Evolutions, symbolic squares, and Fitting ideals.
Exact sequences of pairs in commutative rings
Exchange PF-rings and almost PP-rings.
Exchange PF-rings and almost PP-rings
Extensionless modules over tame hereditary algebras
Extensions of radical operations to fractional ideals.
Extremal functions of the Nevanlinna-Pick problem and Douglas algebras
The Nevanlinna-Pick problem at the zeros of a Blaschke product B having a solution of norm smaller than one is studied. All its extremal solutions are invertible in the Douglas algebra D generated by B. If B is a finite product of sparse Blaschke products (Newman Blaschke products, Frostman Blaschke products) then so are all the extremal solutions. For a Blaschke product B a formula is given for the number C(B) such that if the NP-problem has a solution of norm smaller than C(B) then all its extremal...