Geodesic
On the dynamical algorithm of finding derivative function according to piece-constant approximate information about it
Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 36 (2006) no. 2, pp. 31-34.

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The stable algorithm of numerical differentiation approximately assigned function not used difference quotient is proposed. 
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A. Yu. Vdovin; S. S. Rubleva. On the dynamical algorithm of finding derivative function according to piece-constant approximate information about it. Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 36 (2006) no. 2, pp. 31-34. http://geodesic.mathdoc.fr/item/IIMI_2006_36_2_a6/

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[2] Kryazhimskii A. V., Osipov Yu. S., “O modelirovanii upravleniya v dinamicheskoi sisteme”, Izv. AN SSSR. Tekhn. kibernetika, 1983, no. 20, 51–60 | MR

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