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2025-10-01 15:19:31 UTC
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Owen Lynch on Nostr: nprofile1q…d6kk0 I eventually plan to relax "convertable" to "is a subtelescope". ...

I eventually plan to relax "convertable" to "is a subtelescope".

The point is though that there is a phase distinction whose open modality "forgets singletons", and first we check subtyping (or convertability) with respect to that, and then we check whether an eta-expanded element of A is an element of B. The eta-expansion "observes" whatever refinements have been put on, in any order, because eta expanding a neutral in a singleton type gives you the unique element of that singleton type.