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: |
|---|---|---|---|
| toSet-one | proved | all subs proved | toSet-ext, |
| toSet-empty | proved | all subs proved | toSet-ext, |
| toSet-diff-old | proved | all subs proved | toSet-ext, |
| toSet-diff-new | proved | all subs proved | toSet-ext, |
| toSet-app | proved | all subs proved | toSet-ext, |
| toSet-ext | axiom |