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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.
Works quite well for close points. The whole ε thing is actually unnecessary, because
Rationals are exact.Your lambda, (\f x -> f x), would be better written as ($).
Clever, but doesn't work for very close points.
where check a = a * a + a == 2 * n
This is enough, and the value of `check a' is a Bool.
I think foldl' should be a better idea to avoid stack overflow