Concurrence Is Not Checking is a mathematical errata paper by Sen Kuro correcting Chronoarithmics 2.0.
It retracts claims of chaos in a scalar autonomous ODE, a field structure for temporal integers, and an equivalence relation called chrono-equality. It proves that well-posed state trajectories cannot meet, while an origin-indexed π-mod-n system has exactly one nontrivial intersection: 2 and 3 meet at π when time equals 1.
The paper names the Kuro Principle—“intersection requires provenance”—and argues that agreement among models is not proof. It proposes discrete maps and delay equations as mathematically valid routes to chaos.