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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 3261 | . 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 3210 |
| 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 2214 |
| This theorem depends on definitions: df-bi 117 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-in 3216 df-ss 3223 |
| This theorem is referenced by: sseq12d 3268 sseqtrd 3275 exmidsssn 4314 exmidsssnc 4315 onsucsssucexmid 4648 sbcrel 4835 funimass2 5433 fnco 5465 fnssresb 5469 fnimaeq0 5479 foimacnv 5631 fvelimab 5732 ssimaexg 5738 fvmptss2 5751 rdgss 6613 tapeq2 7566 fzowrddc 11335 swrdnd 11347 swrd0g 11348 summodclem2 12064 summodc 12065 zsumdc 12066 fsum3cvg3 12078 prodmodclem2 12259 prodmodc 12260 zproddc 12261 ennnfoneleminc 13154 tgval 13467 prdsval 13478 releqgg 13929 eqgex 13930 eqgfval 13931 opprsubgg 14220 unitsubm 14256 subrngpropd 14353 subrgsubm 14371 issubrg3 14384 subrgpropd 14390 lsslss 14521 lsspropdg 14571 islidlm 14619 rspcl 14631 rspssid 14632 isbasisg 14901 tgss3 14935 restbasg 15025 tgrest 15026 restopn2 15040 cnpnei 15076 cnptopresti 15095 txbas 15115 elmopn 15303 neibl 15348 dvfgg 15545 incistruhgr 16077 edgssv2en 16186 wksfval 16309 |
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