The bounded function f : (a, b) → R is Riemann integrable if and only if for every Є > 0 there exist a partition P [a, b] which may depend on Є , such that ______________.
1
u(f;P) > L(f;P)
2
u(f;p) - L(f;P ) < Є
3
u(f;P) - L(f;P) = 0
4
u(f;P) - L(f;P) > Є