symta tutorial plz

i really want to learn symta, but the "tutorial" stolen from arc's tutorial is a piece of shit.
plz explain it from the beginning in a way that can be understood without previous knowledge of lisp. thank you!

>>8
instance Num a => Num (b -> a) where
  fromIntegral = const . fromIntegral

>>13
You mena fromInteger.
And yes, I didn't think of it, it's like defining __call__ for int, terrible and marvelous at the same time!