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The general purpose analog computer and recursive functions over the reals

Authors: Graça, Daniel;

The general purpose analog computer and recursive functions over the reals

Abstract

Pretende-se analisar na presente dissertação diversos modelos matemáticos de computação analógica. Começa-se por analisar o primeiro modelo conhecido deste tipo, o Computador Analógico (GPAC, abreviatura do inglês). São descritos os principais resultados existentes para este modelo, sendo também apresentada uma abordagem alternativa. É mostrado que esta nova abordagem origina um modelo mais robusto que o GPAC, mantendo, no entanto, as suas principais propriedades, tais como a equivalência com funções diferencialmente algébricas. Introduzem-se também novos conceitos que julgamos relevantes, tais como o procedimento de inicializaºão e a noção de GPAC efectivo. Seguidamente, o nosso estudo incide sobre a teoria das funções reais recursivas, uma teoria análoga à teoria clássica das funções recursivas, em que as funções são consideradas sobre o conjunto dos reais, em vez do conjunto dos naturais. Prop˜oem-se novas classes de funções, relacionando-se estas com as principais classes da teoria clássica, incluindo a Hierarquia Aritm´etica. Além disso, mostram-se ainda relações entre as funções reais recursivas e funções geradas por modelos semelhantes ao GPAC.

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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