Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2023-01-18 17:47 fb319896

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refactor(geometry/euclidean/angle/oriented/basic): split out rotations (#18212) geometry.euclidean.angle.oriented.basic is 1489 lines long. Reduce it to 1032 lines by splitting out the definition of and results about rotation to a separate file. (No results in this file involve rotation in their proofs unless it's also involved in the statement.) There are no changes to API or proofs.

Estimated changes

deleted theorem orientation.det_rotation
deleted theorem orientation.neg_rotation
deleted theorem orientation.rotation_map
deleted theorem orientation.rotation_pi
deleted theorem orientation.rotation_symm
deleted theorem orientation.rotation_zero