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Shore's splitting theorem: Let A be <math>\alpha</math> recursively enumerable and regular. There exist <math>\alpha</math> recursively enumerable <math>B_0,B_1</math> such that <math>A=B_0 \cup B_1 \wedge B_0 \cap B_1 = \varnothing \wedge A \not\le_\alpha B_i (i<2).</math>
Shore's density theorem: Let ''A'', ''C'' be α-regular recursively enumerable sets such that <math>\scriptstyle A <_\alpha C</math> then there exists a regular α-recursively enumerable set ''B'' such that <math>\scriptstyle A <_\alpha B <_\alpha C</math>.
==Reference==
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