Evaluate what the purpose of the book should be, such as a history of mathematics or beginning calculus. Determine if the book is for education or for math enthusiasts.
Compile necessary research and information. Divide topics into chapters or sections for more accessibility. Draft a manuscript.
Select how you want the book to be published, once the manuscript is complete. Many universities publish textbooks; contact a university press and submit a query letter. Specific textbook publishing companies can be found in "Writer's Market" or on the Internet. A publishing company will take control of the design and look of your book.
Design the book cover and internal layout if you choose to self-publish (or hire a book designer to do so). It is important that the book looks clean and professional in order for readers and potential buyers to become interested.
Websites such as Lulu publish books at a low price. Books are sold on an order-by-order basis, so no overhead is required. Your book can also be accessed online.
If you are self-publishing and looking to make a profit, get a quote at a local printing company. It will be necessary to buy books up front, but selling them at a higher cost than you paid will ensure some revenue.
Market your book to schools or hobbyists, depending on the focus of the book. Contact local math departments and write a letter about your book. Present your books to classes or at local cafes and bookstores. Local newspapers are eager to feature local writers, and community involvement will ensure interest in your publication.