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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 11232 swrdnd 11244 swrd0g 11245 summodclem2 11948 summodc 11949 zsumdc 11950 fsum3cvg3 11962 prodmodclem2 12143 prodmodc 12144 zproddc 12145 ennnfoneleminc 13037 tgval 13350 prdsval 13361 releqgg 13812 eqgex 13813 eqgfval 13814 opprsubgg 14103 unitsubm 14139 subrngpropd 14236 subrgsubm 14254 issubrg3 14267 subrgpropd 14273 lsslss 14401 lsspropdg 14451 islidlm 14499 rspcl 14511 rspssid 14512 isbasisg 14774 tgss3 14808 restbasg 14898 tgrest 14899 restopn2 14913 cnpnei 14949 cnptopresti 14968 txbas 14988 elmopn 15176 neibl 15221 dvfgg 15418 incistruhgr 15947 edgssv2en 16056 wksfval 16179 |
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