Using fractional calculus we define integrals of the form ∫ b a f(xt)dyt, where x and y are vector-valued Hölder continuous functions of order β ∈ ( 1 3 , 1 2 ) and f is a continuously differentiable function such that f ′ is λ-Höldr continuous for some λ > 1 β − 2. Under some further smooth conditions on f the integral is a continuous functional of x, y, and the tensor product x ⊗ y with respe...