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Mirrors > Home > MPE Home > Th. List > rabbiia | Structured version Visualization version Unicode version |
Description: Equivalent wff's yield equal restricted class abstractions (inference rule). (Contributed by NM, 22-May-1999.) |
Ref | Expression |
---|---|
rabbiia.1 |
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Ref | Expression |
---|---|
rabbiia |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rabbiia.1 |
. . . 4
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2 | 1 | pm5.32i 669 |
. . 3
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3 | 2 | abbii 2739 |
. 2
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4 | df-rab 2921 |
. 2
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5 | df-rab 2921 |
. 2
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6 | 3, 4, 5 | 3eqtr4i 2654 |
1
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