Fernando Corbato of MIT has died (reported 2019-07-13).

Test: Fernando J. Corbató of MIT had died by 2019-07-13. True: an obituary or official MIT announcement records his death on or before 2019-07-13. Mostly true: his death is confirmed, but the date reported differs trivially from what was said. False: he was alive on 2019-07-13, as shown by a later record giving a date of death after that day.

Set before the research began.

1. E1 Fernando "Corby" Corbató (1926-2019) MIT Computer Science & Artificial Intelligence Laboratory (CSAIL) · 13 July 2019

   “died on Friday, July 12 in Newburyport. He was 93.”

2. E2 Professor Emeritus Fernando Corbató, MIT computing pioneer, dies at 93 MIT News · 15 July 2019

   “died on Friday, July 12, at his home in Newburyport, Massachusetts. He was 93.”

3. E3 Fernando Corbato | Biography, A.M. Turing Award, & Facts | Britannica Encyclopaedia Britannica

   “died July 12, 2019, Newburyport, Massachusetts”

4. E4 Computer password inventor dies aged 93 BBC News · 15 July 2019

   “Computer pioneer Fernando Corbato, who first used passwords to protect user accounts, has died aged 93.”

The MIT CSAIL obituary of 2019-07-13 (E1) says Corbató died on Friday, July 12, aged 93. The MIT News obituary (E2) and Britannica (E3) give the same date, July 12, 2019, which is before the claim date of 2019-07-13. BBC News (E4) separately reports his death at 93.