Lezioni di algebra complementare dettate nella R. Universit ︢di Bologna, e redatte per uso degli studenti.

Earlier editions have title: Algebra complementare.

Four lectures on mathematics, delivered at Columbia University in 1911,

I. The defintion of solutions of linear partial differnetial equations by boundary conditions.--II. Contemporary researches in differential equations, integral equations, and integro-differential equations.--III. Analysis situs in connection with correspondences and differential equations.--IV. Elementary solutions of partial differential equations and Green's functions.