Isaac Newton on Mathematical Certainty and Method
Niccolò Guicciardini is Professor of the History of Science at the University of Bergamo, Italy. He is the author of The Development of Newtonian Calculus in Britain, 1700-1800 and Reading the Principia: The Debate on Newton's Mathematical Methods for Natural Philosophy from 1687 to 1736. He is the recipient of the Sarton Medal for 2011-12 awarded by the University of Ghent, Belgium.
2: Newton on Certainty in Optical Lectures