Barrow, Isaac (1630-1677)

British mathematician, theologian, and classicist. His Lectiones geometricae 1670 contains the essence of the theory of calculus, which was later expanded by Isaac Newton and Gottfried Leibniz.
Barrow was born in London and studied at Cambridge, where he was professor of mathematics 1663-69. Isaac Newton attended his lectures and was inspired by Barrow's work in the field of optics. To Barrow is due the credit for two original contributions: the method of finding the point of refraction at a plane interface, and his point construction of the diacaustic of a spherical interface.
Barrow's mathematical importance is slight, the Lectiones Mathematicae 1669 being marred by his insistence that algebra be separated from geometry and his desire to relegate algebra to a subsidiary branch of logic.