Andrew Russell Forsyth

“ Cayley contributed to nearly every subject in the range of pure mathematics, and some of its branches owe their origin to him. Conspicuously among these may be cited the theory of invariants and covariants; the general establishment of hypergeometry on broad foundations, and specially the introduction of 'the absolute' into the discussion of metrical properties; the profound development of branches of algebra, which first were explained in a memoir on matrices; contributions to the theory of groups of operations; and advances in the theory of the solution of the quintic equation. ”

“ Not less important were his contributions to the theory of analytical geometry, alike in regard to curves and to surfaces. There is hardly an important question in the whole range of either subject in the solution of which he has not had some share. Nor is it to the various theories in pure mathematics alone that he contributed. ”

“ In addition to membership of all the leading scientific societies of his own country, he was an honorary foreign member of the French Institute and of the academies of Berlin, Gottingen, St. Petersburg, Milan, Rome, Leyden, Upsala, and Hungary ”