Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-11-22 18:26 8d9836ff

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feat(geometry/euclidean/angle/sphere): affine circle theorems (#17279) Add (oriented) Euclidean affine space versions of "angle at center of a circle equals twice angle at circumference" and "angles in same segment are equal" / "opposite angles of a cyclic quadrilateral add to π" (which were previously only present for angles between vectors, not for angles between points in an oriented Euclidean affine space).

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