2 problems

Let $m\geqslant 2$, let $x\in\mathbb{K}$, and let $y=(y^1,\dots,y^m)\in\mathbb{K}^m$. Consider a linear system of $m$ second-order differential equations … where the coefficient fu…

Let … , its generalized symmetries are exhausted, up to equivalence of generalized symmetries, by its Lie symmetries. This would show that the Lie-symmetry analysis captures all ge…