Abstract
In this paper, we give a new simple algebraic proof of the involutivity of the characteristic variety after Gabber, which is one of the most important results of D-module theory.
2010 Mathematics Subject Classification:
ACKNOWLEDGMENT
The authors sincerely thank the referee for very useful comments and suggestions to improve the paper. The authors also thank V. Ginzburg, University of Chicago for his valuable comments concerning Remark 5.2 in this paper. Authors also thank Raja Sridharan (TIFR, Mumbai) and D. S. Nagraj (IMSC, Chennai) for useful discussion.
Notes
Communicated by U. Walther.