Paper, 'Vera circuli et hyperbolae quadratura in propria sua proportionis specie inventa et demonstrata [The true way to make the circle and hyperbola square according to their proper proportion, discovered and demonstrated]' by James Gregory Gregory writes about the computation of the area of the circle and its relation to the computation of supplemental spaces between the hyperbola and its asymptote. He discusses the work of other mathematicians including John Wallis, [Ludolph] van Ceulen, Gregorie of St Vincent [Grégoire de Saint-Vincent], and Nicholas [Nicolas] Mercator. Subject: Mathematics c. 17th century