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- Friedrich-Alexander-Universität Erlangen-NürnbergDE49 papers
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6 papers · 1 filter
Submodule Categories of Wild Representation Type
Claus Michael Ringel, Markus Schmidmeier
Let be a commutative local uniserial ring of length at least seven with radical factor ring . We consider the category of all possible embeddings of submodules of fin…
Bounded Submodules of Modules
Markus Schmidmeier
Let , be positive integers such that . We consider all pairs where is a finite dimensional -bounded -module and is a submodule of whi…
A Construction of Metabelian Groups
Markus Schmidmeier
In 1934, Garrett Birkhoff has shown that the number of isomorphism classes of finite metabelian groups of order tends to infinity with . More precisely, for each prime…
Towards wave extraction in numerical relativity: the quasi-Kinnersley frame
Andrea Nerozzi, Christopher Beetle, Marco Bruni +2
The Newman-Penrose formalism may be used in numerical relativity to extract coordinate-invariant information about gravitational radiation emitted in strong-field dynamical scenari…
Towards a novel wave-extraction method for numerical relativity. I. Foundations and initial-value formulation
Christopher Beetle, Marco Bruni, Lior M. Burko +1
The Teukolsky formalism of black hole perturbation theory describes weak gravitational radiation generated by a mildly dynamical hole near equilibrium. A particular null tetrad of…
Analyzing Multiple Nonlinear Time Series with Extended Granger Causality
Yonghong Chen, Govindan Rangarajan, Jianfeng Feng +1
Identifying causal relations among simultaneously acquired signals is an important problem in multivariate time series analysis. For linear stochastic systems Granger proposed a si…