For a Diophantine triple {a,b,c} over a field K of characteristic 0, the extending elements are x(T)=X(T)/abc for T in the coset P0+2E(K) of the induced curve E
No rational Diophantine septuple is known, and none has been ruled out. We give height-certified negative results near known sextuples. For a triple inside a tu
No rational Diophantine septuple is known, and none has been ruled out. Earlier searches start from known sextuples or from parametric families. We instead trea
The regular-quintuple graph $G(A)$ of a putative rational Diophantine septuple $A$ is triangle-free, and the case of maximum degree at most 2 without 4-cycles i
Paper 40 attaches to a rational Diophantine septuple $A$ a triangle-free graph $G(A)$: $p\sim q$ when $A\setminus\{p,q\}$ is a regular quintuple. We treat a ver
We study the ordered entry surface of the four completions supplied by the order-three Diophantine-triple condition. Building on the four-regular-quintuple and
In the order-four construction of rational Diophantine septuples, a triple is extended by four translates of a point by a point $S$ of order four on its induced