Description: An equality inference for the proper subclass relationship. (Contributed by NM, 9-Jun-2004)
Ref | Expression | ||
---|---|---|---|
Hypothesis | psseq1i.1 | |
|
Assertion | psseq1i | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | psseq1i.1 | |
|
2 | psseq1 | |
|
3 | 1 2 | ax-mp | |