I have discovered a truly marvelous proof of this, which however the margin is not large enough to contain.
Pierre de FermatAnd perhaps, posterity will thank me for having shown that the ancients did not know everything.
Pierre de FermatIt is impossible for any number which is a power greater than the second to be written as a sum of two like powers. I have a truly marvelous demonstration of this proposition which this margin is too narrow to contain.
Pierre de Fermat