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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 6658 papeq2 7617 tapeq2 7626 fzowrddc 11442 swrdnd 11454 swrd0g 11455 summodclem2 12175 summodc 12176 zsumdc 12177 fsum3cvg3 12189 prodmodclem2 12370 prodmodc 12371 zproddc 12372 ennnfoneleminc 13361 tgval 13676 releqgg 14083 eqgex 14084 eqgfval 14085 sscntz 14159 resscntz 14167 prdsval 14281 opprsubgg 14500 unitsubm 14536 subrngpropd 14634 subrgsubm 14652 issubrg3 14665 subrgpropd 14671 lsslss 14828 lsspropdg 14878 islidlm 14926 rspcl 14938 rspssid 14939 isbasisg 15282 tgss3 15316 restbasg 15406 tgrest 15407 restopn2 15421 cnpnei 15457 cnptopresti 15476 txbas 15496 elmopn 15684 neibl 15729 dvfgg 15926 incistruhgr 16548 edgssv2en 16657 wksfval 16780 |
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