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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 3271 | . 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 1402 ⊆ wss 3220 |
| 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 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 theorem 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 referenced by: sseq12d 3279 eqsstrd 3284 snssgOLD 3849 ssiun2s 4054 treq 4233 onsucsssucexmid 4672 funimass1 5456 feq1 5514 sbcfg 5530 fvmptssdm 5787 fvimacnvi 5817 nnsucsssuc 6759 ereq1 6808 elpm2r 6934 fipwssg 7307 nnnninf 7460 ctssexmid 7484 rspssp 14814 iscnp 15283 iscnp4 15302 cnntr 15309 cnconst2 15317 cnptopresti 15322 cnptoprest 15323 txbas 15342 txcnp 15355 txdis 15361 txdis1cn 15362 blssps 15511 blss 15512 ssblex 15515 blin2 15516 metss2 15582 metrest 15590 metcnp3 15595 cnopnap 15695 limccl 15743 ellimc3apf 15744 ausgrumgrien 16394 ausgrusgrien 16395 eupth2lem3lem4fi 16697 |
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