Find an example of an infinitely generated discrete subgroup of ${\rm SL}(2,\Bbb R)$.

Asked Feb 17 '20 at 16:32

Active Feb 17 '20 at 16:40

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I want to find an example of an infinitely generated discrete subgroup of ${\rm SL}(2,\Bbb R)$ but I haven't managed to find such a subgroup.

Please would someone help me to find such subgroup?

edited Feb 17 '20 at 16:40

Shaun

asked Feb 17 '20 at 16:32

Roi

1

(Optional) hint: there exist finitely generated groups with infinitely generated subgroups – YCor Feb 17 '20 at 18:46
I am sure this was asked earlier. – Moishe Kohan Feb 17 '20 at 22:56
https://math.stackexchange.com/questions/1986435/kernel-of-an-epimorphism-form-a-surface-group-to-a-free-group/2025749#2025749 – Moishe Kohan Feb 18 '20 at 02:50

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