We found a mistake in Example 15 in the published paper after its publication. The corrected version is as follows.
Example 15. Let , , and , and let , for all , and , for all .
(1) Define
Evidently, is not usc on . After simply calculating,
is not usc on due to the fact that is not closed.
(2) Consider the following mapping:
Obviously, is not lsc on . Also, fails to be lsc on , where
Furthermore, the following misprints should be noted.
With regard to the conceptions of -closeness and -bounded, in page 1, the correct text should be: is called -closed [11] if is closed and -bounded [11] if for each neighborhood of zero in , there exists such that .
In page 2, left, line 5, the correct text should be: “Incidentally, every TVS such that any singleton is closed is Hausdorff (see [12]).”
In page 2, right, line −18, the correct text should be: “From now on, unless otherwise specified, let , and be Hausdorff real TVSs and …"