Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-06-11 13:26 e35438bb

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feat(analysis): Cauchy sequence and series lemmas (#7858) from LTE. Mostly relaxing assumptions from metric to pseudo-metric and proving some obvious lemmas. eventually_constant_prod and eventually_constant_sum are duplicated by hand because to_additive gets confused by the appearance of 1. In norm_le_zero_iff' {G : Type*} [semi_normed_group G] [separated_space G] and the following two lemmas the type classes assumptions look silly, but those lemmas are indeed useful in some specific situation in LTE.

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