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  5. An Example of a Theorem that has Contradictory Relativizations and a Diagonalization Proof

An Example of a Theorem that has Contradictory Relativizations and a Diagonalization Proof

File(s)
89-1059.ps (132.5 KB)
89-1059.pdf (414.02 KB)
Permanent Link(s)
https://hdl.handle.net/1813/6859
Collections
Computer Science Technical Reports
Author
Chang, Richard
Abstract

We construct a computable space bound $S(n)$, with $n^{2} less than S(n) less than n^{3}$ and show by diagonalization that DSPACE [$S(n)$] = DSPACE [$S(n)$ log $n$]. Moreover, we can show that there exists an oracle $A$ such that DSPACE [$S(n)$] $\neq$ DSPACE$^{A}$[$S(n)$ log $n$]. This is a counterexample to the belief that is a theorem has contradictory relativizations, then is cannot be proved using standard techniques like diagonalization [7].

Date Issued
1989-11
Publisher
Cornell University
Keywords
computer science
•
technical report
Previously Published as
http://techreports.library.cornell.edu:8081/Dienst/UI/1.0/Display/cul.cs/TR89-1059
Type
technical report

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