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Constrained Horn clauses (CHCs) are a fragment of first-order logic with applications to program verification and synthesis. Constrained Horn clauses can be seen as a form of constraint logic programming.[1]
^Angelis, Emanuele De; Fioravanti, Fabio; Gallagher, John P.; Hermenegildo, Manuel V.; Pettorossi, Alberto; Proietti, Maurizio (November 2022). "Analysis and Transformation of Constrained Horn Clauses for Program Verification". Theory and Practice of Logic Programming. 22 (6): 974–1042. arXiv:2108.00739. doi:10.1017/S1471068421000211. ISSN 1471-0684. S2CID 236777105. CHCs are syntactically and semantically the same as constraint logic programs
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