Zulip Chat Archive
Stream: maths
Topic: PiLp complete space?
Robert Maxton (Jun 12 2025 at 05:41):
- Is it in fact true that
PiLptakes a collection of complete spaces to a complete space in general/for 'most' values ofp? I would be quite surprised to find out that e.g. normal Euclidean space is not complete, but I have been quite surprised before, and there is a somewhat suspicious pattern of instances for very specific cases. - If it is true, what's the easiest way to show it?
- Alternatively, maybe we should open a discussion about just changing the
pused in docs#Topology.RelCWComplex and thepused in docs#TopCat.RelativeCWComplex to be the same....
Jireh Loreaux (Jun 12 2025 at 13:17):
It's complete. The uniformity on PiLp is precisely the uniformity on the pi type.
Jireh Loreaux (Jun 12 2025 at 13:19):
It looks like we have written it for Prod here docs#WithLp.instProdCompleteSpace but not for Pi
Robert Maxton (Jun 12 2025 at 22:02):
Good to know. I ended up working around it, but might put some time towards building a general instance then.
Jireh Loreaux (Jun 12 2025 at 22:13):
I'm saying it's trivial to build the CompleteSpace instance. It's just inferInstanceAs ...
Robert Maxton (Jun 12 2025 at 22:14):
Oh, well. That's helpful. I'll definitely PR a copy for Pi then
Robert Maxton (Jun 12 2025 at 22:14):
Thanks!
Last updated: Dec 20 2025 at 21:32 UTC