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    <namePart>Schürmann, Achill</namePart>
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  <abstract type="Summary">We provide an overview of formal duality with an emphasis on the authors contributions. Every formally dual set can be obtained from a primitive formally dual set or, more generally from an irreducible formally dual set.Using several methods, including even set theory and the field-descent method, it is possible to obtain examples of primitive/irreducible formally dual sets as well as non-existence results. A graph search algorithm can be used for further investigation. Overall, primitive formally dual sets seem rare in cyclic groups, but occasionally exist in finite abelian groups.&lt;eng&gt;</abstract>
  <abstract type="Summary">In dieser Dissertation geben wir einen Überblick über formale Dualität. Jede formal duale Menge kann von einer primitiven, oder allgemeiner von einer irreduziblen, formal dualen Menge, konstruiert werden. Methoden wie die 'even set' Theorie oder die 'field-descent' Methode, können genutzt werden, um Beispiele für primitive/irreduzible formal duale Mengen sowie nicht-Existenz Resultate zu erhalten. Weiterhin kann ein Suchalgorithmus genutzt werden. Primitive formal duale Mengen scheinen in zyklischen Gruppen selten zu sein, kommen aber gelegentlich in endlichen abelschen Gruppen vor.&lt;ger&gt;</abstract>
  <note type="statement of responsibility">vorgelegt von Robert Schüler</note>
  <note>The author is supported by DFG grant SCHU 1503/7</note>
  <note>GutachterInnen: Achill Schürmann (Universität Rostock, Institut für Mathematik) ; Alexander Pott (Otto-von-Guericke-Universität Magdeburg, Institut für Algebra und Geometrie)</note>
  <note type="thesis">Dissertation Universität Rostock 2019</note>
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