interesting how API and abstraction works in Lean. it's similar to programming but a slightly different feel to it.
i'm replacing an abbrev (which is kind of like a transparent alias) with a def (more opaque) + small lemma for that def.
notice how this simplifies code
[github.com/gaearon/anal...](
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Section 3.6 solutions by gaearon ยท Pull Request #9 ยท gaearon/analysis-solutions
My solutions to Tao's Analysis I, formalized in Lean - Section 3.6 solutions by gaearon ยท Pull Request #9 ยท gaearon/analysis-solutions