The Jesuit school of the XVIII century
This chapter is devoted to the principle of action by Vincenzo Riccati and Vincenzo Angiulli, whose VWL is similar to that of Bernoulli. In the first part the contribution of Angiulli and his demonstration of VWL is presented in the foundational route. This is perhaps the first convincing demonstration of a VWL. In the second part the contribution of Vincenzo Riccati is presented.