([ f g) y <=> (f g) y

Yes.

But not for the dyadic case:

x ([ f g) y <=> x f x g y

but

x (f g) y <=> x f g y


Henry Rich


On 8/19/2012 1:47 PM, David Vaughan wrote:
If the verb train has an even number of verbs in it, then it is called a hook.

(f g) y <=> y f g y   NB. monadic hook

x (f g) y <=> x f g y   NB. dyadic hook

See http://www.jsoftware.com/help/dictionary/dictf.htm

Also, a hook can always (I believe) be turned into a fork by adding the [ verb 
to the left of the train (has to be [ and not ] because of the dyadic case):

([ f g) y <=> (f g) y

The situation is similar for the dyadic case.

___________________________

David Vaughan

On 19 Aug 2012, at 18:21, Owen Marschall <[email protected]> wrote:

Hey all, J beginner here. In the first circuit lab, I encountered the verb 
(-|.)"1, and in trying to figure out its meaning, I discovered that (-|.) noun 
is different from -|. noun. I'm familiar with forking, but this only involves two 
verbs. Can someone explain this to me?

Thanks,
Owen
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