Paul R. Halmos died
on Yom Kippur, 2006
on Yom Kippur, 2006
“Prof. Paul Halmos died of pneumonia early in the morning of October 2, 2006. He was 90 years old. He is survived by his wife, Virginia Halmos. An obituary may be found at the website of the Mathematical Association of America….”
— Halmos’s home page
at Santa Clara University
For a memorial of sorts, see
Lovely, Dark and Deep.
Update of 8 PM Oct. 4 —
From Google Book Search:
This is the source of the
“Halmos tombstone” symbol,
which has been described in a
different form at Wikipedia:
“The tombstone, or halmos–
symbol ∎ (Unicode U+220E)–
is used in mathematics to denote
the end of a proof.”
This Unicode character is rendered
as an empty square in Explorer
and as a black square in Firefox.
Related material: