In W. Hoeffding's 1963 paper* he gives the well known inequality:
P(\bar{x}-\mathrm{E}[x_i] \geq t) \leq \exp(-2t^2n) \ \ \ \ \ \ (1),
where \bar{x} = \frac{1}{n}\sum_{i=1}^nx_i, x_i\in[0,1]. x_i's are independent.
Following this theorem he gives a corollary for the difference of two...