Letter from William Kingdon Clifford to Camilla Croudace [manuscript], ca. 1865.

Croudace, Camilla Mary Julia, 1844-1926

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Clifford, William Kingdon, 1845-1879

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William Kingdon Clifford FRS (4 May 1845 – 3 March 1879) was an English mathematician and philosopher. Building on the work of Hermann Grassmann, he introduced what is now termed geometric algebra, a special case of the Clifford algebra named in his honour. The operations of geometric algebra have the effect of mirroring, rotating, translating, and mapping the geometric objects that are being modelled to new positions. Clifford algebras in general and geometric algebra in particular have been of...