In an infinitedimensionalspace there always exist two subspaces whose vector sum is different from their span.
在一无限空间中恒存在两个子空间，其矢量和与其张成空间不同。
2
Large space structures are infinite-dimensional distributed-parameter systems, which theoretically have infinite number of vibration modes.
大型空间柔性结构是无穷维的分布式参数系统，理论上具有无穷多个振动模态。
3
In this paper, the concept of strong acute cone is introduced, and the necessary and sufficient condition for existing such cone in a infinitedimensionalspace is obtained.