  This note aims to highlight the link between representable functionals and
derivations on a Banach quasi *-algebra, i.e. a mathematical structure that can
be seen as the completion of a normed *-algebra in the case the multiplication
is only separately continuous. Representable functionals and derivations have
been investigated in previous papers for their importance concerning the study
of the structure properties of a Banach quasi *-algebra and applications to
quantum models.
