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Published online by Cambridge University Press: 15 September 2014
Nowhere, I think, does Hamilton, or any other author, attempt the very fundamental problem of finding the differential of qn where q is a quaternion and n any scalar. It was by noticing an oversight in Tait's Quaternions, § 182, where he considers d.q½, that I was led to a consideration of the subject.
[* See Note appended.—P. G. T.]