http://reply.papertrans.cn/1/14/1364/1364-21.png
Submitted on: 06 December 2010.
Revised on: 06 March 2011.
Accepted on: 03 April 2011.
___________________AMERICAN JOURNAL OF MATHEMATICS
Submitted on: 06 July 2006.
Revised on: 27 July 2006.
Accepted on: 20 August 2006.
___________________AMERICAN JOURNAL OF MATHEMATICS
Submitted on: 30 September 2014.
Revised on: 21 January 2015.
Accepted on: 16 February 2015.
___________________AMERICAN JOURNAL OF MATHEMATICS
http://reply.papertrans.cn/1/14/1364/1364-25.png
Submitted on: 06 March 2020.
Revised on: 22 June 2020.
Accepted on: 07 August 2020.
___________________AMERICAN JOURNAL OF MATHEMATICS
Submitted on: 23 July 2019.
Revised on: 16 September 2019.
Accepted on: 12 October 2019.
___________________AMERICAN JOURNAL OF MATHEMATICS
http://reply.papertrans.cn/1/14/1364/1364-28.png
http://reply.papertrans.cn/1/14/1364/1364-29.png
Submitted on: 07 June 2001.
Revised on: 15 August 2001.
Accepted on: 22 September 2001.
___________________AMERICAN JOURNAL OF MATHEMATICS