Games orbits play and obstructions to Borel reducibility
Games orbits play and obstructions to Borel reducibility
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游戏轨道游戏和 Borel 可还原性障碍
DOI:
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发表时间:
2016
期刊:
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通讯作者:
Aristotelis Panagiotopoulos
中科院分区:
文献类型:
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作者:
M. Lupini;Aristotelis Panagiotopoulos
We introduce a new, game-theoretic approach to anti-classification results for orbit equivalence relations. Within this framework, we give a short conceptual proof of Hjorth’s turbulence theorem. We also introduce a new dynamical criterion providing an obstruction to classification by orbits of CLI groups. We apply this criterion to the relation of equality of countable sets of reals, and the relations of unitary conjugacy of unitary and selfadjoint operators on the separable infinite-dimensional Hilbert space.