Rodman and Shalom present in Linear Algebra Appl. 168:221-249 (1992) t
wo completion conjectures for partial upper triangular matrices. In th
is paper we show that one of them is not true in general, and we prove
its validity for some particular cases. We also prove the equivalence
between the two conjectures in the case of partial Hessenberg matrice
s. (C) Elsevier Science Inc., 1997.