A lemma (entry) may depend on lemmas (entries) below its position, but never on lemmas above its position. This means the list is a topological order of the dependency graph. An entry 'all subs proved' means that all used lemmas are (transitively) proved.
| Name: | Status: | Subs proved? | Used: |
|---|---|---|---|
| challenge3 | proved | all subs proved | challenge3b, challenge3a, |
| challenge3b | proved | all subs proved | FINDDUPSND, |
| challenge3a | proved | all subs proved | FINDDUP, |
| FINDDUPSND | axiom | ||
| FINDDUP | axiom |