10 Search Results for "Rump, Siegfried M."


Document
Reliable Computation and Complexity on the Reals (Dagstuhl Seminar 17481)

Authors: Norbert T. Müller, Siegfried M. Rump, Klaus Weihrauch, and Martin Ziegler

Published in: Dagstuhl Reports, Volume 7, Issue 11 (2018)


Abstract
Naive computations with real numbers on computers may cause serious errors. In traditional numerical computation these errors are often neglected or, more seriously, not identified. Two approaches attack this problem and investigate its background, Reliable Computing and Computable Analysis. Methods in Reliable Computing are essentially mathematical theorems, the assumptions of which are verified on the computer. This verification is performed using the very efficient floating point arithmetic. If the verification succeeds, the assertions are true and correct error bounds have been computed; if not, a corresponding message is given. Thus the results are always mathematically correct. A specific advantage of Reliable Computing is that imprecise data are accepted; the challenge is to develop mathematical theorems the assumptions of which can be verified effectively in floating-point and to produce narrow bounds for the solution. Computable Analysis extends the traditional theory of computability on countable sets to the real numbers and more general spaces by refining continuity to computability. Numerous even basic and simple problems are not computable since they cannot be solved continuously. In many cases computability can be refined to computational complexity which is the time or space a Turing machine needs to compute a result with given precision. By treating precision as a parameter, this goes far beyond the restrictions of double precision arithmetic used in Reliable computing. For practical purposes, however, the asymptotic results from complexity theory must be refined. Software libraries provide efficient implementations for exact real computations. Both approaches are established theories with numerous important results. However, despite of their obvious close relations these two areas are developing almost independently. For exploring possibilities of closer contact we have invited experts from both areas to this seminar. For improving the mutual understanding some tutorial-like talks have been included in the program. As a result of the seminar it can be stated that interesting joint research is possible.

Cite as

Norbert T. Müller, Siegfried M. Rump, Klaus Weihrauch, and Martin Ziegler. Reliable Computation and Complexity on the Reals (Dagstuhl Seminar 17481). In Dagstuhl Reports, Volume 7, Issue 11, pp. 142-167, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)


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@Article{muller_et_al:DagRep.7.11.142,
  author =	{M\"{u}ller, Norbert T. and Rump, Siegfried M. and Weihrauch, Klaus and Ziegler, Martin},
  title =	{{ Reliable Computation and Complexity on the Reals (Dagstuhl Seminar 17481)}},
  pages =	{142--167},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2018},
  volume =	{7},
  number =	{11},
  editor =	{M\"{u}ller, Norbert T. and Rump, Siegfried M. and Weihrauch, Klaus and Ziegler, Martin},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagRep.7.11.142},
  URN =		{urn:nbn:de:0030-drops-86826},
  doi =		{10.4230/DagRep.7.11.142},
  annote =	{Keywords: Computable Analysis, Verification Methods, Real Complexity Theory, Reliable Computing}
}
Document
09471 Abstracts Collection – Computer-assisted proofs - tools, methods and applications

Authors: Malcolm B. Brown, Erich Kaltofen, Shin'ichi Oishi, and Siegfried M. Rump

Published in: Dagstuhl Seminar Proceedings, Volume 9471, Computer-assisted proofs - tools, methods and applications (2010)


Abstract
From 15.11. to 20.11.2009, the Dagstuhl Seminar 09471 ``Computer-assisted proofs - tools, methods and applications '' was held in Schloss Dagstuhl~--~Leibniz Center for Informatics. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available.

Cite as

Malcolm B. Brown, Erich Kaltofen, Shin'ichi Oishi, and Siegfried M. Rump. 09471 Abstracts Collection – Computer-assisted proofs - tools, methods and applications. In Computer-assisted proofs - tools, methods and applications. Dagstuhl Seminar Proceedings, Volume 9471, pp. 1-24, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)


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@InProceedings{brown_et_al:DagSemProc.09471.1,
  author =	{Brown, Malcolm B. and Kaltofen, Erich and Oishi, Shin'ichi and Rump, Siegfried M.},
  title =	{{09471 Abstracts Collection – Computer-assisted proofs - tools, methods and applications}},
  booktitle =	{Computer-assisted proofs - tools, methods and applications},
  pages =	{1--24},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{9471},
  editor =	{B. Malcolm Brown and Erich Kaltofen and Shin'ichi Oishi and Siegfried M. Rump},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.09471.1},
  URN =		{urn:nbn:de:0030-drops-25328},
  doi =		{10.4230/DagSemProc.09471.1},
  annote =	{Keywords: Verification methods, computer algebra, computer-assisted proofs}
}
Document
09471 Executive Summary – Computer-assisted proofs - tools, methods and applications

Authors: Malcolm B. Brown, Erich Kaltofen, Shin'ichi Oishi, and Siegfried M. Rump

Published in: Dagstuhl Seminar Proceedings, Volume 9471, Computer-assisted proofs - tools, methods and applications (2010)


Abstract
From November 15-20, 2009, the Dagstuhl seminar on "Computer-assisted proofs - tools, methods and applications" continued a series of previous successful seminars. Participants from 10 different countries presented recent results in verification methods, computer algebra, and other computer-assisted-proof related areas. We had lively talks and discussions, during the regular times for talks, during meals and afterwards. In the following links to abstracts and/or the presentation are given were applicable.

Cite as

Malcolm B. Brown, Erich Kaltofen, Shin'ichi Oishi, and Siegfried M. Rump. 09471 Executive Summary – Computer-assisted proofs - tools, methods and applications. In Computer-assisted proofs - tools, methods and applications. Dagstuhl Seminar Proceedings, Volume 9471, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)


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@InProceedings{brown_et_al:DagSemProc.09471.2,
  author =	{Brown, Malcolm B. and Kaltofen, Erich and Oishi, Shin'ichi and Rump, Siegfried M.},
  title =	{{09471 Executive Summary – Computer-assisted proofs - tools, methods and applications}},
  booktitle =	{Computer-assisted proofs - tools, methods and applications},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{9471},
  editor =	{B. Malcolm Brown and Erich Kaltofen and Shin'ichi Oishi and Siegfried M. Rump},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.09471.2},
  URN =		{urn:nbn:de:0030-drops-25316},
  doi =		{10.4230/DagSemProc.09471.2},
  annote =	{Keywords: Verification methods, computer algebra, computer-assisted proofs}
}
Document
Interval Approaches to Reliable Control of Dynamical Systems

Authors: Andreas Rauh and Ekaterina Auer

Published in: Dagstuhl Seminar Proceedings, Volume 9471, Computer-assisted proofs - tools, methods and applications (2010)


Abstract
Recently, we presented an implementation of interval-based algorithms which can be applied in real-time to control dynamical processes and to estimate internal states and disturbances. The approach is based on verified methods for sets of algebraic equations, ordinary differential equations as well as differential-algebraic equations. Due to this fact, the same program code can be used for two different tasks. On the one hand, we can use it online to estimate non-measurable internal system states which are necessary for nonlinear model-based control strategies. On the other hand, we can verify the admissibility and feasibility of these control strategies offline. Although we use the same code for the online and offline tasks, there is an important difference between them. While the computing time is of minor importance in offline applications, we have to guarantee that the necessary online computations are completed successfully in a predefined time interval. For that reason, the role of verification is slightly different depending on the task. In offline applications, our goal is to compute tightest possible bounds for the sets of all solutions to the control problem under consideration. In contrast to that, we restrict the online mode to a search for a single solution that matches all demands on feasibility of control inputs and admissibility of the trajectories of the state variables in a reliable way. To highlight the practical applicability of the underlying computational routines, we present the following cases for the use of verified solvers in real-time [1-3]. Case 1: Direct computation of feedforward control strategies with the help of differential-algebraic equation solvers. In this application, both verified and non-verified solvers can be used to determine open-loop control strategies for a dynamical system such that its output coincides with a predefined time response within given tolerances. This procedure corresponds to a numerical inversion of the dynamics of the system to be controlled. In this case, verified solvers are used to prove the existence of a control law within given physical bounds for the admissible range of the system inputs. Case 2: If measured data and their time derivatives are available, the same procedures as in case 1 can be used to estimate non-measured state variables as well as non-measurable disturbances. Since the verified algorithms used in this context are capable of propagating bounded measurement uncertainties, the quality of the state and disturbance estimates can be expressed in terms of the resulting interval widths. Moreover, assumptions about the parameters and the structure of the underlying model can be verified. Case 3: Routines for verified sensitivity analysis provide further information on the influence of variations of control inputs on the trajectories of the state variables. We present novel procedures implementing a sensitivity-based framework for model-predictive control. These procedures can be integrated directly in a feedback control structure. Sometimes it is necessary to combine verified and non-verified algorithms to solve a given control problem. In this case, it is important to certify the results of the algorithm appropriately. Based on the four-tier hierarchy presented in earlier works [4], we develop a measure for characterizing such mixed approaches. The presentation is concluded with simulation and experimental results for the example of temperature control of a distributed heating system. [1] Rauh, Andreas; Auer, Ekaterina: Applications of Verified DAE Solvers in Engineering, Intl. Workshop on Verified Computations and Related Topics, COE Lecture Note Vol. 15: Kyushu University, pp. 88-96, Karlsruhe, Germany, 2009. [2] Rauh, Andreas; Menn, Ingolf; Aschemann, Harald: Robust Control with State and Disturbance Estimation for Distributed Parameter Systems, Proc. of 15th Intl. Workshop on Dynamics and Control 2009, pp. 135-142, Tossa de Mar, Spain, 2009. [3] Rauh, Andreas; Auer, Ekaterina; Aschemann, Harald: Real-Time Application of Interval Methods for Robust Control of Dynamical Systems, CD-Proc. of IEEE Intl. Conference on Methods and Models in Automation and Robotics MMAR 2009, Miedzyzdroje, Poland, 2009. [4] Auer, Ekaterina; Luther, Wolfram: Numerical Verification Assessment in Computational Biomechanics, in A. Cuyt, W. Krämer, W. Luther, P. Markstein: Numerical Validation in Current Hardware Architectures, LNCS 5492, pp. 145-160, Springer-Verlag, Berlin, Heidelberg, 2009.

Cite as

Andreas Rauh and Ekaterina Auer. Interval Approaches to Reliable Control of Dynamical Systems. In Computer-assisted proofs - tools, methods and applications. Dagstuhl Seminar Proceedings, Volume 9471, pp. 1-28, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)


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@InProceedings{rauh_et_al:DagSemProc.09471.3,
  author =	{Rauh, Andreas and Auer, Ekaterina},
  title =	{{Interval Approaches to Reliable Control of Dynamical Systems}},
  booktitle =	{Computer-assisted proofs - tools, methods and applications},
  pages =	{1--28},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{9471},
  editor =	{B. Malcolm Brown and Erich Kaltofen and Shin'ichi Oishi and Siegfried M. Rump},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.09471.3},
  URN =		{urn:nbn:de:0030-drops-25120},
  doi =		{10.4230/DagSemProc.09471.3},
  annote =	{Keywords: Robust control, Ordinary differential equations, Differential-algebraic equations}
}
Document
Verification and Validation for Femur Prosthesis Surgery

Authors: Ekaterina Auer, Roger Cuypers, Eva Dyllong, Stefan Kiel, and Wolfram Luther

Published in: Dagstuhl Seminar Proceedings, Volume 9471, Computer-assisted proofs - tools, methods and applications (2010)


Abstract
In this paper, we describe how verified methods we are developing in the course of the project TellHim&S (Interval Based Methods For Adaptive Hierarchical Models In Modeling And Simulation Systems) can be applied in the context of the biomechanical project PROREOP (Development of a new prognosis system to optimize patient-specific pre- operative surgical planning for the human skeletal system). On the one hand, it includes the use of verified hierarchical structures for reliable geometric modeling, object decomposition, distance computation and path planning. On the other hand, we cover such tasks as verification and validation assessment and propagation of differently described uncertainties through system models in engineering or mechanics.

Cite as

Ekaterina Auer, Roger Cuypers, Eva Dyllong, Stefan Kiel, and Wolfram Luther. Verification and Validation for Femur Prosthesis Surgery. In Computer-assisted proofs - tools, methods and applications. Dagstuhl Seminar Proceedings, Volume 9471, pp. 1-22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)


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@InProceedings{auer_et_al:DagSemProc.09471.4,
  author =	{Auer, Ekaterina and Cuypers, Roger and Dyllong, Eva and Kiel, Stefan and Luther, Wolfram},
  title =	{{Verification and Validation for Femur Prosthesis Surgery}},
  booktitle =	{Computer-assisted proofs - tools, methods and applications},
  pages =	{1--22},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{9471},
  editor =	{B. Malcolm Brown and Erich Kaltofen and Shin'ichi Oishi and Siegfried M. Rump},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.09471.4},
  URN =		{urn:nbn:de:0030-drops-25133},
  doi =		{10.4230/DagSemProc.09471.4},
  annote =	{Keywords: Graphical interface construction, superquadrics, 3D modeling, biomedical engineering}
}
Document
05391 Abstracts Collection – Algebraic and Numerical Algorithms and Computer-assisted Proofs

Authors: Bruno Buchberger, Shin'ichi Oishi, Michael Plum, and Siegfried M. Rump

Published in: Dagstuhl Seminar Proceedings, Volume 5391, Algebraic and Numerical Algorithms and Computer-assisted Proofs (2006)


Abstract
From 25.09.05 to 30.09.05, the Dagstuhl Seminar 05391 ``Algebraic and Numerical Algorithms and Computer-assisted Proofs'' was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. Links to extended abstracts or full papers are provided, if available.

Cite as

Bruno Buchberger, Shin'ichi Oishi, Michael Plum, and Siegfried M. Rump. 05391 Abstracts Collection – Algebraic and Numerical Algorithms and Computer-assisted Proofs. In Algebraic and Numerical Algorithms and Computer-assisted Proofs. Dagstuhl Seminar Proceedings, Volume 5391, pp. 1-15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)


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@InProceedings{buchberger_et_al:DagSemProc.05391.1,
  author =	{Buchberger, Bruno and Oishi, Shin'ichi and Plum, Michael and Rump, Siegfried M.},
  title =	{{05391 Abstracts Collection – Algebraic and Numerical Algorithms and Computer-assisted Proofs}},
  booktitle =	{Algebraic and Numerical Algorithms and Computer-assisted Proofs},
  pages =	{1--15},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5391},
  editor =	{Bruno Buchberger and Shin'ichi Oishi and Michael Plum and Sigfried M. Rump},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.05391.1},
  URN =		{urn:nbn:de:0030-drops-4555},
  doi =		{10.4230/DagSemProc.05391.1},
  annote =	{Keywords: Self-validating methods, computer algebra, computer-assisted proofs, real number algorithms}
}
Document
05391 Executive Summary – Numerical and Algebraic Algorithms and Computer-assisted Proofs

Authors: Bruno Buchberger, Christian Jansson, Shin'ichi Oishi, Michael Plum, and Siegfried M. Rump

Published in: Dagstuhl Seminar Proceedings, Volume 5391, Algebraic and Numerical Algorithms and Computer-assisted Proofs (2006)


Abstract
The common goal of self-validating methods and computer algebra methods is to solve mathematical problems with complete rigor and with the aid of computers. The seminar focused on several aspects of such methods for computer-assisted proofs.

Cite as

Bruno Buchberger, Christian Jansson, Shin'ichi Oishi, Michael Plum, and Siegfried M. Rump. 05391 Executive Summary – Numerical and Algebraic Algorithms and Computer-assisted Proofs. In Algebraic and Numerical Algorithms and Computer-assisted Proofs. Dagstuhl Seminar Proceedings, Volume 5391, pp. 1-5, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)


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@InProceedings{buchberger_et_al:DagSemProc.05391.2,
  author =	{Buchberger, Bruno and Jansson, Christian and Oishi, Shin'ichi and Plum, Michael and Rump, Siegfried M.},
  title =	{{05391 Executive Summary – Numerical and Algebraic Algorithms and Computer-assisted Proofs}},
  booktitle =	{Algebraic and Numerical Algorithms and Computer-assisted Proofs},
  pages =	{1--5},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5391},
  editor =	{Bruno Buchberger and Shin'ichi Oishi and Michael Plum and Sigfried M. Rump},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemProc.05391.2},
  URN =		{urn:nbn:de:0030-drops-4549},
  doi =		{10.4230/DagSemProc.05391.2},
  annote =	{Keywords: Self-validating methods, computer algebra, computer-assisted proofs, real number algorithms}
}
Document
Theoretical and Computational Aspects of Matrix Algorithms (Dagstuhl Seminar 03421)

Authors: Nick Higham, Volker Mehrmann, Siegfried M. Rump, and Daniel B. Szyld

Published in: Dagstuhl Seminar Reports. Dagstuhl Seminar Reports, Volume 1 (2021)


Abstract

Cite as

Nick Higham, Volker Mehrmann, Siegfried M. Rump, and Daniel B. Szyld. Theoretical and Computational Aspects of Matrix Algorithms (Dagstuhl Seminar 03421). Dagstuhl Seminar Report 398, pp. 1-5, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2003)


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@TechReport{higham_et_al:DagSemRep.398,
  author =	{Higham, Nick and Mehrmann, Volker and Rump, Siegfried M. and Szyld, Daniel B.},
  title =	{{Theoretical and Computational Aspects of Matrix Algorithms (Dagstuhl Seminar 03421)}},
  pages =	{1--5},
  ISSN =	{1619-0203},
  year =	{2003},
  type = 	{Dagstuhl Seminar Report},
  number =	{398},
  institution =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemRep.398},
  URN =		{urn:nbn:de:0030-drops-152786},
  doi =		{10.4230/DagSemRep.398},
}
Document
Symbolic-algebraic Methods and Verification Methods - Theory and Applications (Dagstuhl Seminar 99471)

Authors: Götz Alefeld, Jiri Rohn, Siegfried M. Rump, and Tesuro Yamamoto

Published in: Dagstuhl Seminar Reports. Dagstuhl Seminar Reports, Volume 1 (2021)


Abstract

Cite as

Götz Alefeld, Jiri Rohn, Siegfried M. Rump, and Tesuro Yamamoto. Symbolic-algebraic Methods and Verification Methods - Theory and Applications (Dagstuhl Seminar 99471). Dagstuhl Seminar Report 260, pp. 1-34, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2000)


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@TechReport{alefeld_et_al:DagSemRep.260,
  author =	{Alefeld, G\"{o}tz and Rohn, Jiri and Rump, Siegfried M. and Yamamoto, Tesuro},
  title =	{{Symbolic-algebraic Methods and Verification Methods - Theory and Applications (Dagstuhl Seminar 99471)}},
  pages =	{1--34},
  ISSN =	{1619-0203},
  year =	{2000},
  type = 	{Dagstuhl Seminar Report},
  number =	{260},
  institution =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemRep.260},
  URN =		{urn:nbn:de:0030-drops-151457},
  doi =		{10.4230/DagSemRep.260},
}
Document
Symbolic, Algebraic and Validated Numerical Computation (Dagstuhl Seminar 9232)

Authors: James H. Davenport, Fritz Krückeberg, Ramon E. More, and Siegfried M. Rump

Published in: Dagstuhl Seminar Reports. Dagstuhl Seminar Reports, Volume 1 (2021)


Abstract

Cite as

James H. Davenport, Fritz Krückeberg, Ramon E. More, and Siegfried M. Rump. Symbolic, Algebraic and Validated Numerical Computation (Dagstuhl Seminar 9232). Dagstuhl Seminar Report 43, pp. 1-20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (1992)


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@TechReport{davenport_et_al:DagSemRep.43,
  author =	{Davenport, James H. and Kr\"{u}ckeberg, Fritz and More, Ramon E. and Rump, Siegfried M.},
  title =	{{Symbolic, Algebraic and Validated Numerical Computation (Dagstuhl Seminar 9232)}},
  pages =	{1--20},
  ISSN =	{1619-0203},
  year =	{1992},
  type = 	{Dagstuhl Seminar Report},
  number =	{43},
  institution =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DagSemRep.43},
  URN =		{urn:nbn:de:0030-drops-149318},
  doi =		{10.4230/DagSemRep.43},
}
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