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2021-03-29 16:43:24 × Tene quits (~tene@poipu/supporter/slacker/tene) (Ping timeout: 246 seconds)
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2021-03-29 16:46:10 <sclv> psa btw, hackage web interface is down while we fix disk storage issues
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2021-03-29 16:46:21 × kritzefitz quits (~kritzefit@212.86.56.80) (Client Quit)
2021-03-29 16:46:32 <Gurkenglas> do dependent types get me "that subtype of A defined by the property f : A -> Bool"? (or perhaps A -> ())
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2021-03-29 16:50:25 <dolio> A -> () is isomorphic to () in most dependently typed languages.
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2021-03-29 16:52:44 <dolio> The Sierpinski type would need to be defined instead.
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2021-03-29 16:54:30 <dolio> Or a Sierpinski type, since there wouldn't be a unique choice in a lot of cases.
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2021-03-29 16:55:25 × Tene quits (~tene@mail.digitalkingdom.org) (Changing host)
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2021-03-29 16:56:38 × ukari quits (~ukari@unaffiliated/ukari) (Ping timeout: 240 seconds)
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2021-03-29 17:03:24 × codygman__ quits (~user@209.251.131.98) (Remote host closed the connection)
2021-03-29 17:03:28 × nbloomf quits (~nbloomf@2600:1700:ad14:3020:cca4:232:630d:d55c) (Quit: My MacBook has gone to sleep. ZZZzzz…)
2021-03-29 17:03:35 ski . o O ( "First Steps in Synthetic Computability Theory" by Andrej Bauer in 2004 at <http://math.andrej.com/2005/05/08/first-steps-in-synthetic-computability-theory/> )
2021-03-29 17:03:51 gitgood joins (~gitgood@80-44-12-39.dynamic.dsl.as9105.com)
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2021-03-29 17:06:52 <monochrom> I think when you wrote "A -> ()" you had "relation between A and ()" in mind.
2021-03-29 17:06:56 elfets joins (~elfets@ip-37-201-23-96.hsi13.unitymediagroup.de)
2021-03-29 17:07:32 <monochrom> Because I recently used that in parametricity theorems to obtain induction/elimination principles. :)
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2021-03-29 17:12:39 × DTZUZU_ quits (~DTZUZO@207.81.119.43) (Ping timeout: 268 seconds)
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2021-03-29 17:12:56 × chele quits (~chele@ip5b40237d.dynamic.kabel-deutschland.de) (Remote host closed the connection)
2021-03-29 17:13:32 jakalx parts (~jakalx@base.jakalx.net) ("Error from remote client")
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2021-03-29 17:17:13 <dolio> Well, you don't just want any relation.
2021-03-29 17:17:31 <dolio> Because that is A -> Ω.
2021-03-29 17:17:36 <dolio> Not A -> Σ
2021-03-29 17:17:37 × heatsink quits (~heatsink@2600:1700:bef1:5e10:f0bc:f236:90c7:a6f5) (Ping timeout: 258 seconds)
2021-03-29 17:19:57 <dolio> You can kind of pretend that () is Σ in some ways in something like Haskell, although there is no good encoding of the other truth value types.
2021-03-29 17:20:29 <dolio> At least, I think.
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2021-03-29 17:53:24 <dmoerner> hackage is down, I guess
2021-03-29 17:53:45 <tomsmeding> dmoerner: disk space issues, it's being worked on
2021-03-29 17:53:58 <tdammers> talk about spofs...
2021-03-29 17:54:23 <dmoerner> tomsmeding: no problem.
2021-03-29 17:54:26 × stree quits (~stree@68.36.8.116) (Ping timeout: 260 seconds)
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2021-03-29 17:54:47 <tomsmeding> Does haskell have some kind of "injective type classes"? In particular, given 'instance C b => C (a, b)' and the information 'C (a, b)', I'd like to be able to infer 'C b', but GHC can't
2021-03-29 17:55:01 ddellaco_ joins (~ddellacos@ool-44c73afa.dyn.optonline.net)
2021-03-29 17:55:14 <Gurkenglas> monochrom, by A -> () I mean the monotonic functions from A to (), not necessarily strict, one-to-one with the Scott-open sets in A
2021-03-29 17:55:34 <tomsmeding> (my actual use case has 'a -> b' instead of '(a, b)', but I can't imagine that to make a difference)
2021-03-29 17:55:38 sgibber2018 joins (d055ed90@208.85.237.144)

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