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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
As long as < moves the pointer in the opposite direction of >, it doesn't matter which moves it to the left and which moves it to the right.
The x^0 test in Haskell ignores the fact that 0^0 is not well-defined, since 0^x == 0 for all non-zero x and x^0 == 1 for all non-zero x.
EDIT: After further testing (and Hoogling) I suggest fixing the test by changing "NonNegative x" to "Positive x".
Your lambda, (\f x -> f x), would be better written as ($).