"The first systematic attack on a problem involving a partial differential equation was carried out in a sequence of 1…"

"One morning early in my (Hersh's) years as a thesis student of Peter Lax, I entered my mentor's office to find him gl…"

"The development of the theory of P.D.E. is closely linked with advances in complex analysis; in fact, Riemann’s appro…"

"If the original work of Calderón and Zygmund was related to elliptic PDE's, later developments allowed applications o…"

"The process of reasoning called "Mathematical Induction" has had several independent origins. It has been traced back…"

"The method represents a best approximation algorithm of minimal length that, owing to several minimization properties…"

"This method is supreme above all praise; it is certainly the finest thing accomplished in number theory before Lagrange."

"Multiply the arc by the square of the arc, and take the result of repeating that [any number of times]. Divide [each …"

"This is as I have said in my Arithmetic:—The area of a circle is equal to the product of the circumference by one-fou…"

"A sphere is a solid figure described by the revolution of a semicircle about its diameter, which remains fixed.The ax…"