-- Eq
==, /=
-- Ord
<, <=, >, >=, min, max
-- Show
show :: a -> String
-- Read
read :: String -> a
> read "False" :: Bool
False
> read "123":: Int
123
-- Num
+, -, *, negate, abs, signum
> signum (-3)
-1
> 1 + 2.0
3.0
> negate (-3)
3
-- Integral
> div 7 2
3
> mod 7 2
1
-- Kehrwert
> recip 2.0
0.5