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Mirrors > Home > MPE Home > Th. List > 3sstr4d | Structured version Visualization version Unicode version |
Description: Substitution of equality into both sides of a subclass relationship. (Contributed by NM, 30-Nov-1995.) (Proof shortened by Eric Schmidt, 26-Jan-2007.) |
Ref | Expression |
---|---|
3sstr4d.1 | |
3sstr4d.2 | |
3sstr4d.3 |
Ref | Expression |
---|---|
3sstr4d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3sstr4d.1 | . 2 | |
2 | 3sstr4d.2 | . . 3 | |
3 | 3sstr4d.3 | . . 3 | |
4 | 2, 3 | sseq12d 3634 | . 2 |
5 | 1, 4 | mpbird 247 | 1 |
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