<正>Rank-One Cross Commutators on Backward Shift Invariant Subspaces on the Bidisk Kei Ji IZUCHI Kou Hei IZUCHI Abstract For a backward shift invariant subspace N in H~2(Γ~2),the operators S_z and S_w on N are defined by S_z=P_NT_(z|N) and S_w=P_NT_(w|N),where P_N is the orthogonal projection from L~2(Γ~2) onto N.We give a characterization of N satisfying rank[S_z,S_w~*]=1.
<正>Local Embeddings of Some Families of Subgroups of Finite Groups A.BALLESTER-BOLINCHES Luis M.EZQUERRO Alexander N.SKIBA Abstract In this paper we study the influence of the partial cover and avoidance property on the subgroups of some relevant families of subgroups in a finite group.