First via a counter example it is shown that the Proposition 3 of Anbarci & Sun
(2013) is false. Then a gap and a mistake in their proof are identified.
Finally, a modified version of their Proposition 3 is stated and proved.
First via a counter example it is shown that the Proposition 3 of Anbarci & Sun
(2013) is false. Then a gap and a mistake in their proof are identified.
Finally, a modified version of their Proposition 3 is stated and proved.