Description: Obsolete version of ssinss1 as of 10-Jun-2026. (Contributed by NM, 14-Sep-1999) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | ssinss1OLD | |- ( A C_ C -> ( A i^i B ) C_ C ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | inss1 | |- ( A i^i B ) C_ A |
|
| 2 | sstr2 | |- ( ( A i^i B ) C_ A -> ( A C_ C -> ( A i^i B ) C_ C ) ) |
|
| 3 | 1 2 | ax-mp | |- ( A C_ C -> ( A i^i B ) C_ C ) |