  In this paper we present two different results in the context of nonlinear
analysis. The first one is essentially a nonlinear technique that, in view of
its strong generality, may be useful in different practical problems. The
second result, more technical, but also connected to the first one, is an
extension of the well-known Pietsch Domination Theorem. The last decade
witnessed the birth of different families of Pietsch Domination-type results
and some attempts of unification. Our result, that we call "full general
Pietsch Domination Theorem" is potentially a definitive Pietsch Domination
Theorem which unifies the previous versions and delimits what can be proved in
this line.The connections to the recent notion of weighted summability are
traced.
