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| Mirrors > Home > ILE Home > Th. List > sseq1d | 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 |
|---|---|
| sseq1d | ⊢ (𝜑 → (𝐴 ⊆ 𝐶 ↔ 𝐵 ⊆ 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sseq1d.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 2 | sseq1 3248 | . 2 ⊢ (𝐴 = 𝐵 → (𝐴 ⊆ 𝐶 ↔ 𝐵 ⊆ 𝐶)) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐴 ⊆ 𝐶 ↔ 𝐵 ⊆ 𝐶)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 = wceq 1395 ⊆ wss 3198 |
| 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 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-11 1552 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-in 3204 df-ss 3211 |
| This theorem is referenced by: sseq12d 3256 eqsstrd 3261 snssgOLD 3807 ssiun2s 4012 treq 4191 onsucsssucexmid 4623 funimass1 5404 feq1 5462 sbcfg 5478 fvmptssdm 5727 fvimacnvi 5757 nnsucsssuc 6655 ereq1 6704 elpm2r 6830 fipwssg 7172 nnnninf 7319 ctssexmid 7343 rspssp 14501 iscnp 14916 iscnp4 14935 cnntr 14942 cnconst2 14950 cnptopresti 14955 cnptoprest 14956 txbas 14975 txcnp 14988 txdis 14994 txdis1cn 14995 blssps 15144 blss 15145 ssblex 15148 blin2 15149 metss2 15215 metrest 15223 metcnp3 15228 cnopnap 15328 limccl 15376 ellimc3apf 15377 ausgrumgrien 16014 ausgrusgrien 16015 |
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