<正> We present basic theory of variable separation for (1 + 1)-dimensional nonlinear evolution equations withmixed part......

<正> In this paper,the direct symmetry method is extended to the Lax pair of the ANNV equation.As a result,symmetries of......

<正> We exploit higher-order conditional symmetry to reduce initial-value problems for evolution equations toCauchy prob......

<正> A new kind of weak Noether symmetry for a general holonomic system is defined in such a way that themethods to cons......