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Graph 2-isomorphism is NP-complete

✍ Scribed by P.Frances Yao


Book ID
113162136
Publisher
Elsevier Science
Year
1979
Tongue
English
Weight
532 KB
Volume
9
Category
Article
ISSN
0020-0190

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We prove that the graph isomorphism problem restricted to trees and to colored graphs with color multiplicities 2 and 3 is many-one complete for several complexity classes within NC 2 . In particular we show that tree isomorphism, when trees are encoded as strings, is NC 1 -hard under AC 0 -reductio