William Rowan Hamilton
Irish mathematician and astronomer (1805-1865)
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Updated 2026-05-29
Irish mathematician who cracked quaternions and rewrote the rulebook for classical mechanics. Hamilton's equations underpin modern theoretical physics, making him the rare 19th-century scholar still pulling weight in labs today.
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Sir William Rowan Hamilton 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.
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