Description: The base set of a restriction to A is a subset of A . (Contributed by SN, 10-Jan-2025)
Ref | Expression | ||
---|---|---|---|
Hypothesis | ressbasss2.r | |
|
Assertion | ressbasss2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ressbasss2.r | |
|
2 | eqid | |
|
3 | 1 2 | ressbasssg | |
4 | inss1 | |
|
5 | 3 4 | sstri | |