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In this paper I will give a brief history of the discovery (Hamilton, 1843)of quaternions. I will address the issue of why a theory of triplets (theoriginal goal of Hamilton) could not be developed. Finally, I will discussbriefly the history of various attempts to define holomorphic functions onquaternionic variables.

A Brief History of Quaternions and of the Theory of Holomorphic Functions of Quaternionic Variables