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Mirrors > Home > MPE Home > Th. List > eqeltri | Structured version Visualization version Unicode version |
Description: Substitution of equal classes into membership relation. (Contributed by NM, 21-Jun-1993.) |
Ref | Expression |
---|---|
eqeltr.1 | |
eqeltr.2 |
Ref | Expression |
---|---|
eqeltri |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqeltr.2 | . 2 | |
2 | eqeltr.1 | . . 3 | |
3 | 2 | eleq1i 2692 | . 2 |
4 | 1, 3 | mpbir 221 | 1 |
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