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| Mirrors > Home > ILE Home > Th. List > sseq2d | GIF version | ||
| Description: An equality deduction for the subclass relationship. (Contributed by NM, 14-Aug-1994.) |
| Ref | Expression |
|---|---|
| sseq1d.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
| Ref | Expression |
|---|---|
| sseq2d | ⊢ (𝜑 → (𝐶 ⊆ 𝐴 ↔ 𝐶 ⊆ 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sseq1d.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 2 | sseq2 3249 | . 2 ⊢ (𝐴 = 𝐵 → (𝐶 ⊆ 𝐴 ↔ 𝐶 ⊆ 𝐵)) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐶 ⊆ 𝐴 ↔ 𝐶 ⊆ 𝐵)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 = wceq 1395 ⊆ wss 3198 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-11 1552 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-in 3204 df-ss 3211 |
| This theorem is referenced by: sseq12d 3256 sseqtrd 3263 exmidsssn 4290 exmidsssnc 4291 onsucsssucexmid 4623 sbcrel 4810 funimass2 5405 fnco 5437 fnssresb 5441 fnimaeq0 5451 foimacnv 5598 fvelimab 5698 ssimaexg 5704 fvmptss2 5717 rdgss 6544 tapeq2 7465 fzowrddc 11221 swrdnd 11233 swrd0g 11234 summodclem2 11936 summodc 11937 zsumdc 11938 fsum3cvg3 11950 prodmodclem2 12131 prodmodc 12132 zproddc 12133 ennnfoneleminc 13025 tgval 13338 prdsval 13349 releqgg 13800 eqgex 13801 eqgfval 13802 opprsubgg 14090 unitsubm 14126 subrngpropd 14223 subrgsubm 14241 issubrg3 14254 subrgpropd 14260 lsslss 14388 lsspropdg 14438 islidlm 14486 rspcl 14498 rspssid 14499 isbasisg 14761 tgss3 14795 restbasg 14885 tgrest 14886 restopn2 14900 cnpnei 14936 cnptopresti 14955 txbas 14975 elmopn 15163 neibl 15208 dvfgg 15405 incistruhgr 15934 edgssv2en 16043 wksfval 16133 |
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