just discovered a document which is obviously left from P. de Fermat. The size of the paper was astonishing; in the cryptic words of the header line he recurred to his sproblem of too small margins in contemporary scientific books.
On this note he left us a formula, which ontains y and x in implicite form. He annotated this formula as one of his greatest proceedings to match human mind and maths. He seems to have stated that even after his "last theorem"; but he didn't retrieve a theorem of this equivalence, so his second great contribution to maths would not be devaluated.
I was not able to write it down in explicite form for y; but possibly someone with a CAS is able to do that. In the meantime I searched with brute force for solutions in x and y for the term to be zero. The plotted result was an astonishing example of math-of-objects (an early OOM?).