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diff --git a/helm/software/matita/nlibrary/topology/igft.ma b/helm/software/matita/nlibrary/topology/igft.ma
index 5032471e11a9577150873ee9b9f46b2abf4aa24d..feccae4786bb3ecc5e7ced048b79262209bdda82 100644 (file)
--- a/helm/software/matita/nlibrary/topology/igft.ma
+++ b/helm/software/matita/nlibrary/topology/igft.ma
@@ -928,6 +928,7 @@ alias symbol "covers" = "new covers set".
 alias symbol "covers" = "new covers".
 alias symbol "covers" = "new covers set".
 alias symbol "covers" = "new covers".
+alias symbol "covers" = "new covers set".
 ntheorem new_coverage_infinity:
   ∀A:nAx.∀U:Ω^A.∀a:A. (∃i:𝐈 a. 𝐈𝐦[𝐝 a i] ◃ U) → a ◃ U.
 #A; #U; #a;                                   (** screenshot "n-cov-inf-1". *)