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Mirrors > Home > MPE Home > Th. List > eqsstri | Structured version Visualization version Unicode version |
Description: Substitution of equality into a subclass relationship. (Contributed by NM, 16-Jul-1995.) |
Ref | Expression |
---|---|
eqsstr.1 | |
eqsstr.2 |
Ref | Expression |
---|---|
eqsstri |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqsstr.2 | . 2 | |
2 | eqsstr.1 | . . 3 | |
3 | 2 | sseq1i 3629 | . 2 |
4 | 1, 3 | mpbir 221 | 1 |
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