<div dir="ltr"><div class="gmail_extra">On Mon, Dec 14, 2015 at 9:38 PM, martin <span dir="ltr"><<a href="mailto:monkleyon@googlemail.com" target="_blank">monkleyon@googlemail.com</a>></span> wrote:<br><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div id=":zt" class="a3s" style="overflow:hidden">
2) Every arrow a b c is an applicative (a b) c, because comma = (&&&).<br>
Conversely, every applicative that is polymorphic over some "internal"<br>
variable is automatically an arrow, through (&&&) = comma.</div></blockquote></div><br></div><div class="gmail_extra">Where is the proof that (a b) is a Functor?<br><br></div><div class="gmail_extra">Recall that the class method arr -- the closest kin to fmap -- has the type:<br><br>(b -> c) -> a b c.<br></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature">-- Kim-Ee</div></div>
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