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Mirrors > Home > ILE Home > Th. List > ssopab2b | Unicode version |
Description: Equivalence of ordered pair abstraction subclass and implication. (Contributed by NM, 27-Dec-1996.) (Proof shortened by Mario Carneiro, 18-Nov-2016.) |
Ref | Expression |
---|---|
ssopab2b |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfopab1 3826 | . . . 4 | |
2 | nfopab1 3826 | . . . 4 | |
3 | 1, 2 | nfss 2938 | . . 3 |
4 | nfopab2 3827 | . . . . 5 | |
5 | nfopab2 3827 | . . . . 5 | |
6 | 4, 5 | nfss 2938 | . . . 4 |
7 | ssel 2939 | . . . . 5 | |
8 | opabid 3994 | . . . . 5 | |
9 | opabid 3994 | . . . . 5 | |
10 | 7, 8, 9 | 3imtr3g 193 | . . . 4 |
11 | 6, 10 | alrimi 1415 | . . 3 |
12 | 3, 11 | alrimi 1415 | . 2 |
13 | ssopab2 4012 | . 2 | |
14 | 12, 13 | impbii 117 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wb 98 wal 1241 wcel 1393 wss 2917 cop 3378 copab 3817 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-14 1405 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-sep 3875 ax-pow 3927 ax-pr 3944 |
This theorem depends on definitions: df-bi 110 df-3an 887 df-tru 1246 df-nf 1350 df-sb 1646 df-eu 1903 df-mo 1904 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-ral 2311 df-v 2559 df-un 2922 df-in 2924 df-ss 2931 df-pw 3361 df-sn 3381 df-pr 3382 df-op 3384 df-opab 3819 |
This theorem is referenced by: eqopab2b 4016 dffun2 4912 |
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