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first-order and higher-order logic, model theory, set theory, proof theory, computability theory, formal languages, definability, interplay of syntax and semantics, constructive logic, intuitionism, philosophical logic, modal logic, completeness, Gödel incompleteness, decidability, undecidability, theories of truth, truth revision, consistency.
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Deciding homomorphic images of De Bruijn graphs
The De Bruijn graph $B_n$ of
dimension $n$ (on the two-letter alphabet) is defined as the directed graph on
$2^n$ vertices and $2^{n+1}$ edges, where for every $w = w_0 \dots w_n \in
2^{n+1}$ we put a …