In which paper, did Jordan introduce/prove the Jordan canonical form?
1 Answer
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See Hawkins (1977, §5): 2 $\times$ 2 case in (1868, pp. 111–113), n $\times$ n in Traité des substitutions et des équations algébriques (1870, pp. 114–126). Also Cours d’analyse, vol. 3 (1887, pp. 173–175).