Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-02-10 15:17 d5e2029d

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refactor(linear_algebra/basic): extract definitions about pi types to a new file (#6130) This makes it consistent with how the prod definitions are in their own file. With each in its own file, it should be easier to unify the APIs between them. This does not do anything other than copy across the definitions.

Estimated changes

deleted def linear_map.diag
deleted theorem linear_map.infi_ker_proj
deleted theorem linear_map.ker_pi
deleted def linear_map.pi
deleted theorem linear_map.pi_apply
deleted theorem linear_map.pi_comp
deleted theorem linear_map.pi_eq_zero
deleted theorem linear_map.pi_zero
deleted def linear_map.proj
deleted theorem linear_map.proj_apply
deleted theorem linear_map.proj_pi
deleted theorem linear_map.update_apply