Geodesic
About disconjugate solutions of the difference system
Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2008), pp. 7-8 Cet article a éte moissonné depuis la source Math-Net.Ru

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The variant of generalizing the concept of disconjugate solutions of scalar difference equations is shown by the example of the system of the second order. The disconjugacy criterion based on test functions is given. 
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A. A. Aizikovich. About disconjugate solutions of the difference system. Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2008), pp. 7-8. http://geodesic.mathdoc.fr/item/VUU_2008_2_a1/

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[2] Aizikovich A. A., “Kriterii neostsillyatsii reshenii raznostnogo uravneniya”, Differents. uravneniya, 17:12 (1981), 2201–2211 | MR