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Unbounded Class of Orbit Equivalence Relations

set-theory reference-request borel-sets descriptive-set-theory lo.logic

may 5 12 at 10:46 ftonti 182●7

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Example of two structures

model-theory lo.logic

nov 30 11 at 14:22 Simon Thomas 6,039●1●18●36

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Perfect set property for projective hierarchy

set-theory descriptive-set-theory lo.logic

aug 10 11 at 0:25 Dave Marker 1,935●7●8