- Library Home /
- Search Collections /
- Open Collections /
- Browse Collections /
- BIRS Workshop Lecture Videos /
- On vanishing patterns in Betti tables of edge ideals
Open Collections
BIRS Workshop Lecture Videos
BIRS Workshop Lecture Videos
On vanishing patterns in Betti tables of edge ideals Nevo, Eran
Description
Many important invariants of ideals in a polynomial ring can be read off from the locations of the zeros in their corresponding Betti table, for example the regularity, projective dimension, etc. We consider two problems on Betti tables of monomial ideals generated in degree 2 (edge ideals, after polarization): 1. Strand connectivity: can rows in the Betti table have internal zeros? [Conca, Weildon] 2. Subadditivity: for ti the maximal j for which "i,j is nonzero, must ta+b <= ta + tb? [Herzog-Srinivasan, Avramov-Conca-Iyengar] We show that for the first question the answer is NO for the first 2 rows and YES otherwise. We use it in showing that for the second question the answer is YES for b = 1, 2, 3 (for b = 1 this was proved by Herzog-Srinivasan, for all monomial ideals). Via Hochster formula, our proofs are topological-combinatorial.
Item Metadata
Title |
On vanishing patterns in Betti tables of edge ideals
|
Creator | |
Publisher |
Banff International Research Station for Mathematical Innovation and Discovery
|
Date Issued |
2016-03-14T10:34
|
Description |
Many important invariants of ideals in a polynomial ring can be read off from the locations of the zeros in
their corresponding Betti table, for example the regularity, projective dimension, etc. We consider two problems on Betti
tables of monomial ideals generated in degree 2 (edge ideals, after polarization): 1. Strand connectivity: can rows in the
Betti table have internal zeros? [Conca, Weildon] 2. Subadditivity: for ti the maximal j for which "i,j is nonzero, must
ta+b <= ta + tb? [Herzog-Srinivasan, Avramov-Conca-Iyengar]
We show that for the first question the answer is NO for the first 2 rows and YES otherwise. We use it in showing that for
the second question the answer is YES for b = 1, 2, 3 (for b = 1 this was proved by Herzog-Srinivasan, for all monomial
ideals). Via Hochster formula, our proofs are topological-combinatorial.
|
Extent |
34 minutes
|
Subject | |
Type | |
File Format |
video/mp4
|
Language |
eng
|
Notes |
Author affiliation: The Hebrew University of Jerusalem
|
Series | |
Date Available |
2016-09-13
|
Provider |
Vancouver : University of British Columbia Library
|
Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
|
DOI |
10.14288/1.0314223
|
URI | |
Affiliation | |
Peer Review Status |
Unreviewed
|
Scholarly Level |
Faculty
|
Rights URI | |
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International