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Mirrors > Home > MPE Home > Th. List > sseqtr4i | Structured version Visualization version Unicode version |
Description: Substitution of equality into a subclass relationship. (Contributed by NM, 4-Apr-1995.) |
Ref | Expression |
---|---|
sseqtr4.1 | |
sseqtr4.2 |
Ref | Expression |
---|---|
sseqtr4i |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseqtr4.1 | . 2 | |
2 | sseqtr4.2 | . . 3 | |
3 | 2 | eqcomi 2631 | . 2 |
4 | 1, 3 | sseqtri 3637 | 1 |
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