helm/software/matita/contribs/formal_topology/overlap/notation.ma

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   4 (*      ||A||       A project by Andrea Asperti                           *)
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  14
  15 notation "hvbox (r \sub \c)"  with precedence 90 for @{'concr_rel $r}.
  16 notation "hvbox (r \sub \f)"  with precedence 90 for @{'form_rel $r}.
  17
  18 definition hide ≝ λA:Type.λx:A.x.
  19
  20 interpretation "hide" 'hide x = (hide ? x).