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.
A condensing (or densifying) operator is a mapping under which the image of any set is in a certain sense more compact than the set itself. The linear condensing operators are characterized by the fact that almost all of their spectrum is included in a disc of radius smaller than one.
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.