Starting from the concept of whether or not the transfer function can be made common denomination, a new algebraic criterion of controllability and observability is introduced.
首先从传递函数可否约分的概念出发，提出了可控可观测新的代数判据；
Algebraic immunity is a new cryptographic criterion proposed to against algebraic attacks.
代数免疫是随着代数攻击的出现而提出来的一个新的密码学特性。
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