All his books were typed on the 1927 Remington typewriter, on which he wrote his doctoral thesis, which he had modified by including some mathematical symbols instead of characters such as!,?, and 1.
Ang lahat ng kanyang mga libro ay na-type sa 1927 Remington makinilya, na kung saan siya wrote kanyang doktor tisis, na kung saan siya nagkaroon ng pagbabago sa pamamagitan ng kasama ang ilang matematiko simbolo sa halip ng mga character tulad ng!,?, At 1.