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A Groszek‐Laver pair of undistinguishable E 0 ‐classes
Author(s) -
Golshani Mohammad,
Kanovei Vladimir,
Lyubetsky Vassily
Publication year - 2017
Publication title -
mathematical logic quarterly
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.473
H-Index - 28
eISSN - 1521-3870
pISSN - 0942-5616
DOI - 10.1002/malq.201500020
Subject(s) - mathematics , extension (predicate logic) , set (abstract data type) , combinatorics , discrete mathematics , computer science , programming language
A generic extension L [ x , y ] of the constructible universe L by reals x , y is defined, in which the union of E 0 ‐classes of x and y is a lightface Π 2 1 set, but neither of these two E 0 ‐classes is separately ordinal‐definable.