Operational Systems, Book 0, Chapter 1, is the first course in the Elements of Mathematics Curriculum. We offer this course in our summer introductory program and in our in-school pilot in the fall at McKinley Classical Leadership Academy in the St. Louis School District.

The course explores operational systems and their properties, beginning with finite modular sets and moving to infinite sets - natural numbers and whole numbers with various operations. This is our first step in developing the number system.