Geodesic
A Norm Inequality for Linear Transformations
Canadian mathematical bulletin, Tome 4 (1961) no. 3, pp. 239-242

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In 1949 Ky Fan [1] proved the following result: Let λ1...λn be the eigenvalues of an Hermitian operator H on an n-dimensional vector space Vn. If x1, ..., xq is an orthonormal set in V1, and q is a positive integer such n that 1 ≤ q ≤ n, then 1 
Moyls, B.N.; Khan, N.A. A Norm Inequality for Linear Transformations. Canadian mathematical bulletin, Tome 4 (1961) no. 3, pp. 239-242. doi: 10.4153/CMB-1961-026-9
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     title = {A {Norm} {Inequality} for {Linear} {Transformations}},
     journal = {Canadian mathematical bulletin},
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     year = {1961},
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     doi = {10.4153/CMB-1961-026-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-026-9/}
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