MathSciNet bibliographic data MR1856748 03D28 (03F35) Downey, Rod; Hirschfeldt, Denis R.; Lempp, Steffen; Solomon, Reed A \$\Delta\sp 0\sb 2\$$\Delta\sp 0\sb 2$ set with no infinite low subset in either it or its complement. J. Symbolic Logic 66 (2001), no. 3, 1371–1381. Article

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