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Mirrors > Home > ILE Home > Th. List > sbrbis | Unicode version |
Description: Introduce right biconditional inside of a substitution. (Contributed by NM, 18-Aug-1993.) |
Ref | Expression |
---|---|
sbrbis.1 |
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Ref | Expression |
---|---|
sbrbis |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sbbi 1933 |
. 2
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2 | sbrbis.1 |
. . 3
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3 | 2 | bibi1i 227 |
. 2
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4 | 1, 3 | bitri 183 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 |
This theorem depends on definitions: df-bi 116 df-nf 1438 df-sb 1737 |
This theorem is referenced by: sbrbif 1936 sbabel 2308 |
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