Infinitely Many Commuting Nonlocal Symmetries for Modified Martinez Alonso-Shabat Equation

Abstract

We present a recursion operator and an infinite hierarchy of nonlocal commuting symmetries for the modified Martinez Alonso-Shabat equation $u_y{u}_{xz}+\alpha u_x{u}_{ty}-(u_z+\alpha u_t)u_{xy}=0$.