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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 3272 | . 2 ⊢ (𝐴 = 𝐵 → (𝐶 ⊆ 𝐴 ↔ 𝐶 ⊆ 𝐵)) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐶 ⊆ 𝐴 ↔ 𝐶 ⊆ 𝐵)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 = wceq 1402 ⊆ wss 3220 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-11 1559 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-in 3226 df-ss 3233 |
| This theorem is used by: sseq12d 3279 sseqtrd 3286 exmidsssn 4341 exmidsssnc 4342 onsucsssucexmid 4676 sbcrel 4863 funimass2 5462 fnco 5494 fnssresb 5498 fnimaeq0 5508 foimacnv 5660 fvelimab 5762 ssimaexg 5768 fvmptss2 5783 rdgss 6659 isfsuppfi 7296 funisfsuppdc 7299 papeq2 7617 tapeq2 7626 fzowrddc 11441 swrdnd 11453 swrd0g 11454 summodclem2 12174 summodc 12175 zsumdc 12176 fsum3cvg3 12188 prodmodclem2 12369 prodmodc 12370 zproddc 12371 ennnfoneleminc 13360 tgval 13675 releqgg 14082 eqgex 14083 eqgfval 14084 sscntz 14158 resscntz 14166 prdsval 14280 opprsubgg 14499 unitsubm 14535 subrngpropd 14633 subrgsubm 14651 issubrg3 14664 subrgpropd 14670 lsslss 14827 lsspropdg 14877 islidlm 14925 rspcl 14937 rspssid 14938 psrbagfsuppub 15192 mplsubgfilemcl 15246 mplsubgfileminv 15247 isbasisg 15303 tgss3 15337 restbasg 15427 tgrest 15428 restopn2 15442 cnpnei 15478 cnptopresti 15497 txbas 15517 elmopn 15705 neibl 15750 dvfgg 15947 incistruhgr 16569 edgssv2en 16678 wksfval 16801 |
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