RelativizedNC |
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Authors: | Christopher B Wilson |
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Affiliation: | (1) Department of Computer and Information Science, University of Oregon, 97403 Eugene, OR, USA |
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Abstract: | This paper introduces a notion of relativized depth for circuit families and discusses issues regarding uniform families of relativized circuits. This allows us to define a version of relativizedNC and compare it under various oracles with relativizedL, NL, andP. We see thatNC
1 is properly contained inL if and only if there exists an oracleA such thatNC
1
A
is properly contained inL
A
. There is an oracleA where the hierarchy collapses,NC
1
A
= NC
A
, and another whereNC
1
A
NC
2
A
NC
A
P
A
. We then construct anA so that, for anyk, NC
1
A
contains a set not inNSPACE
A
(O(n
k
)), suggesting that the notion of relativized space is too weak or that of relativized depth is too strong. |
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Keywords: | |
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