Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-06-16 12:25 0490b432

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refactor(geometry/manifold/instances/circle): split out (topological) group facts (#7951) Move the group and topological group facts about the unit circle in from geometry.manifold.instances.circle to a new file analysis.complex.circle. Delete geometry.manifold.instances.circle, moving the remaining material to a section in geometry.manifold.instances.sphere.

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