Discussion of Homotopy Type Theory and Univalent Foundations
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From: Brian Sanderson <brianjsanderson@gmail.com>
To: Homotopy Type Theory <HomotopyTypeTheory@googlegroups.com>
Subject: Re: [HoTT] Homotopy type of simply connected spaces.
Date: Fri, 11 Jan 2019 03:49:06 -0800 (PST)	[thread overview]
Message-ID: <d2f00740-1c9c-47a2-b731-c8276ceaebd7@googlegroups.com> (raw)
In-Reply-To: <CAOvivQxzLoy=574snuvrv4x5+wOsnXKoeR=DOi_F84r=nGapoQ@mail.gmail.com>


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Thanks for the references. So am I allowed to say a type is simply 
connected if any two paths are equal, or is that a meta statement which has 
no meaning within type theory.

On Thursday, 10 January 2019 21:12:13 UTC, Michael Shulman wrote:
>
> Yes, you have to truncate the equality.  See section 7.5 of the HoTT 
> Book, and also Exercise 7.6. 
>
> On Thu, Jan 10, 2019 at 12:36 PM Brian Sanderson 
> <brianjs...@gmail.com <javascript:>> wrote: 
> > 
> > The type of a simply connected space would seem to make it just a set as 
> any two paths with the same endpoints would be homotopic. I see that there 
> would not be a continuous function from the space of pairs of paths to 
> homotopies between them. What would the type of a simply connected space 
> look like? Can I say in type theory any two equalities are equal without 
> having a function? 
> > 
> > -- 
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  reply	other threads:[~2019-01-11 11:49 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-10 20:36 Brian Sanderson
2019-01-10 21:11 ` Michael Shulman
2019-01-11 11:49   ` Brian Sanderson [this message]
2019-01-11 12:01     ` Cory Knapp

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