<div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">On 22 February 2015 at 00:04, Brandon Allbery <span dir="ltr"><<a href="mailto:allbery.b@gmail.com" target="_blank">allbery.b@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><div class="gmail_extra">You can't, at present. (Note: Typeclasses are not OOP classes; `class (Num a, Group a) => Additive a` does not declare superclasses, but prerequisites.)<span><font color="#888888"><br clear="all"></font></span></div></blockquote><div> </div></div><font color="#888888">In logic we would say (Num a AND Group a) is a necessary condition for ( Additive a) => (Num a AND Group a) to hold. </font><br><br></div></div>
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