When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
By Boris Hasselblatt. Foreword; 1. Local rigidity of group actions: past, present, future David Fisher; 3. Causes of stretching of Birkhoff sums and mixing in flows on surfaces Andrey Kochergin; 6.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.