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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 3251 | . 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 1397 ⊆ wss 3200 |
| 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 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-11 1554 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-in 3206 df-ss 3213 |
| This theorem is referenced by: sseq12d 3258 sseqtrd 3265 exmidsssn 4292 exmidsssnc 4293 onsucsssucexmid 4625 sbcrel 4812 funimass2 5408 fnco 5440 fnssresb 5444 fnimaeq0 5454 foimacnv 5601 fvelimab 5702 ssimaexg 5708 fvmptss2 5721 rdgss 6549 tapeq2 7472 fzowrddc 11228 swrdnd 11240 swrd0g 11241 summodclem2 11944 summodc 11945 zsumdc 11946 fsum3cvg3 11958 prodmodclem2 12139 prodmodc 12140 zproddc 12141 ennnfoneleminc 13033 tgval 13346 prdsval 13357 releqgg 13808 eqgex 13809 eqgfval 13810 opprsubgg 14099 unitsubm 14135 subrngpropd 14232 subrgsubm 14250 issubrg3 14263 subrgpropd 14269 lsslss 14397 lsspropdg 14447 islidlm 14495 rspcl 14507 rspssid 14508 isbasisg 14770 tgss3 14804 restbasg 14894 tgrest 14895 restopn2 14909 cnpnei 14945 cnptopresti 14964 txbas 14984 elmopn 15172 neibl 15217 dvfgg 15414 incistruhgr 15943 edgssv2en 16052 wksfval 16175 |
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