Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 130 for “"fixed points"”.
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Fixed Points and Coincidences
… 3 we provide theorems extending the well-known fixed point theorems for multivalued maps on topological vector spaces, as well as some selection theorems.
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Centres, fixed points and invariant integration
vi, 99 leaves : ill. ; 26 cm.
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Symplectic circle actions with isolated fixed points
… symplectic manifold $M$ with non-empty isolated fixed points. Associated to each fixed point, there are well-defined non-zero integers, called \emph{weights}. We prove that the action is Hamiltonian if the sum of an odd number of weights is never equal to the sum of an even number of weights (the …
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Robustness of Fixed Points of Quantum Processes
… the general area of the theory of robustness of fixed points (or invariant states) of quantum processes. In the first part of the thesis, we address the following question: Given a quantum channel and a quantum state which is almost a fixed point of the channel, can we find a new channel and a …
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Fixed points for nonexpansive mappings in Banach spaces
Bibliography: pages 140-142.
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Applications of metrics over Tikonov semifields and fixed points in Hilbert spaces
… sufficient conditions are given for the set of fixed points to be a Non expansive retract. Also, sufficient conditions are given for certain semigroups of asymptotically Non expansive mappings to have a common fixed point.</p> <p>Several results concerning convergence of the sequence of iterates …
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Some Mapping Theorems With Applications to Fixed Points of Multiple-Valued Transformations
Made available in DSpace on 2014-12-05T21:50:25Z (GMT). No. of bitstreams: 1 6402940.pdf: 1265227 bytes, checksum: 5edb71167fb556e39fa81a290549139e (MD5) Previous issue date: 1963
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Maps of intervals with indifferent fixed points: thermodynamic formalism and phase transitions
… class of maps of the interval with indifferent fixed points. For such systems the formalism yields one-dimensional systems with many-body infinite range interactions for which the thermodynamics is well defined while the Gibbs states are not. (Piecewise linear systems of this kind yield the …
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Monochromator-based absolute calibration of radiation thermometers for thermodynamic temperature measurements of high-temperature fixed-points
Die Messunsicherheit bei der Realisierung der Internationalen Temperaturskala (ITS-90)nimmt oberhalb der Kupfererstarrungstemperatur von 1084,62 °C stetig zu, da die Skala hier über eine Extrapolation basierend auf dem Planckschen Strahlungsgesetz und ausgehend von den Temperaturen des erstarrenden …
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Results on the fixed points of multifunctions with applications to problems in optimization and equilibrium theory
… in optimization and equilibrium theory. First, fixed point index theory for multifunctions is used to extend a continuation result of F. E. Browder. This extension is then used to obtain existence results for several types of variational inequality problems. In particular, extensions of Eaves' …
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Dynamics of three-degree-of-freedom systems with quadratic nonlinearities
… and phases of the first system. Then the fixed points of these equations are obtained and their stability is determined. The fixed points undergo Hopf bifurcations, and the overall system response can be periodic or periodically, quasiperiodically, or chaotically modulated. The method of …
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Dynamical systems on networks
… networks. Our main focus is on understanding the fixed points of these systems and their stability. For many models the stability of such fixed points can be studied with a Laplacian matrix. We give a formula for the inertia of these matrices, characterizing the real parts of the spectrum, by …
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Phase transitions and symmetry breaking in disordered quantum Hall edge states
… directions along the edge have multiple stable fixed points which can be classified by their symmetries. When the tunneling current into an edge is large, the system can cross over from the weak-tunneling fixed point to a different strongly coupled fixed point with different conductance and …
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Statistics on pattern-avoiding permutations
… of the pair of statistics 'number of fixed points' and 'number of excedances' is the same in 321-avoiding as in 132-avoiding permutations. This generalizes a recent result of Robertson, Saracino and Zeilberger, for which we also give another, more direct proof. The key ideas are to …
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Finding and exploiting structure in complex systems via geometric and statistical methods
… revealed by the study of invariant manifolds of fixed points and periodic orbits in the first system, there do not exist any fixed points (and hence invariant manifolds) in the second system. The use of statistical (or measure theoretic) and topological methods reveals the phase space structure …
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Digital Curvature Estimation: An Operator Theoretic Approach
… on the range of the operator annihilates the fixed points of the operator. To this end, we will prove by spectral properties that the iterates of every positive finite-rank operator converge uniformly. As highlight of this thesis, we show a constructive way using a Gramian matrix where the …
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GMD Decoding of Euclidean -Space Codes and Iterative Decoding of Turbo Codes
… is associated with the bifurcation of certain fixed points. This connection explains the dramatic improvement of performance in the waterfall region, and leads to a better understanding of the turbo decoding algorithm. Specifically, a simplified stopping criterion based on the characteristics …
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Monomial Dynamical Systems over Finite Fields
… for a monomial dynamical system to have only fixed points as limit cycles.
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Implicit Fixed-point Proximity Framework for Optimization Problems and Its Applications
… challenging and numerically difficult. The fixed-point proximity framework that we will systematically study in this dissertation provides a direct and unified methodology for finding solutions to those optimization problems. The framework approaches the models arising from applications …
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