Andreas Tietze (1914-2003)

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چکیده

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منابع مشابه

A Tietze Transformation Program

A Reidemeister-Schreier program which yields a presentation of a subgroup H of finite index in a finitely presented group G is described in [3J. The program has two stages; first, Schreier generators and Reidemeister relators for H are computed, then the resulting presentation is simplified by eliminating redundant generators and by using a substring searching technique. The Tietze transformati...

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Discussion Andreas

Gelman’s article is a thought-provoking mix of opinions and creative methodology. I agree with Gelman that the disjunction of models and exploratory data analysis (EDA) in mainstream statistics is unsound. The assumption that models belong exclusively to confirmatory data analysis (CDA) is easily shown to be wrong in practice. Many uses of models, in particular model selection, are exploratory,...

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Andreas Kemmerling

Assuming that there are correct basic norms, is there a way to explain their correctness? Paul does not think so, and he argues that a certain family of strategies for explaining the correctness of one particular class of basic epistemic norms does not work. The norms in question are those which concern the acceptance of ID-sentences, i.e. sentences which are, or seem to be, the implicit defini...

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Andreas Größler

The purpose of this paper is to provide a heuristic that can help to decide whether qualitative or quantitative system dynamics modeling is useful in organizational modeling projects. The heuristic depends on the initial problem formulation, in form of a question to be answered. The argumentation is based on conceptual musings and on two short case studies to exemplify the usage of the heuristi...

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Presentations and Tietze transformations of C*-algebras

In this work, I develop a new view of presentation theory for C*-algebras, both unital and nonunital, heavily grounded in classical notions from algebra. In particular, I introduce Tietze transformations for these presentations, which lead to a transformation theorem analogous to Tietze’s 1908 result in group theory.

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ژورنال

عنوان ژورنال: Middle East Studies Association Bulletin

سال: 2004

ISSN: 0026-3184,2329-3233

DOI: 10.1017/s0026318400046885