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.
Decompositions and models for Hilbert-space operators have been very active research topics in operator theory over the past three decades. Yet the invariant subspace quest has certainly not been a failure at all, even though far from being settled.
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.