IN this book the author establishes the principles of quaternions by the use of the six operations—addition, subtraction, multiplication, division, reversion, and mean reversion. By the ...

SINCE the publication of Hamilton's “Elements of Quaternions,” in which the great mathematician developed his new calculus with admirable skill and clearness, more than thirty years have ...

Przemysław Koprowski, Sums of Squares of Pure Quaternions, Mathematical Proceedings of the Royal Irish Academy, Vol. 98A, No. 1 (Sep., 1998), pp. 63-65 ...