Geodesic
On a cosine of the angle between the ``past" and the ``future" of the process
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1988), pp. 3-7

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The multidimensional stationary sequence of rang 1 is considered. The necessary and sufficient conditions are proposed to provide the cosine of the angle between the "past and the "future" to be less than 1. 
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     author = {N. Kh. Mesropian},
     title = {On a cosine of the angle between the ``past" and the ``future" of the process},
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N. Kh. Mesropian. On a cosine of the angle between the ``past" and the ``future" of the process. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1988), pp. 3-7. http://geodesic.mathdoc.fr/item/UZERU_1988_2_a0/