Died: 17 March 1956 in Cambridge, Cambridgeshire, England

Henry Baker's parents were Sarah Ann Britham and Henry Baker. His father, also called Henry, was a domestic butler. He attended a number of small schools in Cambridge before being educated at Perse School in Cambridge. He won a sizarship to St John's College in the summer of 1883 but remained at Perse School to prepare for the Cambridge Scholarship examinations, which he sat in December 1883.

In the examinations he won a scholarship to St John's College, Cambridge, matriculating in October 1884. In 1887 he was Senior Wrangler in the Mathematical Tripos. In fact he was first equal, being bracketed in top place with two other students. He was elected a Fellow of St John's College in 1889 and, in the same year, won the first Smith's prize.

Baker would remain at Cambridge for the whole of his career, strongly influencing the teaching of pure mathematics in that university and in the rest of Great Britain. From 1890 to 1895 he was a College Lecturer, being influenced by Cayley during this period, then he became a University Lecturer until 1914. From 1903 to 1914 he also held the Cayley Lectureship in Mathematics, then from 1914 until he retired in 1936 he was Lowndean Professor of Astronomy and Geometry. He justified the 'astronomy' title in his chair by lecturing on periodic orbits and other astronomical topics but he continued to undertake research exclusively in pure mathematics.

Baker, while on a visit to Göttingen, was inspired by Klein to study algebraic function theory. He wrote the important Abel's Theorem and the Allied Theory of Theta Functions in 1897 and another major contribution Multiply Periodic Functions in 1907. The first of these was reprinted by Cambridge University Press in 1995.

He also came in contact with the Italian School of geometry and made their work the subject of his 1911 London Mathematical Society presidential address. From 1911 he studied birational geometry publishing his most important contribution, a six volume masterpiece Principles of Geometry from 1922 to 1925. The first two volumes cover the foundations of Euclidean geometry and the introduction of a coordinate system, volume 3 studies solid geometry considering quadrics, cubic curves in space, and cubic surfaces. Volume 4 considers higher dimensions, mainly dimensions four and five, while the final two volumes cover the analytical principles of the theory of curves and the theory of algebraic surfaces and higher loci.

In 1943 Baker published An Introduction to Plane Geometry which was reprinted in 1971. Its contents are as follows: Euclid's theory of parallel lines; Propositions of incidence; The symbolic representation and Pappus' theorem; Theorems proved from the propositions of incidence; The fundamental hypothesis; The symbols of the real points of a line; Involution and harmonic ranges; Related ranges and pencils; Conics; Assignment of two absolute points, properties of circles; The parabola; The rectangular hyperbola; Theorems on conics; Length and distance; Equation of conic and line.

Baker also undertook the extremely large task of editing Sylvester's papers. The four volumes of the Collected Mathematical Papers of James Joseph Sylvester were edited and published by Baker between 1904 and 1912, and with these volumes he produced a fitting tribute to the great mathematician.

Elected to a Fellowship of the Royal Society in 1898, it was indeed highly appropriate that Baker won the Society's Sylvester Medal in 1910. He was secretary of the Cambridge Philosophical Society in 1897 and he won the De Morgan Medal of the London Mathematical Society in 1905, being president of the Society in 1910-11. He was elected President of Section A of the British Association meeting held in Birmingham in 1913. His address to the Association provided an opportunity for Baker to explain his feelings about the relation of pure mathematics to other sciences. He said [1]:-

The mathematician is as sensitive as others to the marvel of each recurring springtime. ... Pure mathematics is an art, a creative art. ... Pure mathematics is not the rival, even less is it the handmaid, of other branches of science. Properly pursued it is the essence and soul of them all.

Baker inspired a younger generation of geometers. He founded the Saturday afternoon seminar or 'tea party' which became the focus of activity in geometry. His personality is described in [3]:-

Articles:

1. W V D Hodge, Henry Frederick Baker, Biographical Memoirs of Fellows of the Royal Society of London 2 (1956).
2. W V D Hodge, Henry Frederick Baker, Dictionary of National Biography Supp (1951-60) (London, 1971), 54-56.

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