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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 |
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eqeltr.2 |
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Ref | Expression |
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eqeltri |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqeltr.2 |
. 2
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2 | eqeltr.1 |
. . 3
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3 | 2 | eleq1i 2692 |
. 2
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4 | 1, 3 | mpbir 221 |
1
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