He had been hoping not only to have a holiday, but to complete the second volume of Courant- Hilbert when away from his duties in the Mathematics Institute. Friedrichs was with Courant to help with the book.
Siya had been hoping hindi lamang upang magkaroon ng isang legal na araw ng pahinga, ngunit upang makumpleto ang pangalawang dami ng Courant-Hilbert kapag ang layo mula sa kanyang tungkulin sa Mathematics Institute. Friedrichs ay may Courant sa tulong sa mga libro.