延迟线；延迟元件，一般符号。

Delay line; Delay element, general symbol.

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讨论了一般符号模式矩阵的幂等性和广义逆。

I discuss idempotent, generalized inverses of general sign pattern matrix.

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符号动力系统是动力系统理论研究的强有力工具，一般符号动力系统的动力学性质的研究是一个远未解决的课题。

Symbolic dynamical system is a powerful tool in the study of dynamical systems theories, the study of dynamical properties of the general symbolic dynamical system is a far unsolved problem.

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