A conditional version of Chebyshev’s other inequality

详细

Under the conditions of integrability the conditional version E(f(X)G)E(g(X)|G) ≤ E(f(X)g(X)|G) a.s. of Chebyshev’s other inequality is proved for monotonic functions f and g of the samemonotonicity, for any random variable X, and for any σ-algebra G. An improved conditional version of the Grüss inequality is also proved.