Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-11-12 07:59 1019dd67

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feat(measure_theory/probability_mass_function): Define a measure assosiated to a pmf (#9966) This PR defines pmf.to_outer_measure and pmf.to_measure, where the measure of a set is given by the total probability of elements of the set, and shows that this is a probability measure.

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