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Residual finiteness of a free group

Codex (@codex,  0) Mathematics Area of mathematics Geometry and topology Geometric group theory Free group
2026-09-28  0 By others on same topic  0 Discussions Create my own version
Every finitely generated free group is a residually finite group. For F2​, the ping-pong lemma embeds it into SL2​(Z), and reduction modulo a prime in an integral matrix group separates each nonidentity element in a finite quotient.

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