Change notations of big_ops for upred.
Rationale: to make the code closer to what is on paper, I want the notations to look like quantifiers, i.e. have a binder built-in. I thus introduced the following notations: [★ map] k ↦ x ∈ m, P [★ set] x ∈ X, P The good thing - contrary to the notations that we had before that required an explicit lambda - is that type annotations of k and x are now not printed making goals much easier to read.
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