Computable d-Σ2\Sigma_2 Scott sentences for finitely presented groups

Let GG be a finitely presented computable group. A computable dd-Σ2\Sigma_2 Scott sentence is a Scott sentence for GG that is the conjunction of a computable Σ2\Sigma_2 sentence and a computable Π2\Pi_2 sentence. Finitely presented group Scott sentence conjecture. Every finitely presented computable group GG has a computable dd-Σ2\Sigma_2 Scott sentence. This question arose because a finitely generated computable group is known to have a computable Σ3\Sigma_3 Scott sentence that is optimal, while the known counterexample is not finitely presented; the paper describes evidence for a positive answer but leaves the finitely presented case open.

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Primary source

Julia Knight and Vikram Saraph, “Scott sentences for certain groups”, arXiv:1606.06353 (2017).

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