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| Mirrors > Home > ILE Home > Th. List > ssrab2 | Unicode version | ||
| Description: Subclass relation for a restricted class. (Contributed by NM, 19-Mar-1997.) |
| Ref | Expression |
|---|---|
| ssrab2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-rab 2484 |
. 2
| |
| 2 | ssab2 3267 |
. 2
| |
| 3 | 1, 2 | eqsstri 3215 |
1
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