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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 3265 | . 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 1398 ⊆ wss 3214 |
| 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 2216 |
| This theorem depends on definitions: df-bi 117 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-in 3220 df-ss 3227 |
| This theorem is referenced by: sseq12d 3273 eqsstrd 3278 snssgOLD 3835 ssiun2s 4040 treq 4219 onsucsssucexmid 4654 funimass1 5438 feq1 5496 sbcfg 5512 fvmptssdm 5767 fvimacnvi 5797 nnsucsssuc 6738 ereq1 6787 elpm2r 6913 fipwssg 7279 nnnninf 7430 ctssexmid 7454 rspssp 14771 iscnp 15193 iscnp4 15212 cnntr 15219 cnconst2 15227 cnptopresti 15232 cnptoprest 15233 txbas 15252 txcnp 15265 txdis 15271 txdis1cn 15272 blssps 15421 blss 15422 ssblex 15425 blin2 15426 metss2 15492 metrest 15500 metcnp3 15505 cnopnap 15605 limccl 15653 ellimc3apf 15654 ausgrumgrien 16294 ausgrusgrien 16295 eupth2lem3lem4fi 16597 |
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