Description: Obsolete version of onuniorsuc as of 11-Jan-2025. (Contributed by NM, 13-Jun-1994) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | onssi.1 | |- A e. On |
|
| Assertion | onuniorsuciOLD | |- ( A = U. A \/ A = suc U. A ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | onssi.1 | |- A e. On |
|
| 2 | onuniorsuc | |- ( A e. On -> ( A = U. A \/ A = suc U. A ) ) |
|
| 3 | 1 2 | ax-mp | |- ( A = U. A \/ A = suc U. A ) |