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CCA
2009
Springer
13 years 11 months ago
Real Computation with Least Discrete Advice: A Complexity Theory of Nonuniform Computability
It is folklore particularly in numerical and computer sciences that, instead of solving some general problem f : A → B, additional structural information about the input x ∈ A ...
Martin Ziegler
CCA
2009
Springer
13 years 11 months ago
Uniqueness, Continuity, and Existence of Implicit Functions in Constructive Analysis
We extract a quantitative variant of uniqueness from the usual hypotheses of the implicit functions theorem. This leads not only to an a priori proof of continuity, but also to an ...
Hannes Diener, Peter Schuster
CCA
2009
Springer
13 years 11 months ago
Realisability and Adequacy for (Co)induction
Abstract. We prove the correctness of a formalised realisability interpretation of extensions of first-order theories by inductive and coinductive definitions in an untyped λ-ca...
Ulrich Berger
CCA
2009
Springer
13 years 11 months ago
Random Iteration Algorithm for Graph-Directed Sets
Abstract. A random iteration algorithm for graph-directed sets is defined and discussed. Similarly to the Barnsley-Elton’s theorem, it is shown that almost all sequences obtaine...
Yoshiki Tsujii, Takakazu Mori, Mariko Yasugi, Hide...
CCA
2009
Springer
13 years 11 months ago
Curves That Must Be Retraced
We exhibit a polynomial time computable plane curve Γ that has finite length, does not intersect itself, and is smooth except at one endpoint, but has the following property. For...
Xiaoyang Gu, Jack H. Lutz, Elvira Mayordomo
CCA
2009
Springer
13 years 11 months ago
Towards the Complexity of Riemann Mappings (Extended Abstract)
d Abstract) Robert Rettinger1 Department of Mathematics and Computer Science University of Hagen, Germany Abstract. We show that under reasonable assumptions there exist Riemann ma...
Robert Rettinger
CCA
2009
Springer
13 years 11 months ago
Weihrauch Degrees, Omniscience Principles and Weak Computability
Abstract. In this paper we study a reducibility that has been introduced by Klaus Weihrauch or, more precisely, a natural extension of this reducibility for multi-valued functions ...
Vasco Brattka, Guido Gherardi
CCA
2009
Springer
13 years 11 months ago
Relativizations of the P =? DNP Question for the BSS Model
We consider the uniform BSS model of computation where the machines can perform additions, multiplications, and tests of the form x ≥ 0. The oracle machines can also check whethe...
Christine Gaßner
CCA
2009
Springer
13 years 11 months ago
Computability of Probability Distributions and Distribution Functions
We define the computability of probability distributions on the real line as well as that of distribution functions. Mutual relationships between the computability notion of a pro...
Takakazu Mori, Yoshiki Tsujii, Mariko Yasugi