Just recently (July 14th 2022) I was made aware that Francesco had passed away. I was very saddened to hear of it- we were friends for approximately 45 years. We met at the University of Connecticut (UCONN ) around 1977 when we were both PhD students in the mathematics department. We shared the same office and also the same apartment for most of the time spent there. When we met, Francesco had a BA degree in math, however his mathematical maturity and understanding was well beyond that of a person with an MA degree.