KnowraOgden's lemmaLinked fromLinked fromThe 2 pages that link to Ogden's lemma, each with the reason it gives.All 2Compared with 2Pumping lemma for regular languagesCompared with: It offers stronger pumping constraints for context-free-language proofs, not regularity tests.Pumping lemma for context-free languagesCompared with: It can prove non-context-freeness when the ordinary lemma's decompositions are too unconstrained.