Black-Box Complexity
lSuppose we are trying to bolster a hypothesis
  T(n) ë O(f(n))
lFrom the definition, we know this means there is a constant c such that
for all n, T(n) < c f(n)
lIf our hypothesis is correct, we therefore expect for all n,
  T(n) / f(n) < c
lWe can simply examine this ratio.