IntroductionWhen I was fifteen years old as a high school student in Zambia, I took a course called Additional Mathematics. It was then that I consciously came across the presently understood and accepted expression that division by zero is undefined.However, I was still technically and analytically inferior in my mathematical experience to make any investigations on the issue. It was from then that my mind became alert and began to question as to why a situation in mathematics could be un-defined since mathematics in essence, is the very science that deals with definitions as the basic and necessary forms of operational premises.So, in all forms of intellectual justification, I found that statement or expression to be some-what out of place in context in that, as mathe-matics, by nature depends on definitions, therefore, to have a mathe-matical situation which is undefinable, becomes illogical, hysterical or magical, as everybody has a problem with the number zero.From that day forward I set out to work, to understand the number systems, and the very nature of a binary operation like division. I thence finally.after many metal mathematical, multimental, monumenttal, challenges, struggles.and a few successes, I come up with the ideas contained and demonstrated in these works entitled Zeropsis.Zeropsis is the study and analysis of the number zero. It comprises three parts, Zeropsis I, II, and III. Here is Zeropsis I, in which I will address, in particular, three keystone issues that will then introduce the reader to the understanding of the principles contained in the remaining two volumes.Zeropsis I discusses the history of the number zero, and attacks the known problems of how we presently understand the number and sagaciously salutes the solutions and cognitions discovered. Also as in demonstration of an application of these findings, it will be proved that the number zero is a prime number. Please enjoy yourself and enjoy the mental stimulations.Charles M. Namakando