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 
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/
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     title = {On a cosine of the angle between the {\textquotedblleft}past" and the {\textquotedblleft}future" of the process},
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Voir la notice de l'article provenant de la source Math-Net.Ru

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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