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Topics: Radio Program, Population ecology, Medical specialties, Demography, Epidemiology, Mass media,...

Thesis--Illinois

Topics: Automatic theorem proving, First-order logic

Topics: Radio Program, Political terminology, Elections, American jazz singers, Sweeteners, Writers from...

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viii, 281 p. : 24 cm

Topics: Artificial intelligence -- Congresses, Computer vision -- Congresses, Robotics -- Congresses,...

17
17

May 21, 2012
05/12

by
Walther, Christoph

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Revised translation of thesis (doctoral)--University of Karlsruhe, 1984

Topics: Automatic theorem proving, Artificial intelligence, Intelligence artificielle, Théorèmes,...

Topics: Radio Program, Australian novelists, LGBT culture, Writing, LGBT terms, Fiction, Law enforcement,...

167
167

May 31, 2011
05/11

by
VanHeukelem, Laurie; Thomas, Crystal S.; Gilbert, Patricia M

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The purpose of this technical report is to provide current documentation of the Sensor Intercomparison and Merger for Biological and Interdisciplinary Oceanic Studies (SIMBIOS) Project activities, NASA Research Announcement (NRA) research status, satellite data processing, data product validation, and field calibration. This documentation is necessary to ensure that critical information is related to the scientific community and NASA management. This critical information includes the technical...

Topics: SINGULARITY (MATHEMATICS), OPTIMIZATION, MATHEMATICAL MODELS, SET THEORY, PROBLEM SOLVING, THEOREM...

98
98

May 31, 2011
05/11

by
Barth, Jane

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LWS (Living With a Star) is research science focused to facilitate enabling science for spacecraft design (specifically environment specification models) and spacecraft operations (specifically Space Weather research). The following topics are discussed: LWS goals and program, program architecture, the solar dynamic observer, the geospace plan, the space environment testbed concept, and the heliosphere missions.

Topics: SOFTWARE ENGINEERING, DISASTERS, COMPUTER PROGRAMS, THEOREM PROVING, TELECOMMUNICATION, RISK,...

A concurrent system consists of processes and shared objects. Previous research focused on the problem of tolerating process failure. We study the complementary problem of tolerating failures. We divide object failures into two broad classes: responsive and non-responsive. With responsive failures, a faulty object responds to every invocation, but responses may be incorrect. With non-responsive failures, a faulty object may also 'hang' without responding. For each class, we consider crash, and...

Topics: NASA Technical Reports Server (NTRS), ARCHITECTURE (COMPUTERS), COMMUNICATION NETWORKS, COMPUTER...

A tutorial on the development of a formal specification and its verification using the Prototype Verification System (PVS) is presented. The tutorial presents the formal specification and verification techniques by way of specific example - an airline reservation system. The airline reservation system is modeled as a simple state machine with two basic operations. These operations are shown to preserve a state invariant using the theorem proving capabilities of PVS. The technique of validating...

Topics: NASA Technical Reports Server (NTRS), AIRLINE OPERATIONS, PROGRAM VERIFICATION (COMPUTERS), THEOREM...

Automatic formal verification methods for finite-state systems, also known as model-checking, successfully reduce labor costs since they are mostly automatic. Model checkers explicitly or implicitly enumerate the reachable state space of a system, whose behavior is described implicitly, perhaps by a program or a collection of finite automata. Simple properties, such as mutual exclusion or absence of deadlock, can be checked by inspecting individual states. More complex properties, such as lack...

Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, AUTOMATA THEORY, PROGRAM VERIFICATION...

A safety claim for a system is a statement that the system, which is subject to hazardous conditions, satisfies a given set of properties. Following work by John Rushby and Bev Littlewood, this paper presents a mathematical framework that can be used to state and formally prove probabilistic safety claims. It also enables hazardous conditions, their uncertainties, and their interactions to be integrated into the safety claim. This framework provides a formal description of the probabilistic...

Topics: NASA Technical Reports Server (NTRS), PROBABILITY THEORY, FORMALISM, MATHEMATICAL MODELS, SAFETY,...

Topics: Radio Program, Republics, G20 nations, International trade, American political pundits, Member...

This volume was digitized and made accessible online due to deterioration of the original print copy.

Topics: Automatic theorem proving, Logic, Symbolic and mathematical, Predicate calculus--Data processing,...

Topics: Radio Program, May observances, Diseases of the eye and adnexa, American culture, Jewish American...

Topics: Radio Program, Prosecution, American businesspeople, American legal scholars, Legal professions,...

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Topics: Radio Program, Law, Spiders, Personhood, Pharmacology, Fibers, Polyamides, Colorado River, Colorado...

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Topics: Radio Program, Bullying, American Roman Catholics, California Democrats, Public utilities, American...

A class of multivariable, nonlinear time-varying feedback systems with an unstable convolution subsystem as feedforward and a time-varying nonlinear gain as feedback was considered. The impulse response of the convolution subsystem is the sum of a finite number of increasing exponentials multiplied by nonnegative powers of the time t, a term that is absolutely integrable and an infinite series of delayed impulses. The main result is a theorem. It essentially states that if the unstable...

Topics: NASA Technical Reports Server (NTRS), FEEDFORWARD CONTROL, NONLINEAR EQUATIONS, NONLINEAR FEEDBACK,...

Topics: Radio Program, Public high schools in Ohio, Basketball terminology, Road infrastructure, Rules of...

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Topics: Radio Program, Criminal law, Mayors, Borders, Security, Automated theorem proving, National...

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7.0

Jul 27, 2019
07/19

by
Chou, Shang-Ching, 1942-

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xii, 362 p. : 25 cm

Topic: Automatic theorem proving

Quasilinear Dirichlet and Neumann problems on a rectangle D with boundary D prime are considered. Using these concepts, conjugate problems, that is, a pair of one Dirichlet and one Neumann problem, the minima of the energies of which add to zero, are introduced. From the concept of conjugate problems, two-sided bounds for the energy of the exact solution of any given Dirichlet or Neumann problem are constructed. These two-sided bounds for the energy at the exact solution are in turn used to...

Topics: NASA Technical Reports Server (NTRS), DIRICHLET PROBLEM, ERRORS, NEUMANN PROBLEM, NONLINEAR...

The robustness of control systems with respect to model uncertainty is considered using simple frequency domain criteria. Results are derived under a common framework in which the minimum singular value of the return difference transfer matrix is the key quantity. In particular, the LQ and LQG robustness results are discussed.

Topics: NASA Technical Reports Server (NTRS), CONTROL STABILITY, CONTROL THEORY, FEEDBACK CONTROL, LINEAR...

The nonlinear parabolic equation describing the propagation of the electromagnetic wave in a semiconductor with the superlattice is analyzed. The possibility of the existence of the solitary waves is proved both for a small amplitude of the electrical field and the latter moderate values.

Topics: NASA Technical Reports Server (NTRS), NONLINEAR EQUATIONS, SEMICONDUCTORS (MATERIALS), SOLITARY...

We motivate and introduce a query language PrQL designed for inspecting machine representations of proofs. PrQL natively supports hiproofs which express proof structure using hierarchical nested labelled trees. The core language presented in this paper is locally structured (first-order), with queries built using recursion and patterns over proof structure and rule names. We define the syntax and semantics of locally structured queries, demonstrate their power, and sketch some implementation...

Topics: NASA Technical Reports Server (NTRS), THEOREM PROVING, QUERY LANGUAGES, AUTOMATIC CONTROL, LOGIC...

In this paper we study the difficulty of solving problems in economics. For this purpose, we adopt the notion of undecidability from recursion theory. We show that certain problems in economics are undecidable, i.e., cannot be solved by a Turing Machine, a device that is at least as powerful as any computational device that can be constructed. In particular, we prove that even in finite closed economies subject to a variable initial condition, in which a social planner knows the behavior of...

Topics: NASA Technical Reports Server (NTRS), ECONOMIC ANALYSIS, ECONOMICS, ECONOMY, POLICIES, THEOREM...

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viii, 281 p. : 24 cm

Topics: Artificial intelligence -- Congresses, Computer vision -- Congresses, Robotics -- Congresses,...

212
212

Jul 5, 2010
07/10

by
Frolov, U

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No Abstract Available

Topics: LINEAR SYSTEMS, PERIODIC FUNCTIONS, DIFFERENTIAL EQUATIONS, MATRICES (MATHEMATICS), THEOREM PROVING

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319

Jun 19, 2010
06/10

by
Arnold, V. N

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Small denominators, and representation of circle - theorem proving

Topics: ANALYTIC FUNCTIONS, CIRCLES (GEOMETRY), DIRICHLET PROBLEM, THEOREM PROVING, ANALYTIC FUNCTION,...

This annual report summarizes the research activities that were performed from 26 Jun. 1993 to 28 Feb. 1994. We continued to investigate the Robust Stability of Systems where transfer functions or characteristic polynomials are affine multilinear functions of parameters. An approach that differs from 'Stability by Linear Process' and that reduces the computational burden of checking the robust stability of the system with multilinear uncertainty was found for low order, 2-order, and 3-order...

Topics: NASA Technical Reports Server (NTRS), CONTROLLERS, H-INFINITY CONTROL, NUMERICAL STABILITY, THEOREM...

The purpose of this report is to provide correctness and reliability criteria for verification and validation (V&V) of Second Generation Reusable Launch Vehicle (RLV) Diagnostic Modeling Environment, describe current NASA Ames Research Center tools for V&V of Model Based Reasoning systems, and discuss the applicability of Advanced V&V to DME. This report is divided into the following three sections: (1) correctness and reliability criteria; (2) tools for V&V of Model Based...

Topics: NASA Technical Reports Server (NTRS), RELIABILITY ANALYSIS, REUSABLE LAUNCH VEHICLES, SOFTWARE...

We describe an approach to strategy-based proving for improved interactive deduction in specialized domains. An experimental package of strategies (tactics) and support functions called Manip has been developed for PVS to reduce the tedium of arithmetic manipulation. Included are strategies aimed at algebraic simplification of real-valued expressions. A general deduction architecture is described in which domain-specific strategies, such as those for algebraic manipulation, are supported by...

Topics: NASA Technical Reports Server (NTRS), ARITHMETIC, SIMPLIFICATION, THEOREM PROVING, APPROXIMATION,...

This paper proposes a challenge problem in disproving. We describe a fault-tolerant distributed protocol designed at NASA for use in a fly-by-wire system for next-generation commercial aircraft. An early design of the protocol contains a subtle bug that is highly unlikely to be caught in fault injection testing. We describe a failed proof of the protocol's correctness in a mechanical theorem prover (PVS) with a complex unfinished proof conjecture. We use a model checking suite (SAL) to generate...

Topics: NASA Technical Reports Server (NTRS), COMMERCIAL AIRCRAFT, FAULT TOLERANCE, FLY BY WIRE CONTROL,...

Proofs provide detailed justification for the validity of claims and are widely used in formal software development methods. However, they are often complex and difficult to understand, because they use machine-oriented formalisms; they may also be based on assumptions that are not justified. This causes concerns about the trustworthiness of using formal proofs as arguments in safety-critical applications. Here, we present an approach to develop safety cases that correspond to formal proofs...

Topics: NASA Technical Reports Server (NTRS), FORMALISM, SAFETY, COMPUTER SYSTEMS PROGRAMS, THEOREM...

Sturm's Theorem is a well-known result in real algebraic geometry that provides a function that computes the number of roots of a univariate polynomial in a semiopen interval. This paper presents a formalization of this theorem in the PVS theorem prover, as well as a decision procedure that checks whether a polynomial is always positive, nonnegative, nonzero, negative, or nonpositive on any input interval. The soundness and completeness of the decision procedure is proven in PVS. The procedure...

Topics: NASA Technical Reports Server (NTRS), POLYNOMIALS, INEQUALITIES, THEOREM PROVING, ROOTS OF...

Folkscanomy: A Library of Books

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291

Dec 30, 2015
12/15

by
International Workshop on Automated Deduction in Geometry (3rd : 2000 : Zurich, Switzerland); Richter-Gebert, Jürgen, 1963-; Wang, Dongming

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Automated Deduction in Geometry: Third InternationalWorkshop, ADG 2000 Zurich, Switzerland, September 25–27, 2000 Revised Papers Author: Jürgen Richter-Gebert, Dongming Wang Published by Springer Berlin Heidelberg ISBN: 978-3-540-42598-4 DOI: 10.1007/3-540-45410-1 Table of Contents: On Spatial Constraint Solving Approaches A Hybrid Method for Solving Geometric Constraint Problems Solving the Birkhoff Interpolation Problem via the Critical Point Method: An Experimental Study A Practical...

Topics: Geometry, Automatic theorem proving, Logic, Symbolic and mathematical

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1.0

Jul 3, 2020
07/20

by
International Workshop on Automated Deduction in Geometry (5th : 2004 : Gainesville, Fla.)

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x, 211 p. : 24 cm

Topics: Geometry -- Data processing -- Congresses, Automatic theorem proving -- Congresses, Logic, Symbolic...

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232

Jun 26, 2010
06/10

by
Ingham, J. D

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Physiological effects of cyanate ions in renal malfunctions

Topics: DYNAMIC STABILITY, THEOREM PROVING, TOPOLOGY, DYNAMIC STRUCTURAL ANALYSIS, FUNCTIONS (MATHEMATICS),...

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Oct 7, 2020
10/20

by
Conference on Automated Deduction (6th : 1982 : New York, N.Y.)

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vii, 389 pages ; 25 cm

Topics: Automatic theorem proving -- Congresses, Logic, Symbolic and mathematical -- Congresses, Automatic...

12
12

Aug 8, 2019
08/19

by
Chou, Shang-Ching, 1946-

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xvii, 461 p. : 23 cm

Topics: Automatic theorem proving, Axioms -- Data processing

The REBOUND adaptation framework organizes a collection of adaptation tactics in a way that they can be selected based on the components available for adaptation. Adaptation tactics are specified formally in terms of the relationship between the component to be adapted and the resulting adapted component. The tactic specifications are used as matching conditions for specification-based component retrieval, creating a 'retrieval for adaptation' scenario. The results of specification matching are...

Topics: NASA Technical Reports Server (NTRS), SOFTWARE REUSE, COMPUTER PROGRAMMING, ARCHITECTURE...

This paper presents a partial solution to the long standing open problem of termination of one-rule string rewriting. Overlaps between the two sides of the rule play a central role in existing termination criteria. We characterize termination of all one-rule string rewriting systems that have one such overlap at either end. This both completes a result of Kurth and generalizes a result of Shikishima-Tsuji et al.

Topics: NASA Technical Reports Server (NTRS), SINGULARITY (MATHEMATICS), OPTIMIZATION, MATHEMATICAL MODELS,...

Explicit substitution calculi are extensions of the Lambda-calculus where the substitution mechanism is internalized into the theory. This feature makes them suitable for implementation and theoretical study of logic-based tools such as strongly typed programming languages and proof assistant systems. In this paper we explore new developments on two of the most successful styles of explicit substitution calculi: the lambda(sigma)- and lambda(s(e))-calculi.

Topics: NASA Technical Reports Server (NTRS), CALCULUS, SUBSTITUTES, COMPUTATION, DIFFERENTIAL EQUATIONS,...

Topics: Radio Program, National Association of Independent Colleges and Universities members, Sociological...

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220

Jul 25, 2010
07/10

by
Griest, Kim; Sadoulet, Bernar

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The connection between the annihilation, elastic, and production cross sections is reviewed, showing how a general lower limit on the interaction rate in a detector is obtained from the requirement that a particle be the dark matter. High energy production experiments further constrain models, making very light dark matter particles unlikely. Special attention is paid to the uncertainties, loopholes and model dependencies that go into the arguments and several examples are given.

Topics: ARTIFICIAL INTELLIGENCE, COMPUTER SYSTEMS PERFORMANCE, EXPERT SYSTEMS, LOGIC PROGRAMMING, THEOREM...

Topics: Radio Program, December observances, NPR member networks, Regions of Oregon, Romantic composers,...

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254

Jun 21, 2010
06/10

by
Mayo, J. W.; Michael, J. E

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Distribution of currents to circuits using electrical adaptor

Topics: APPROXIMATION, ITERATIVE SOLUTION, NONLINEAR EQUATIONS, ALGORITHMS, BANACH SPACE, BOUNDARY VALUE...

In order to provide a theoretical tool suited for characterizing the stability margins of multiloop feedback systems, multiloop input-output stability results generalizing the circle stability criterion are considered. Generalized conic sectors with 'centers' and 'radii' determined by linear dynamical operators are employed to specify the stability margins as a frequency dependent convex set of modeling errors (including nonlinearities, gain variations and phase variations) which the system...

Topics: NASA Technical Reports Server (NTRS), CASCADE CONTROL, CONTROL STABILITY, CONTROL THEORY, CONICS,...

A phase-by-phase modelling technique is introduced to evaluate a fault tolerant system's ability to execute different sets of computational tasks during different phases of the control process. Intraphase processes are allowed to differ from phase to phase. The probabilities of interphase state transitions are specified by interphase transition matrices. Based on constraints imposed on the intraphase and interphase transition probabilities, various iterative solution methods are developed for...

Topics: NASA Technical Reports Server (NTRS), COMPUTER SYSTEMS PROGRAMS, RELIABILITY ANALYSIS, SYSTEMS...