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The strong profinite genus of a finitely presented group
can be infinite

#### Martin R. Bridson

#### Submitted for publication, July 2013.

We construct the first examples of finitely-presented, residually-finite groups

G that contain an infinite sequence of non-isomorphic
finitely-presented

subgroups P_n such that each inclusion map
P_n --> G induces an isomorphism of profinite completions.