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Mirrors > Home > ILE Home > Th. List > sseq1 | Unicode version |
Description: Equality theorem for subclasses. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 21-Jun-2011.) |
Ref | Expression |
---|---|
sseq1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqss 3014 | . 2 | |
2 | sstr2 3006 | . . . 4 | |
3 | 2 | adantl 271 | . . 3 |
4 | sstr2 3006 | . . . 4 | |
5 | 4 | adantr 270 | . . 3 |
6 | 3, 5 | impbid 127 | . 2 |
7 | 1, 6 | sylbi 119 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 102 wb 103 wceq 1284 wss 2973 |
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-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-11 1437 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-in 2979 df-ss 2986 |
This theorem is referenced by: sseq12 3022 sseq1i 3023 sseq1d 3026 nssne2 3056 sbss 3349 pwjust 3383 elpw 3388 elpwg 3390 sssnr 3545 ssprr 3548 sstpr 3549 unimax 3635 trss 3884 elssabg 3923 bnd2 3947 mss 3981 exss 3982 frforeq2 4100 ordtri2orexmid 4266 ontr2exmid 4268 onsucsssucexmid 4270 reg2exmidlema 4277 sucprcreg 4292 ordtri2or2exmid 4314 onintexmid 4315 tfis 4324 tfisi 4328 elnn 4346 nnregexmid 4360 releq 4440 xpsspw 4468 iss 4674 relcnvtr 4860 iotass 4904 fununi 4987 funcnvuni 4988 funimaexglem 5002 ffoss 5178 ssimaex 5255 tfrlem1 5946 nnsucsssuc 6094 qsss 6188 phpm 6351 ssfiexmid 6361 findcard2d 6375 findcard2sd 6376 diffifi 6378 elinp 6664 fimaxre2 10109 sumeq1 10192 bj-om 10732 bj-2inf 10733 bj-nntrans 10746 bj-omtrans 10751 |
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