ABSTRACT
We all know that there are simple quadratic equations, such as x 2 +1 = 0, that have no real solutions. In order to provide a notation with which to discuss such equations, we introduce a symbol i, and define i 2 = − 1. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315382517/471f85d9-9517-49b3-9a80-cddf80ac5607/content/eq211.tif"/>
