Automorphisms and cohomology of switching classes
β Scribed by Peter J Cameron
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 117 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0095-8956
No coin nor oath required. For personal study only.
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In view of its importance for the study of idempotents in group rings, a certain class C of groups, deΓΏned by means of a cohomological condition, was introduced by Emmanouil (Invent. Math. 132 (1998) 307-330). In the present paper, we establish the limitation of that class by constructing explicit e
We will prove that certain torsion classes in the cohomology of SL(2, O) give Galois representations for the relevant number field.
For a finite undirected graph G = (V, E) and a subset A β V , the vertex switching of G by A is defined as the graph G A = (V, E ), which is obtained from G by removing all edges between A and its complement A and adding as edges all nonedges between A and A. The switching class [G] determined by G