Geodesic
On generalization of decomposability
Glasgow mathematical journal, Tome 22 (1981) no. 1, pp. 77-81

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Let X be a complex Banach space and let T be a bounded linear operator on X. Then T is decomposable if for every finite open cover of σ(T) there are invariant subspaces Yi(i= 1, 2, ..., n) such that(An invariant subspace Y is spectral maximal [for T] if it contains every invariant subspace Z for which σ(T|Z) ⊂ σ(T|Y).). 
Lange, Ridgley. On generalization of decomposability. Glasgow mathematical journal, Tome 22 (1981) no. 1, pp. 77-81. doi: 10.1017/S0017089500004493
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