Arthur Cayley (16 August 1821 – 26 January 1895) is one of the principal and most prolific mathematicians of 19-th century, especially in algebra. He also worked on questions in algebraic geometry, graph theory, …
Introducing the octonions:
Cayley’s 1848 paper on elimination theory contains probably the first serious application of homological algebra, including Koszul complexes. It is reproduced and commented in the book
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