Not sure if someone else already mentioned this (though I see that Wikipedia already knows): *From:* "Kharaghani, Hadi" <kharaghani@uleth.ca> *Date:* 9 March 2020 at 17:52:16 GMT It is with extreme sadness and sorrow to let you know of passing of Professor Richard Guy at 8:35 in the morning today. Hadi Jim Propp