[Haskell-beginners] Usage of $

[Shishir Srivastava]

Hi,

Can someone please highlight how '$' is making the difference in the
execution of this function. With $ in place the function runs fine but
without $ for large input values the function overflows the stack.

--------
s mp 1 = 4
s mp n = ((s mp $ n-1)^2-2) `mod` mp
--------

I cannot understand the difference between
(s mp $ n-1) and (s mp n-1)

Thanks,
Shishir Srivastava
 +44 (0) 750 127 5019
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