Is multivariate calculus based on unary calculus?
No. Calculus is mainly divided into two categories: constant calculus, unitary calculus, multivariate calculus and partial derivative. One-dimensional differential product cannot be used as the basis to change multivariate calculus, which is not based on one-dimensional calculus. Calculus is a branch of mathematics, which studies the differential and integral of functions and related concepts and applications. It is the basic subject of mathematics.