Abstract
We compute the L-characteristic cycle of an A-hypergeometric system and higher Euler–Koszul homology modules of the toric ring. We also prove upper semicontinuity results about the multiplicities in these cycles and apply our results to analyze the behavior of Gevrey solution spaces of the system.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 323-347 |
| Number of pages | 25 |
| Journal | Algebra and Number Theory |
| Volume | 14 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2020 |
Bibliographical note
Publisher Copyright:© 2020, Mathematical Sciences Publishers. All rights reserved.
Keywords
- A-hypergeometric system
- Characteristic cycle
- D-module
- Gevrey series
- Irregularity sheaf
- Toric ring