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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 3248 | . 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 3197 |
| 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 3203 df-ss 3210 |
| This theorem is referenced by: sseq12d 3255 sseqtrd 3262 exmidsssn 4287 exmidsssnc 4288 onsucsssucexmid 4620 sbcrel 4807 funimass2 5402 fnco 5434 fnssresb 5438 fnimaeq0 5448 foimacnv 5595 fvelimab 5695 ssimaexg 5701 fvmptss2 5714 rdgss 6540 tapeq2 7455 fzowrddc 11200 swrdnd 11212 swrd0g 11213 summodclem2 11914 summodc 11915 zsumdc 11916 fsum3cvg3 11928 prodmodclem2 12109 prodmodc 12110 zproddc 12111 ennnfoneleminc 13003 tgval 13316 prdsval 13327 releqgg 13778 eqgex 13779 eqgfval 13780 opprsubgg 14068 unitsubm 14104 subrngpropd 14201 subrgsubm 14219 issubrg3 14232 subrgpropd 14238 lsslss 14366 lsspropdg 14416 islidlm 14464 rspcl 14476 rspssid 14477 isbasisg 14739 tgss3 14773 restbasg 14863 tgrest 14864 restopn2 14878 cnpnei 14914 cnptopresti 14933 txbas 14953 elmopn 15141 neibl 15186 dvfgg 15383 incistruhgr 15911 edgssv2en 16018 wksfval 16094 |
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