Results: **2**

#### A Lax pair for the (1+3) **nonlinear** **equation**

Integral systems with four independent variables have special signifi-cance in mathematics and physics. The discovery of inverse scattering method played an important role in reconsidering the place of integrable systems of **nonlinear** **partial** **differential** **equations** in mathematical sciences. The search for a systematic approach to developing exact solutions of such systems has become one of the main problems in the theory of integrable systems.
1. Fokas A. S. Symmetries and integrability // Stud. Appl....

#### On the relations between the integrable hierarchies

... **Equation** // Journal of Mathematical Physics. 2002. Vol. 43, № 2. P. 1095–1105.
14. Yurov V. A., Yurov A. V. The Cauchy problem for the generalized hyperbolic Novikov-Veselov **equation**. arXiv:1509.06078 [nlin.SI].
Yurov A., Yurova A.
Lax pair, **nonlinear** **partial** **differential** **equation**, exact solution, integrable **equation**
48-53