From: Thomas Streicher <stre...@mathematik.tu-darmstadt.de>
To: Martin Escardo <escardo...@googlemail.com>
Cc: "HomotopyT...@googlegroups.com" <HomotopyT...@googlegroups.com>
Subject: Re: [HoTT] Does MLTT have "or"?
Date: Wed, 3 May 2017 16:48:50 +0200 [thread overview]
Message-ID: <20170503144850.GE24201@mathematik.tu-darmstadt.de> (raw)
In-Reply-To: <d43ff886-58d8-29ce-b24e-c74d9a22c93c@googlemail.com>
> What you are saying is that there is model where general propositional
> truncations don't exist, but "or" does. Right?
yes
> How difficult is to get a model where "or" doesn't exist either?
depends on what "or" is! in my model Prop has or by impredicativity
but this or doen't coincide with sums on the level of types.
Thomas
next prev parent reply other threads:[~2017-05-03 14:56 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-02 9:09 Martin Escardo
2017-05-02 19:04 ` [HoTT] " Michael Shulman
2017-05-03 6:47 ` Martin Escardo
2017-05-12 18:10 ` Martin Escardo
2017-05-12 18:41 ` Martin Escardo
2017-05-13 21:46 ` Michael Shulman
2017-05-14 9:54 ` stre...
2017-05-16 6:20 ` Michael Shulman
2017-05-03 10:55 ` Thomas Streicher
2017-05-03 14:25 ` Martin Escardo
2017-05-03 14:48 ` Thomas Streicher [this message]
2017-05-03 15:04 ` Martin Escardo
2017-05-03 12:17 ` Andrew Polonsky
2017-05-03 12:24 ` [HoTT] " Martin Escardo
2017-05-03 12:24 ` Michael Shulman
2017-05-06 13:51 ` Andrew Swan
2017-05-07 13:49 ` [HoTT] " Martin Escardo
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