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...ix [[wiktionary:eigen|'''eigen-''']] is adopted from the [[German language|German]] word ''eigen'' for "self".<ref>See [[wikt:eigen|''eigen'']] or [[wikt:eig ...ine|1972|loc=p. 1063}}</ref> He was the first to use the [[German language|German]] word ''eigen'' to denote eigenvalues and eigenvectors in 1904, though he