Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-12-23 02:02 f00007dc

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feat(analysis/normed_space/pointwise): more on pointwise operations on sets in normed spaces (#10820) Also move all related results to a new file analysis/normed_space/pointwise, to shorten normed_space/basic a little bit.

Estimated changes

modified theorem preimage_add_ball
modified theorem preimage_add_closed_ball
added theorem ball_add_singleton
added theorem metric.bounded.add
added theorem singleton_add_ball
deleted theorem smul_ball
deleted theorem smul_closed_ball'
deleted theorem smul_closed_ball
deleted theorem smul_sphere'
deleted theorem smul_sphere
added theorem metric.bounded.smul
added theorem set_smul_mem_nhds_zero
added theorem smul_ball
added theorem smul_closed_ball'
added theorem smul_closed_ball
added theorem smul_sphere'
added theorem smul_sphere