A Wikipedia article tells us that:
A problem is regarded as inherently difficult if solving the problem requires a large amount of resources, whatever the algorithm used for solving it.
What is a more elegant, and perhaps more correct, way of expressing the notion “a large amount of ” in a context like this?
EDIT after comments: Maybe what bothers me is the the large amount followed by plural resources. I like a large amount of butter on my morning toast; and I like having a lot of books around; but I’m not so sure I’d say I like having a large amount of books here.
FINALLY I changed the sentence to read
A problem is regarded as inherently difficult if its solution requires significant resources, whatever the algorithm used.