## quaternions

Noun

- plural form of
*quaternion*

- Rowan Hamilton, in the preface to his Lectures on
**Quaternions**, refers more than once to those papers as having led and encouraged him in the working out of the new system of**quaternions**. - He retained his wonderful faculties unimpaired to the very last, and steadily continued till within a day or two of his death, which occurred on the 2nd of September 1865, the task (his Elements of
**Quaternions**) which had occupied the last six years of his life. - The other great contribution made by Hamilton to mathematical science, the invention of
**Quaternions**, is treated under that heading. - His first great work, Lectures on
**Quaternions**(Dublin, 1852), is almost painful to read in consequence of the frequent use of italics and capitals. - He was much interested, too, in universal algebra, non-Euclidean geometry and elliptic functions, his papers "Preliminary Sketch of Bi-
**quaternions**" (1873) and "On the Canonical Form and Dissection of a Riemann's Surface" (1877) ranking as classics.

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