Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-01-25 01:08 507c7ffc

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feat(analysis/specific_limits): formula for ∑' n, n * r ^ n (#5835) Also prove that ∑' n, n ^ k * r ^ n is summable for any k : ℕ, ∥r∥ < 1.

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