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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 3272 | . 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 1402 ⊆ wss 3220 |
| 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 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-11 1559 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This theorem depends on definitions: df-bi 117 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-in 3226 df-ss 3233 |
| This theorem is referenced by: sseq12d 3279 sseqtrd 3286 exmidsssn 4337 exmidsssnc 4338 onsucsssucexmid 4672 sbcrel 4859 funimass2 5457 fnco 5489 fnssresb 5493 fnimaeq0 5503 foimacnv 5655 fvelimab 5756 ssimaexg 5762 fvmptss2 5777 rdgss 6648 papeq2 7604 tapeq2 7613 fzowrddc 11402 swrdnd 11414 swrd0g 11415 summodclem2 12132 summodc 12133 zsumdc 12134 fsum3cvg3 12146 prodmodclem2 12327 prodmodc 12328 zproddc 12329 ennnfoneleminc 13285 tgval 13599 releqgg 14006 eqgex 14007 eqgfval 14008 prdsval 14156 opprsubgg 14373 unitsubm 14409 subrngpropd 14507 subrgsubm 14525 issubrg3 14538 subrgpropd 14544 lsslss 14701 lsspropdg 14751 islidlm 14799 rspcl 14811 rspssid 14812 isbasisg 15128 tgss3 15162 restbasg 15252 tgrest 15253 restopn2 15267 cnpnei 15303 cnptopresti 15322 txbas 15342 elmopn 15530 neibl 15575 dvfgg 15772 incistruhgr 16314 edgssv2en 16423 wksfval 16546 |
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