Translation of "Demonstrating" in French

Some people are demonstrating against nuclear arms.

Des gens sont en train de protester contre les armes nucléaires.

But my aunt was demonstrating a basic minimalist principle:

Mais ma tante était la preuve d'un principe de base du minimaliste :

demonstrating that for those women that do aspire to that sort of career,

ce qui montre aux femmes qui visent ce genre de carrières,