Two years later he published a matrix method of calculating Fourier coefficients which, over 25 years later, was recognised as the 'Fast Fourier Transform' algorithm described by Tukey . Lanczos continued to work on his first love of relativity and corresponded with Einstein both on a scientific level and as a friend.
Dalawang taon mamaya siya nai-publish ng isang matris na paraan ng pagkalkula Fourier coefficients na kung saan, mahigit sa 25 years later, ay kinikilala bilang 'Fast Fourier-anyo' algorithm inilarawan sa pamamagitan ng Tukey. Lanczos patuloy na magtrabaho sa kanyang unang pag-ibig ng kapamanggitan at corresponded sa Einstein pareho sa isang pang-agham na antas at bilang isang kaibigan.