摘要
H2（Δ） denotes the Hardy space on the unit circle Δ （cf.[1], [2] for definition）, T? the Toeplitz operator with the symbol （?）∈L∞（Δ） （cf. [1], [2]）, particularly, U the unilateral shift Tt and en （n≥0） the vector tn（n≥0） in H2（Δ）. Define now the mapping Γ of （?）（H2（Δ））, the algebra of all bounded linear operators on H2（Δ）, in itself as Γ（X）=U*XU X∈（?）（H2（Δ））. In their talk at the ninth symposium
