"Ambrose, Warren Arthur," . . "Chicago (Ill.)" . . "Boas, Ralph Philip." . . "American Mathematical Society." . . "Von Neumann, John," . . . . "Mathematical Association of America. American Mathematical Monthly." . . "Budapest (Hungary)" . . "Gillman, Leonard." . . "Mathematical Intelligencer." . . "Mathematical Association of America." . . "Santa Clara (Calif.)" . . "Halmos, Paul R. (Paul Richard)," . . "Linear algebras." . . "Montevideo (Uruguay)" . . . . . . . . . . . . "Correspondence, notes, lectures, publications, and teaching materials (1916-2006) document the mathematical career of Paul R. Halmos as a teacher, editor of mathematical publications, and as an author and lecturer."@en . . . . . . . . . . . . . . . "Halmos, Paul R., papers"@en . . . . . . . . . . . . . . . . . . . . . "Doob, Joseph L." . . "Willcox, Alfred B.," . . "Bloomington (Ind.)" . .