Oh, yes! Exactly, thanks to all!!

> Hi!
>
> I think you're looking for Data.Function.on:
> http://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Function.html#v:on
>
> On 04/12/2017, Baa <aquagnu@gmail.com> wrote:
> > Hello, All!
> >
> > Does Haskell have some "short-form" for such call: `f (g x) (g x)`,
> > for example:
> >
> >   compare (snd x) (snd x)
> >
> > Looks like combinatory logic or `ap` but not exactly...
> >
> > ===
> > Best regards, Paul
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> >
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