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The Formula Complexity of Subgraph Isomorphism Rossman, Benjamin
Description
I will report recent progress on the formula complexity of the (colorful) subgraph isomorphism problem. (1) In previous work with Li and Razborov (FOCS 2014), we showed that the AC0-circuit complexity of G-subgraph isomorphism is n^{Theta~(treewidth(G))}. In new work, I show that the AC0-formula complexity of G-subgraph isomorphism is n^{poly(treedepth(G))} via a generalization of the "pathset technique" of R. (STOC 2014). This result has connections to finite model theory (a new proof of an improved homomorphism preservation theorem) and graph minor theory (a new excluded-minor approximation of bounded treedepth, joint with Ken-ichi Kawarabayashi). (2) Another extension of the “pathset technique” gives optimal size-depth trade-offs, including a tight n^{Omega(dk^{1/d})} formula-size lower bound for distance-k st-connectivity for small d and k, improving recent results of Chen et al (STOC 2016).
Item Metadata
Title |
The Formula Complexity of Subgraph Isomorphism
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Creator | |
Publisher |
Banff International Research Station for Mathematical Innovation and Discovery
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Date Issued |
2016-09-05T15:36
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Description |
I will report recent progress on the formula complexity of the (colorful) subgraph isomorphism problem.
(1) In previous work with Li and Razborov (FOCS 2014), we showed that the AC0-circuit complexity of G-subgraph isomorphism is n^{Theta~(treewidth(G))}. In new work, I show that the AC0-formula complexity of G-subgraph isomorphism is n^{poly(treedepth(G))} via a generalization of the "pathset technique" of R. (STOC 2014). This result has connections to finite model theory (a new proof of an improved homomorphism preservation theorem) and graph minor theory (a new excluded-minor approximation of bounded treedepth, joint with Ken-ichi Kawarabayashi).
(2) Another extension of the “pathset technique” gives optimal size-depth trade-offs, including a tight n^{Omega(dk^{1/d})} formula-size lower bound for distance-k st-connectivity for small d and k, improving recent results of Chen et al (STOC 2016).
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Extent |
26 minutes
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Type | |
File Format |
video/mp4
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Language |
eng
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Notes |
Author affiliation: University of Toronto
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Series | |
Date Available |
2017-03-06
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0343088
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Faculty
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International