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* [[Formal semantics of programming languages]] — an overview
* [[Hoare logic]] — the best-known axiomatic semantics
* [[Refinement calculus]], an extension of [[guarded commands]] (and Hoare logic) exploiting the [[ Lattice_(order) | lattice ]] structure of predicate transformers (for "refinement" order).
* [[Dynamic_logic_(modal_logic)|Dynamic logic]], where predicate transformers appear as modalities (in the sense of [[Modal logic]]).
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