Infinitesimal calculus and Method of fluxions

Infinitesimal calculus noun - The branch of mathematics that is concerned with limits and with the differentiation and integration of functions.

Method of fluxions and infinitesimal calculus are semantically related. In some cases you can replace phrase "Method of fluxions" with "Infinitesimal calculus", this phrases are similar.

Method of fluxions noun - The part of calculus that deals with the variation of a function with respect to changes in the independent variable (or variables) by means of the concepts of derivative and differential.

Infinitesimal calculus and method of fluxions are semantically related. You can use "Infinitesimal calculus" instead a noun phrase "Method of fluxions".