Paper, 'Solutio problematis florentum' [Of the solution to the Florentine problem] by David Gregory in his letter to Edmond Halley David Gregory's solution to the 'Florentine' problem set by Vincenzo Viviani, a disciple of Galileo Galilei, in the Acta Eruditorum (1692). The task was to create four equal-sized windows from a spherical dome in such a way that the remainder of the sphere would be quadrable. Includes diagram in text. Subject: Geometry Published in Philosophical Transactions as 'Solutio problematis Florentini de testitudine veliformi quadrabili, a Davide Gregorio, M. D. ac R. S. S. Communicata'. Communicated by Edmond Halley. Read to the Royal Society on 17 January 1694. 1693