He was sixty-four and very active mathematically up to the time of his death, so much so that many interesting unpublished results were found among his papers and they were published posthumously.
Siya ay animnapu-apat na at napaka-aktibo mathematically hanggang sa ang panahon ng kanyang kamatayan, kaya marami kaya na-publish ng maraming mga kagiliw-giliw na mga resulta ay natagpuan sa kanyang mga papeles at sila ay inilathala posthumously.