You are right, but I would state it more like, the arrows cannot be plain
HM arrows if the equations are all true.

Lets assume I was mistaken when I said they are HM arrows, and focus on the
implications of the equations.

K.


On 31 March 2015 at 17:05, Matt Oliveri <[email protected]> wrote:

> On Tue, Mar 31, 2015 at 11:44 AM, Keean Schupke <[email protected]> wrote:
> > Clarification, so:
> >
> > 1. (a -> b -> c -> d)  U  (a b c => d) = (a b c => d)
> >
> > 2. (a -> b) U (a b c => d) = _|_
> >
> > 3. (a -> b) U (a -> b -> c -> d) = (a =>b -> c -> d)
>
> (x U y) is notation for "unify x with y"? If so, then sorry, but I
> think you're mistaken. Those equations cannot all be true if the
> arrows are HM arrows. See my previous email.
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