There are some incorrect uses of mathematical terminology and typos in previous papers. We rewrite them precisely here.

In Lu, Wenlian, Chen, and Tianping (2008), we studied the following class of delayed differential equations:

We have noticed some misuse of mathematical terminology in this previous letter, and rewrite them precisely here.

The following paragraph is from that letter (pp. 1075–1076):

It should be rewritten as:

We claim

Similarly, on page 696 of Lu, Wenlian, Chen, and Tianping (2006), there is a problem in the following paragraph:

For each

The correct wording is:

For each

Moreover, inequality 4.3 on page 1085 of Lu, Wenlian, Chen, and Tianping (2008),