It is shown that for a measurable stochastic process V and a nondecreasing family of σ-algebras 𝒜t there exists a measurable stochastic process V ∗ such that V ∗(t,⋅) is a version of E(V (t,⋅)|𝒜t) for all t.
© Copyright 1977 Pacific Journal of Mathematics. All rights reserved.