Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-04-18 17:14 5c75390e

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feat(data/real/ennreal): Order properties of addition (#13371) Inherit algebraic order lemmas from with_top. Also protect ennreal.add_lt_add_iff_left and ennreal.add_lt_add_iff_right, as they should have been.

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