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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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