Geodesic
External properness
Kybernetika, Tome 44 (2008) no. 3, pp. 360-372.

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In this paper, we revisit the structural concept of properness. We distinguish between the properness of the whole system, here called internal properness, and the properness of the “observable part” of the system. We give geometric characterizations for this last properness concept, namely external properness.
Classification : 93B27, 93C05, 93C35
Keywords: properness; linear systems; implicit systems 
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     title = {External properness},
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     zbl = {1154.93329},
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Bonilla, Moisés; Malabre, Michel; Pacheco, Jaime. External properness. Kybernetika, Tome 44 (2008) no. 3, pp. 360-372. http://geodesic.mathdoc.fr/item/KYB_2008__44_3_a6/