On the Importance of Being II2-Hard

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Abstract
In this column, we show how a variety of interesting results in theory of computation all follow from a simple observation about $\prod _{2}$-complete sets of total machines. We easily derive: a) representation independent independence results, b) non-recursive succinctness relations between different representations of languages, c) the existence of incomplete languages in various complexity classes.
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1989-01
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Cornell University
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computer science; technical report
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http://techreports.library.cornell.edu:8081/Dienst/UI/1.0/Display/cul.cs/TR89-961
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technical report
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