The logarithmic spiral was investigated by the mathematician who was a proponent of which branch of mathematics?
Logarithmic spiral:  The logarithmic spiral was first described by Descartes and later extensively investigated by Jacob Bernoulli, who called it "Spira mirabilis", "the marvelous spiral". Jacob Bernoulli: Jacob Bernoulli (also known as James or Jacques; 6 January 1655 [O.S. 27 December 1654] – 16 August 1705) was one of the many prominent mathematicians in the Bernoulli family. Jacob Bernoulli:  He was an early proponent of Leibnizian calculus and had sided with Leibniz during the Leibniz–Newton calculus controversy.
Leibnizian calculus