Commit 0ee40447 authored by Robbert Krebbers's avatar Robbert Krebbers

More consistent notations for curried relations.

For example, instead of:

  Notation "( X ⊆ )"

We now use:

  Notation "( X ⊆)"

We were already doing this for = and ≡.

This solves some conflicts with the notations of MetaCoq.
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