If you satisfy the test but you are not defined everywhere then there is still a bit of ambiguity and you don't know for sure.

如果满足检验条件，但是不是处处都有定义,那就不确定了,你不能肯定，是不是梯度场。

youdao

Eigenfunction is used to describe ambiguity sets for analog circuit diagnosis. Fault isolation and conditional fault isolation are proposed to identify isolation ability of test node.

采用故障特征函数描述模拟电路故障字典法中的模糊集，提出了节点故障隔离度和条件故障隔离度的概念，用其描述节点对故障的区分能力。

youdao