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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 11364 swrdnd 11376 swrd0g 11377 summodclem2 12093 summodc 12094 zsumdc 12095 fsum3cvg3 12107 prodmodclem2 12288 prodmodc 12289 zproddc 12290 ennnfoneleminc 13246 tgval 13559 prdsval 13570 releqgg 14021 eqgex 14022 eqgfval 14023 opprsubgg 14313 unitsubm 14349 subrngpropd 14447 subrgsubm 14465 issubrg3 14478 subrgpropd 14484 lsslss 14641 lsspropdg 14691 islidlm 14739 rspcl 14751 rspssid 14752 isbasisg 15021 tgss3 15055 restbasg 15145 tgrest 15146 restopn2 15160 cnpnei 15196 cnptopresti 15215 txbas 15235 elmopn 15423 neibl 15468 dvfgg 15665 incistruhgr 16197 edgssv2en 16306 wksfval 16429 |
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