The Turn of Numbers: The Past and Present of the Imaginary Unit i

This article delves into the historical evolution and mathematical significance of the imaginary unit i. From a historical perspective, the author not only explains how imaginary numbers are represented on the complex plane through 90-degree rotation but also traces the origin and development of this concept. The article covers everything from mathematicians’ initial confusion with ‘impossible numbers’ to the important applications of imaginary numbers in modern science and engineering. For readers looking to understand fundamental mathematical concepts, this article offers content that is both in-depth and accessible, demonstrating how seemingly abstract mathematical concepts have become a cornerstone of modern technology.