Note 66 — Chapter II · THE MEANING OF NUMBERS
Charles Francis Atkinson translation
That is, “it is impossible to part a cube into two cubes, a biquadrate into two biquadrates, and generally any power above the square into two powers having the same exponent.” Fermat claimed to possess a proof of the proposition, but this has not been preserved, and no general proof has hitherto been obtained.—Tr.