# quaternions

Noun

- plural form of
*quaternion*

- His earliest work dealt mainly with mathematical subjects, and especially with
**quaternions**(q.v.), of which he may be regarded as the leading exponent after their originator, Hamilton. - He was the author of two text-books on them - one an Elementary Treatise on
**Quaternions**(1867), written with the advice of Hamilton, though not published till after his death, and the other an Introduction to**Quaternions**(1873), in which he was aided by Professor Philip Kelland (1808-1879), who had been one of his teachers at Edinburgh. - In addition,
**quaternions**was one of the themes of his address as president of the mathematical section of the British Association in 1871. - Among his articles may be mentioned those which he wrote for the ninth edition of this Encyclopaedia on Light, Mechanics,
**Quaternions**, Radiation and Thermodynamics, besides the biographical notices of Hamilton and Clerk Maxwell. - For the subjects of this general heading see the articles ALGEBRA, UNIVERSAL; GROUPS, THEORY OF; INFINITESIMAL CALCULUS; NUMBER;
**QUATERNIONS**; VECTOR ANALYSIS.

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