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@lua-vr lua-vr commented Jun 20, 2025

@oliver-butterley should those two be pushed to Mathlib.Order.Filter.Basic or use the existing EventuallyEq.add? (continuing discussion in Zulip)

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I never looked at the FilterPR file! Oops.

My personal opinion is that mul_right and mul_left could be added to Mathlib.Order.Filter.Basic but I'm not a mathlib expert.

From a practical point of view I would suggest opening a PR to mathlib which adds these two lemmas. As a PR it is much easier for experts to give feedback.

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Great improvement!

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