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William Rowan Hamilton ○̉｜Definition｜1st｜20260506164137-00-⌔
William Rowan Hamilton - Wikipedia
William Rowan Hamilton
Sir William Rowan Hamilton (4 August 1805 – 2 September 1865)12 was an Irish mathematician, physicist, and astronomer who made numerous major contributions to algebra, classical mechanics, and optics. His theoretical works and mathematical equations are considered fundamental to modern theoretical physics, particularly his reformulation of Lagrangian mechanics. His research included the analysis of geometrical optics, Fourier analysis, and quaternions, the last of which made him one of the founders of modern linear algebra.3
Hamilton was Andrews Professor of Astronomy at Trinity College Dublin. He was also the third director of Dunsink Observatory from 1827 to 1865. The Hamilton Institute at Maynooth University is named after him.
He received the Cunningham Medal twice, in 1834 and 1848, and the Royal Medal in 1835. He was also knighted in 1835. Hamilton remains arguably the most influential Irish physicist, along with Ernest Walton. Since his death, he has been commemorated throughout the country, with several institutions, streets, monuments, and stamps bearing his name.
Printed 2026-06-28.
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Link to original Footnotes
Hamilton was born at midnight. In his younger years, his birthday was celebrated on 3 August, but after the birth of his second son on 4 August 1835, he changed it to 4 August. ↩
Graves (1882) Vol. I, p. 1 ↩
Lewis, Albert (2004). “Hamilton, William Rowan (1805–1865)”. Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/12148. (Subscription, Wikipedia Library access or UK public library membership required.) ↩
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