Geodesic
Externally and Internally Positive Time-Varying Linear Systems
International Journal of Applied Mathematics and Computer Science, Tome 11 (2001) no. 4, pp. 957-964.

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The notions of externally and internally positive time-varying linear systems are introduced. Necessary and sufficient conditions for the external and internal positivities of time-varying linear systems are established. Moreover, sufficient conditions for the reachability of internally positive time-varying linear systems are presented.
Mots-clés : elektronika, system liniowy 
@article{IJAMCS_2001_11_4_a9,
     author = {Kaczorek, T.},
     title = {Externally and {Internally} {Positive} {Time-Varying} {Linear} {Systems}},
     journal = {International Journal of Applied Mathematics and Computer Science},
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     year = {2001},
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     url = {http://geodesic.mathdoc.fr/item/IJAMCS_2001_11_4_a9/}
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Kaczorek, T. Externally and Internally Positive Time-Varying Linear Systems. International Journal of Applied Mathematics and Computer Science, Tome 11 (2001) no. 4, pp. 957-964. http://geodesic.mathdoc.fr/item/IJAMCS_2001_11_4_a9/