http://reply.papertrans.cn/2/115/11458/11458-21.png
http://reply.papertrans.cn/2/115/11458/11458-22.png
http://reply.papertrans.cn/2/115/11458/11458-23.png
Submitted on: 03 November 2003.
Revised on: 01 December 2003.
Accepted on: 19 January 2004.
___________________Hokkaido Mathematical Journal---HOKKAIDO UNIV, DEPT MATHEMATICS
Submitted on: 20 June 2021.
Revised on: 18 August 2021.
Accepted on: 17 September 2021.
___________________Hokkaido Mathematical Journal---HOKKAIDO UNIV, DEPT MATHEMATICS
Submitted on: 26 July 2009.
Revised on: 20 August 2009.
Accepted on: 17 September 2009.
___________________Hokkaido Mathematical Journal---HOKKAIDO UNIV, DEPT MATHEMATICS
http://reply.papertrans.cn/2/115/11458/11458-27.png
http://reply.papertrans.cn/2/115/11458/11458-28.png
http://reply.papertrans.cn/2/115/11458/11458-29.png
Submitted on: 22 April 2022.
Revised on: 26 July 2022.
Accepted on: 22 August 2022.
___________________Hokkaido Mathematical Journal---HOKKAIDO UNIV, DEPT MATHEMATICS