Skip to main content
7 of 7
edited tags
Ali Taghavi
  • 356
  • 8
  • 31
  • 123

Some counter examples in group theory

In this question, which we flag it as a community wiki question, we search for a big list of groups $G$ which can not be isomorphic to a structure mentioned in $i.$ for some $i \in \{1,2,\ldots,6 \}$

  1. The homeomorphism group of a topological space $X$.
  2. The automorphism group of a (not necessarily finite dimensional) Lie algebra.
  3. The automorphism group of a coalgebra.
  4. (Assuming $G$ is a Lie group) The isometry group of a Riemannian manifold.
  5. The automorphism group of another group.
  6. The automorphism group of a ring.
Ali Taghavi
  • 356
  • 8
  • 31
  • 123