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Mirrors > Home > ILE Home > Th. List > r19.12sn | Unicode version |
Description: Special case of r19.12 2478 where its converse holds. (Contributed by NM, 19-May-2008.) (Revised by Mario Carneiro, 23-Apr-2015.) (Revised by BJ, 20-Dec-2021.) |
Ref | Expression |
---|---|
r19.12sn |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sbcralg 2917 |
. 2
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2 | rexsns 3482 |
. 2
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3 | rexsns 3482 |
. . 3
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4 | 3 | ralbii 2384 |
. 2
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5 | 1, 2, 4 | 3bitr4g 221 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 665 ax-5 1381 ax-7 1382 ax-gen 1383 ax-ie1 1427 ax-ie2 1428 ax-8 1440 ax-10 1441 ax-11 1442 ax-i12 1443 ax-bndl 1444 ax-4 1445 ax-17 1464 ax-i9 1468 ax-ial 1472 ax-i5r 1473 ax-ext 2070 |
This theorem depends on definitions: df-bi 115 df-tru 1292 df-nf 1395 df-sb 1693 df-clab 2075 df-cleq 2081 df-clel 2084 df-nfc 2217 df-ral 2364 df-rex 2365 df-v 2621 df-sbc 2841 df-sn 3452 |
This theorem is referenced by: (None) |
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