Embedding discrete Markov chains into continuous ones is a famous open problem in probability theory with many applications. Inspired by recent progress, we study the closely related questions of embeddability of real and positive operators on finite and infinite-dimensional spaces.
Operators on anti-dual pairs: Supremum and infimum of positive operators
Bishop-Phelps-Bollobás property for positive operators when the domain is $L_\infty $
Extensions of positive operators and functionals
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