Ackermann
Ackermann (function) is a DSA topic. In plain words you use it for a short Ackermann function example in a short dry-run on paper. Don’t start with a slogan — start with that picture.
Smallest example: the smallest Ackermann function example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Ackermann (function).
From the example next to this theory — Ackermann (function) — Dry-run [4, 1, 3].
Trap — only saying “Ackermann function” with no example. Fix that before you talk about advanced DSA.
Viva — what is Ackermann (function)? Then show the smallest Ackermann function example you can type. Then name the trap.
What is Ackermann (function)? Show this: the smallest Ackermann function example you can type. Trap: only saying “Ackermann function” with no example.