Three amalgams with remarkable normal subgroup structures

Details Three amalgams with remarkable normal subgroup structures Three amalgams with remarkable normal subgroup structures

2005-06-15

arxiv.org/abs/math/0506306v1

Mathematics

Group Theory

6 pages

Scientific paper

We construct three groups $\Lambda_1$, $\Lambda_2$, $\Lambda_3$, which can all be decomposed as amalgamated products $F_9 \ast_{F_{81}} F_{9}$ and have very few normal subgroups of finite or infinite index. Concretely, $\Lambda_1$ is a simple group, $\Lambda_2$ is not simple but has no non-trivial normal subgroup of infinite index, and $\Lambda_3$ is not simple but has no proper subgroup of finite index.

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