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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 3266 | . 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 1398 ⊆ wss 3214 |
| 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 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-11 1555 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2216 |
| This theorem depends on definitions: df-bi 117 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-in 3220 df-ss 3227 |
| This theorem is referenced by: sseq12d 3273 sseqtrd 3280 exmidsssn 4320 exmidsssnc 4321 onsucsssucexmid 4654 sbcrel 4841 funimass2 5439 fnco 5471 fnssresb 5475 fnimaeq0 5485 foimacnv 5637 fvelimab 5738 ssimaexg 5744 fvmptss2 5757 rdgss 6627 papeq2 7574 tapeq2 7583 fzowrddc 11367 swrdnd 11379 swrd0g 11380 summodclem2 12097 summodc 12098 zsumdc 12099 fsum3cvg3 12111 prodmodclem2 12292 prodmodc 12293 zproddc 12294 ennnfoneleminc 13250 tgval 13563 releqgg 13977 eqgex 13978 eqgfval 13979 prdsval 14119 opprsubgg 14332 unitsubm 14368 subrngpropd 14466 subrgsubm 14484 issubrg3 14497 subrgpropd 14503 lsslss 14659 lsspropdg 14709 islidlm 14757 rspcl 14769 rspssid 14770 isbasisg 15039 tgss3 15073 restbasg 15163 tgrest 15164 restopn2 15178 cnpnei 15214 cnptopresti 15233 txbas 15253 elmopn 15441 neibl 15486 dvfgg 15683 incistruhgr 16215 edgssv2en 16324 wksfval 16447 |
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