Dahlqvist, FredrikPattinson, Dirk2026-01-012026-01-0197836423707480302-9743https://hdl.handle.net/1885/733799001This paper presents a first step towards completeness-via-canonicity results for coalgebraic modal logics. Specifically, we consider the relationship between classes of coalgebras for ω-accessible endofunctors and logics defined by Sahlqvist-like frame conditions. Our strategy is based on conjoining two well-known approaches: we represent accessible functors as (equational) quotients of polynomial functors and then use canonicity results for boolean algebras with operators to transport completeness to the coalgebraic setting.16encanonicitycoalgebraic modal logiccompletenessModal logicSahlqvist formula201310.1007/978-3-642-37075-5_1384874402409