在這篇文章，我們從通解的型態來考慮平衡態模型縮減問題。並由連續型、離散型一連串的問題探討至周期性的模型縮減問題。

In this thesis, we are to be deal with balanced model reduction for descriptor systems. We first consider the model reduction for a continuous-time descriptor system, then a discrete-time descriptor system. Finally, we study the model reduction for periodic descriptor systems.

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