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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 3252 | . 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 3201 |
| 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 2213 |
| This theorem depends on definitions: df-bi 117 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-in 3207 df-ss 3214 |
| This theorem is referenced by: sseq12d 3259 sseqtrd 3266 exmidsssn 4298 exmidsssnc 4299 onsucsssucexmid 4631 sbcrel 4818 funimass2 5415 fnco 5447 fnssresb 5451 fnimaeq0 5461 foimacnv 5610 fvelimab 5711 ssimaexg 5717 fvmptss2 5730 rdgss 6592 tapeq2 7515 fzowrddc 11275 swrdnd 11287 swrd0g 11288 summodclem2 12004 summodc 12005 zsumdc 12006 fsum3cvg3 12018 prodmodclem2 12199 prodmodc 12200 zproddc 12201 ennnfoneleminc 13093 tgval 13406 prdsval 13417 releqgg 13868 eqgex 13869 eqgfval 13870 opprsubgg 14159 unitsubm 14195 subrngpropd 14292 subrgsubm 14310 issubrg3 14323 subrgpropd 14329 lsslss 14457 lsspropdg 14507 islidlm 14555 rspcl 14567 rspssid 14568 isbasisg 14835 tgss3 14869 restbasg 14959 tgrest 14960 restopn2 14974 cnpnei 15010 cnptopresti 15029 txbas 15049 elmopn 15237 neibl 15282 dvfgg 15479 incistruhgr 16011 edgssv2en 16120 wksfval 16243 |
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