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Please use this identifier to cite or link to this item: http://hdl.handle.net/1813/7465
Title: One-Way Log-Tape Reductions
Authors: Hartmanis, Juris
Immerman, Neil
Mahaney, Stephen R.
Keywords: computer science
technical report
Issue Date: Jul-1978
Publisher: Cornell University
Citation: http://techreports.library.cornell.edu:8081/Dienst/UI/1.0/Display/cul.cs/TR78-347
Abstract: One-way log-tape (1-L) reductions are mappings defined by log-tape Turing machines whose read head on the input can only move to the right. The 1-L reductions provide a more refined tool for studying the feasible complexity classes than the P-time [2,7] or log-tape [4] reductions. Although the 1-L computations are provably weaker than the feasible classes L, NL, P and NP, the known complete sets for those classes are complete under 1-L reductions. However, using known techniques of counting arguments and recursion theory we show that certain log-tape reductions cannot be 1-L and we construct sets that are complete under log-tape reductions but not under 1-L reductions.
URI: http://hdl.handle.net/1813/7465
Appears in Collections:Computer Science Technical Reports
Hartmanis, Juris

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