The inhomogeneous nonlinear difusion equation is studied by invariant subspace and conditional Lie-Bcklund symmetry methods.It is shown that the equations admit a class of invariant subspaces governed by the nonlinear ordinary diferential equations,which is equivalent to a kind of higher-order conditional Lie-Bcklund symmetries of the equations.As a consequence,a number of new solutions to the inhomogeneous nonlinear difusion equations are constructed explicitly or reduced to solving fnite-dimensional dynamical systems.
研究了一类带有非线性耗散项的双曲型方程 u tt - ∑ n i=1 ( ? u ? x i p-2 ? u ? x i )+a|u t| q-2 u t=b|u| r-2 u 在有界闭区域内的初边值问题,通过在Sobolev空间W 1,p 0(Ω) 上构造稳定集,证明了这类问题的整体解的存在性,并利用Komornik的一个重要引理给出了整体解的渐近性态.
