one electronic) machines of that time. We extend the model properly to a model of computation not restricted to univariate functions (i.e. functions $f: mathbb{R} to mathbb{R}$) but also to the multivariate case of (i.e. functions $f: mathbb{R}^n to mathbb{R}^m$), and establish some basic properties. In particular, we prove that a very wide class of (continuous and discontinuous) functions can be uniformly approximated over their full domain. Technically: we generalize some known results about the GPAC to the multidimensional case: we extend naturally the notion of emph{generable} function, from the unidimensional to the multidimensional case. We prove a few stability properties of this class, mostly stability by arithmetic operations, composition and ODE solving. We establish that generable functions are always analytic. We prove that generable functions include some basic (useful) generable functions, and that we can (uniformly) approximate a wide range of functions this way. This extends some of the results from cite{Sha41} to the multidimensional case, and this also strengths the approximation result from cite{Sha41} over a compact domain to a uniform approximation result over unbounded domains. We also discuss the issue of constants, and we prove that involved constants can basically assumed to always be polynomial time computable numbers." @default.
- W4297087890 created "2022-09-27" @default.
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- W4297087890 date "2016-01-21" @default.
- W4297087890 modified "2023-10-16" @default.
- W4297087890 title "On the Functions Generated by the General Purpose Analog Computer" @default.
- W4297087890 doi "https://doi.org/10.48550/arxiv.1602.00546" @default.
- W4297087890 hasPublicationYear "2016" @default.
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