By constructing proper upper-lower solutions, the existence of travelling wave solutions was proved.
通过构造适当的上下解，证明行波解的存在性。
Methods the upper-lower solutions, monotone derivative methods, the maximum principle, comparison principle and principal eigenvalue theory were used.
方法采用上下解的方法、单调迭代法、比较原理、极值原理以及特征值理论进行了研究。
In this paper, by using generalized R-KKM type theorems in topological Spaces, some existence theorems of solutions for equilibrium problem with lower and upper bounds are obtained.
应用拓扑空间中的广义r - KK M型定理，对拓扑空间中有上下界的平衡问题，证明了解的存在性定理。
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