On uniformly continuous function space U(G), Equivalence of invariantmean and topological invariantmean is showed by two methods.
设G为局部紧群，在一致连续函数空间U（ G）上，用两种方法证明左不变平均和拓扑左不变的等价性。
2
On the occasion of invariantmean and lower variance of demand as well as lower product return rate, the amount of product return is very stable.
在需求比较稳定，有恒定的均值，较小的方差且产品回流率较小时，回流产品非常稳定。
3
The position of knee point of Phase-frequency characteristic mean value curve is invariant, but the kurtosis of the curve near the knee point decreases.