What is the quartic undecidable Diophantine equation with 58 unknowns that's undecidable?

76 Views Asked by At

I found in Jones' 1980 work "Undecidable Diophantine Equations" Theorem 4 that it is claimed that at least one 58 unknown quartic Diophantine equation is known to be undecidable. It is not explicitly listed what the coefficients/form of this equation is in this paper; is there some place/reference where it is explicitly listed?