## Introduction

Generally, numbers are very abstract entities. There is, e.g., nothing concrete which you could point to and say that *is* the number three. There are always either three people, three cows, three cars … Accordingly, there are various concrete representations for the number three, e.g., 3 or III.

Based on our ideas about real numbers, we will first consider *one* geometric representation of the real numbers and construct the known arithmetic operations geometrically. These representation and constructions we can “easily” expand to represent a new set of numbers—the *complex numbers*.

Continue reading “Complex Numbers, Part 1—A geometric primer”