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Commit 2022-03-25 18:48 221796ab

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feat(topology/metric_space/metrizable): define and use a metrizable typeclass (#12934)

Estimated changes

Modified src/topology/instances/ennreal.lean

Modified src/topology/metric_space/metrizable.lean

added theorem embedding.metrizable_space

added theorem topological_space.metrizable_space_of_normal_second_countable