Submitted on: 17 March 2005.
Revised on: 22 April 2005.
Accepted on: 30 April 2005.
PROCEEDINGS OF THE EDINBURGH MATHEMATICAL SOCIETY
Submitted on: 29 June 2021.
Revised on: 07 August 2021.
Accepted on: 27 August 2021.
PROCEEDINGS OF THE EDINBURGH MATHEMATICAL SOCIETY
http://reply.papertrans.cn/3/253/25277/25277-33.png
http://reply.papertrans.cn/3/253/25277/25277-34.png
http://reply.papertrans.cn/3/253/25277/25277-35.png
Submitted on: 02 September 2015.
Revised on: 03 October 2015.
Accepted on: 20 October 2015.
PROCEEDINGS OF THE EDINBURGH MATHEMATICAL SOCIETY