# Calculus with Julia

# Preface

This is a set of notes for learning calculus using the `Julia`

language. `Julia`

is an open-source programming language with an easy to learn syntax that is well suited for this task.

Read “Getting started with Julia” to learn how to install and customize `Julia`

for following along with these notes. Read “Julia interfaces to review different ways to interact with a `Julia`

installation.

Since the mid 90s there has been a push to teach calculus using many different points of view. The Harvard style rule of four says that as much as possible the conversation should include a graphical, numerical, algebraic, and verbal component. These notes use the programming language Julia to illustrate the graphical, numerical, and, at times, the algebraic aspects of calculus.

There are many examples of integrating a computer algebra system (such as `Mathematica`

, `Maple`

, or `Sage`

) into the calculus conversation. Computer algebra systems can be magical. The popular WolframAlpha website calls the full power of `Mathematica`

while allowing an informal syntax that is flexible enough to be used as a backend for Apple’s Siri feature. (“Siri what is the graph of x squared minus 4?”) For learning purposes, computer algebra systems model very well the algebraic/symbolic treatment of the material while providing means to illustrate the numeric aspects. These notes are a bit different in that `Julia`

is primarily used for the numeric style of computing and the algebraic/symbolic treatment is added on. Doing the symbolic treatment by hand can be very beneficial while learning, and computer algebra systems make those exercises seem kind of redundant, as the finished product can be produced much easier.

Our real goal is to get at the concepts using technology as much as possible without getting bogged down in the mechanics of the computer language. We feel `Julia`

has a very natural syntax that makes the initial start up not so much more difficult than using a calculator, but with a language that has a tremendous upside. The notes restrict themselves to a reduced set of computational concepts. This set is sufficient for working many of the problems in calculus, but do not cover thoroughly many aspects of programming. (Those who are interested can go off on their own and `Julia`

provides a rich opportunity to do so.) Within this restricted set, are operators that make many of the computations of calculus reduce to a function call of the form `action(function, arguments...)`

. With a small collection of actions that can be composed, many of the problems associated with introductory calculus can be attacked.

These notes are presented in pages covering a fairly focused concept, in a spirit similar to a section of a book. Just like a book, there are try-it-yourself questions at the end of each page. All have a limited number of self-graded answers. These notes borrow ideas from many sources, for example Strang (n.d.), Knill (n.d.), Schey (1997), Hass, Heil, and Weir (2018), Rogawski, Adams, and Franzosa (2019), several Wikipedia pages, among others.

These notes are accompanied by a `Julia`

package `CalculusWithJulia`

that provides some simple functions to streamline some common tasks and loads some useful packages that will be used repeatedly.

These notes are presented as a Quarto book. To learn more about Quarto books visit https://quarto.org/docs/books.

These notes may be compiled into a `pdf`

file through Quarto. As the result is rather large, we do not provide that file for download. For the interested reader, downloading the repository, instantiating the environment, and running `quarto`

to render to `pdf`

in the `quarto`

subdirectory should produce that file (after some time).

To *contribute* – say by suggesting addition topics, correcting a mistake, or fixing a typo – click the “Edit this page” link and join the list of contributors. Thanks to all contributors and a *very* special thanks to `@fangliu-tju`

for their careful and most-appreciated proofreading.

Calculus with Julia version 0.18, produced on November 1, 2023.