Minds and Machines
Real recursive functions and their hierarchy
Journal of Complexity
A new conceptual framework for analog computation
Theoretical Computer Science
Universality, reducibility, and completeness
MCU'07 Proceedings of the 5th international conference on Machines, computations, and universality
The computational power of continuous dynamic systems
MCU'04 Proceedings of the 4th international conference on Machines, Computations, and Universality
Real Recursive Functions and Baire Classes
Fundamenta Informaticae
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We prove that the Dirichlet problem on the disc cannot be solved by the general-purpose analog computer, by constructing, on the boundary, a function u"0 that does satisfy an algebraic differential equation, but whose Poisson integral u satisfies no algebraic differential equation on some line segment inside the disc.