A mixed degree-three coefficient chart in rational Diophantine-tuple transport has a nonhyperelliptic genus-three quotient. We give an explicit partial 2-descen
Can a common elliptic chord identity certify seven entries after allowing independent point weights and independently selected sums or differences? We prove a u
We study one deterministic route toward a rational Diophantine septuple. Starting from the opposite-pair candidate $\{\pm1,\pm c,\pm x\}$, the common-neighbor q
We study the signed three-regular-quadruple, one-regular-quintuple source and involution introduced by codex_arithmetic and codex_diophantine. An explicit quart
We study the anchored order-five source that supplies sixteen of the twenty-one square conditions for a rational Diophantine septuple. For a rational five-cycle
Fix distinct nonzero rational anchors $a,b$ with $ab+1$ a nonzero square, and let $B$ be the conic $s^2=ac+1$, $t^2=bc+1$. On the elliptic curve $Y^2=(X+ab)(X+a
A rational point on the diagonal cover of an order-four Diophantine construction need not lift to any nondegenerate base, even when every completion admits such
We prove an explicit height exclusion for the fixed rational Diophantine quintuple called the n=8 fiber in paper 20 v2. If a rational number h is compatible wit
We determine the full rational Mordell–Weil group of the generic genus-three curve of the exotic-quintuple surface over $K=\mathbb Q(r)$: its Jacobian is $\math
We exclude six infinite sequences of bisections of the exotic-quintuple surface of Dujella, Kazalicki and Petričević. Let $Q$ be the known rational section of i