On computability and disintegration

We show that the disintegration operator on a complete separable metric space along a projection map, restricted to measures for which there is a unique continuous disintegration, is strongly Weihrauch equivalent to the limit operator Lim. When a measure does not have a unique continuous disintegrat...

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Veröffentlicht in:Mathematical structures in computer science 2017-12, Vol.27 (8), p.1287-1314
Hauptverfasser: ACKERMAN, NATHANAEL L., FREER, CAMERON E., ROY, DANIEL M.
Format: Artikel
Sprache:eng
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Zusammenfassung:We show that the disintegration operator on a complete separable metric space along a projection map, restricted to measures for which there is a unique continuous disintegration, is strongly Weihrauch equivalent to the limit operator Lim. When a measure does not have a unique continuous disintegration, we may still obtain a disintegration when some basis of continuity sets has the Vitali covering property with respect to the measure; the disintegration, however, may depend on the choice of sets. We show that, when the basis is computable, the resulting disintegration is strongly Weihrauch reducible to Lim, and further exhibit a single distribution realizing this upper bound.
ISSN:0960-1295
1469-8072
DOI:10.1017/S0960129516000098