  A C.R. note by Alano Ancona from 1980 is reexamined. Within his line of ideas
in the proof two new theorems are constructed. No claim of originality. These
are put into the context of later research. One far reaching conjecture is
given. The note by Ancona was written to fill the need of Brezis and Browder
who were writing a paper on higher order operators.
