Geodesic
Spectral continuity for operator matrices
Glasgow mathematical journal, Tome 43 (2001) no. 3, pp. 487-490

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In this paper we prove that if M_C=\pmatrix {A&#TAB;C\cr0&#TAB;B} is a 2\times 2 upper triangular operator matrix on the Hilbert space H\bigoplus K and if \sigma (A)\cap \sigma (B)=\emptyset , then \sigma is continuous at A and B if and only if \sigma is continuous at M_C, for every C\in B(K,H{\hskip1}). 
Djordjević, Slavisă V.; Han, Young Min. Spectral continuity for operator matrices. Glasgow mathematical journal, Tome 43 (2001) no. 3, pp. 487-490. doi: 10.1017/S0017089501030105
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     title = {Spectral continuity for operator matrices},
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