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I think I'm now meant to create an empty "holding" PR in mathlib4 - but it doesn't seem to be possible to create empty PRs? |
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You should just close this and PR to mathlib 4 instead. It will be less work for you. |
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For files that exist in both mathlib and mathlib4 I thought it was mandatory to get the PR merged in mathlib and then forward port to mathlib4? |
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Closing in favour of leanprover-community/mathlib4#5631 |
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closure.monowhich asserts that ift₁ ≤ t₂for topologiest₁,t₂, then the closure of a set int₁will be a subset of the closure of the set int₂. Analogous tois_open.monoandis_closed.mono.See discussion