Geodesic
Object visibility for a group of observers with inaccurately given coordinates
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 15 (2009) no. 4, pp. 44-51
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A function is introduced that characterizes the relative visibility of a moving object for an observer with inaccurately given coordinates. The directional differentiability of this function is established and, for the case of a moving observer, a differentiation formula is given. The visibility characteristic of an object for a group of observers is defined and the problem of minimizing this characteristic is considered.
Keywords: visibility characterization of a moving object, directional differentiability. 
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V. I. Berdyshev. Object visibility for a group of observers with inaccurately given coordinates. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 15 (2009) no. 4, pp. 44-51. http://geodesic.mathdoc.fr/item/TIMM_2009_15_4_a4/

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[2] Berdyshev V. I., “Vidimost ob'ekta dlya nablyudatelya s netochno zadannymi koordinatami”, Tr. In-ta matematiki i mekhaniki UrO RAN, 15, no. 3, 2009, 21–28

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