Geodesic
Systems of matrix differential equations for surfaces
Contemporary Mathematics. Fundamental Directions, Science — Technology — Education — Mathematics — Medicine, Tome 68 (2022) no. 1, pp. 70-79

Voir la notice de l'article provenant de la source Math-Net.Ru

Necessary and sufficient conditions for the equivalence of surfaces under the action of a special pseudo-orthogonal group are established. 
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K. K. Muminov; R. A. Gafforov. Systems of matrix differential equations for surfaces. Contemporary Mathematics. Fundamental Directions, Science — Technology — Education — Mathematics — Medicine, Tome 68 (2022) no. 1, pp. 70-79. http://geodesic.mathdoc.fr/item/CMFD_2022_68_1_a5/