cantor...

[helm.git] / helm / software / matita / nlibrary / topology / igft.ma

diff --git a/helm/software/matita/nlibrary/topology/igft.ma b/helm/software/matita/nlibrary/topology/igft.ma
index d0068dbf7e5f367c05f1b72616f132091b78834a..21194951bc91831f211012245fae1737f245f311 100644 (file)
--- a/helm/software/matita/nlibrary/topology/igft.ma
+++ b/helm/software/matita/nlibrary/topology/igft.ma
@@ -982,6 +982,8 @@ We now proceed with the proof of the infinity rule.
 D*)
 
 
+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.