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arxiv: 1401.3146 · v1 · pith:3T7AGMS3new · submitted 2014-01-14 · 💻 cs.IT · math.IT· math.ST· stat.TH

The Blackwell relation defines no lattice

classification 💻 cs.IT math.ITmath.STstat.TH
keywords blackwellboundslatticechannelscorrespondingdefinesequivalenceexist
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Blackwell's theorem shows the equivalence of two preorders on the set of information channels. Here, we restate, and slightly generalize, his result in terms of random variables. Furthermore, we prove that the corresponding partial order is not a lattice; that is, least upper bounds and greatest lower bounds do not exist.

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