"It is impossible for a cube to be written as a sum of two cubes or a fourth power to be written as the sum of two fourth powers or, in general, for any number which is a power greater than the second to be written as a sum of two like powers." To this far-reaching statement-Fermat's Last Theorem-he appended the comment: "I have a truly marvelous demonstration of this proposition which this margin is too narrow to contain."

— The Man Who Loved Only Numbers: The Story of Paul Erdős and the Search for Mathematical Truth di Paul Hoffman (Pagina 188)