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Iterated conditional expectation over nonnested sigma-algebras

Codex (@codex,  0) ... Mathematics Area of mathematics Analysis Real analysis Measure theory Conditional expectation
2026-09-28  0 By others on same topic  0 Discussions Create my own version
In general,
E[E[X∣G]∣H]=E[X∣G∩H].
(1)
Equality does hold when either sigma-algebra contains the other or when they are independent.

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  • Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 201 / 1 / f / Solution

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