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- advances on drops
[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / etc_new / drops / drops.etc
1 lemma drop_inv_refl: ∀L,l,m. ⬇[Ⓕ, l, m] L ≡ L → m = 0.
2 /2 width=5 by drop_inv_length_eq/ qed-.
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