Gottfried Leibniz (1646-1716) was a student of Erhard Weigel (1625-1699) and learned of the conatus principle from him and from Hobbes, though Weigel used the word tendentia (Latin: tendency) [REF].
Leibniz also uses his concept of a conatus in developing the principles of the integral calculus, adapting the meaning of the term, in this case, to signify a mathematical analog of Newton's accelerative "force".