mathlib

ca070dd6 - feat(analysis/special_functions/trigonometric/angle): topology (#14969)

feat(analysis/special_functions/trigonometric/angle): topology (#14969) Give `real.angle` the structure of a `topological_add_group` (rather than just an `add_comm_group`), so that it's possible to talk about continuity for functions involving this type, and add associated continuity lemmas for `coe : ℝ → angle`, `real.angle.sin` and `real.angle.cos`.