for six weeks. I met him in 1968 (Liverpool. He left for University of Michigan in the mid eighties) and have been actively collaborating with him since 1994 though I have not been active mathematically in the recent years. But we have some work to complete and hope to finish it in the next few weeks. So, there will be very few postings in the next few weeks: most probably things that I find interesting but have not read carefully or done any backround checking (not that I do it all the time).