Geodesic
On the invertibility of almost periodic operators
Sbornik. Mathematics, Tome 67 (1990) no. 2, pp. 367-377

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A number of results of the following type are established: {\it If $T$ is an operator with almost periodic coefficients such that $$ \inf\{\|Tx\|:\|x\|=1\}>0, $$ then $T$ is invertible}. Bibliography: 26 titles. 
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     author = {V. G. Kurbatov},
     title = {On the invertibility of almost periodic operators},
     journal = {Sbornik. Mathematics},
     pages = {367--377},
     publisher = {mathdoc},
     volume = {67},
     number = {2},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1990_67_2_a2/}
}
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V. G. Kurbatov. On the invertibility of almost periodic operators. Sbornik. Mathematics, Tome 67 (1990) no. 2, pp. 367-377. http://geodesic.mathdoc.fr/item/SM_1990_67_2_a2/