Two copies. Calculus, edited by Zhang and Chen Zhong (one of the "Thirteenth Five-Year Plan" textbooks of independent college mathematics series), is the textbook of calculus (or advanced mathematics) for science and engineering majors in independent colleges. There are two volumes in the book, in which Calculus (1) contains four chapters: limit and continuity, derivative and differential, indefinite integral and definite integral, and spatial analytic geometry, and Calculus (2) contains five chapters: differential calculus of multivariate functions, double integral and triple integral, curve integral and surface integral, polynomial series and power series, and differential equation. So there are two books on college calculus. Calculus, a mathematical concept, is a branch of higher mathematics that studies the differential and integral of functions and related concepts and applications.