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Commit 2020-06-04 15:38 7d803a98

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feat(topology/metric_space/isometry): group structure on isometries (#2950) Closes #2908

Estimated changes

Modified src/topology/metric_space/isometry.lean

added theorem isometric.apply_inv_self

added theorem isometric.coe_mul

added theorem isometric.coe_one

added theorem isometric.inv_apply_self

added theorem isometric.mul_apply