R J wrote:
Here's another Bird problem that's stymied me:
The function "inits" computes the list of initial segments of a list;
its type is inits :: [a] -> [[a]]. What is the appropriate naturality
condition for "inits"?
Just use the free theorem associated to type [a] -> [[a]] in Janis
Voigtlaender’s free theorem generator
http://linux.tcs.inf.tu-dresden.de/~voigt/ft
and see the outcome when all permissible relation variables are
functions (at the bottom of the screen).
jno
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