Grégoire de Saint-Vincent
Grégoire de Saint-Vincent (French: [ɡʁeɡwaʁ də sɛ̃ vɛ̃sɑ̃]; Latin: Gregorius a Sancto Vincentio, Dutch: Gregorius van St-Vincent; 8 September 1584 Bruges – 5 June 1667 Ghent) was a Flemish Jesuit and mathematician. He is remembered for his work on quadrature of the hyperbola. He is also known as Gregorio a San Vincente.
Grégoire gave the "clearest early account of the summation of geometric series." He also resolved Zeno's paradox by showing that the time intervals involved formed a geometric progression and thus had a finite sum.