The four statutory classes of invention are process, machine, manufacture and composition of matter, with exceptions for abstract ideas, physical phenomena and laws of nature.
Whilst abstract ideas are not eligible for patenting, I understand methods and products that employ abstract ideas to perform real world function, may well be.
Where can I see the statutory class under which patents were granted?
Was this patent for the VIX volatility index and derivatives based thereon granted because the abstract notion of volatility was employed to perform the real world function of derivative trading?
Am I missing something in the document?