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Tag Archives: measure theory
Introduction to Wasserstein metric (earth mover’s distance)
Table of Contents 1. the cost of moving one particle 2. The cost of moving a finite collection of particles of total mass 1. 3. coupling 4. composing 5. definition of the Wasserstein distance 6. Moving a collection of particles … Continue reading
DoobDynkin Lemma for probability space
Table of Contents 1. Proof 1 2. Proof 2 3. Proof 3 4. Uniqueness of H 5. applications Let f, g be measurable functions from a probability space to measurable spaces and respectively. Consider the following three conditions: (1) (in … Continue reading
Proofs of DoobDynkin Lemma
Table of Contents 1. uniqueness of H 2. counterexamples 3. proof when g has a countable range, with nice Y 4. proof when Y is the Cantor space 5. proof when Y is the unit interval 6. proof for standard … Continue reading
mod 0 equivalence of subsigmaalgebras and gotchas
Table of Contents 1. closure of a subsigmaalgebra 2. closed sub sigma algebra 3. mod zero equivalence of sub sigma algebras When we are building some theory involving measures, there are cases where we should ignore null sets (sets of … Continue reading