Sometimes difficult results appeared with hardly a proof as if they were obvious to Wiener, while at other times he would give a lengthy proof of a triviality. Freudenthal writes:
Minsan mahirap lumabas sa mga resulta ng bahagya ng isang patunay na kung sila ay kitang-kita sa Wiener, habang sa iba pang beses na siya ay bigyan ng mahahabang patunay ng isang maliit na bagay. Freudenthal magsusulat: