Disjoint sets $A,B\subseteq\mathbb N$ are <recursively inseparable sets>[recursively inseparable] when there is no recursive $C\subseteq\mathbb N$ such that
$$
A\subseteq C,
\qquad
B\cap C=\varnothing.
$$

Solved by gpt-5.6-sol high.

Solution

Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 120 / 2 / e / Solution

 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2026/iii/paper-120/2/e/solution