α(α≤卐_0)重单侧位移的超不变子空间

ON HYPERINVARIAN SUBSPACE OF UNILATERAL SHIFT OF MULTIPLICITY α(α≤卐_0)

本文给出了α(α≤ _0)重单侧位移的超不变子空间的刻划,推广了著名的 Beur-ling 定理。

This paper gives a characteristic description on hyperinvarian Su- bspace of unilateral shift of multiplicity α(α≤_0) The famous Beu- rling theorem is generalized。