On Dec 29, 2005, at 11:26 AM, David F. Place wrote:

Hi,

I am trying to read _Arrows, Robots, and Functional Reactive Programming_ by Hudak, et al.

http://www.haskell.org/yampa/AFPLectureNotes.pdf

In section 2.1 there are a number of equations of the form:

g’ :: SF A C g’ = arr g = arr f1 >>> arr f2

and

i’ :: SF (A,C) (B,D) i’ = arr i = arr (f1 . fst) &&& arr (f2 . snd) = (arr fst >>> arr f1) &&& (arr snd >>> arr f2)

I can't find any reference to the syntax where the function left hand side is just "space." I'd greatly appreciate any insight.

I'm pretty sure the extra lines are assertions of equality. That is, they are other ways of defining the same function. That isn't legal Haskell syntax as written. Rob Dockins Speak softly and drive a Sherman tank. Laugh hard; it's a long way to the bank. -- TMBG