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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 3263 | . 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 3213 |
| 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 3219 df-ss 3226 |
| This theorem is referenced by: sseq12d 3271 eqsstrd 3276 snssgOLD 3832 ssiun2s 4037 treq 4216 onsucsssucexmid 4651 funimass1 5435 feq1 5493 sbcfg 5509 fvmptssdm 5764 fvimacnvi 5794 nnsucsssuc 6727 ereq1 6776 elpm2r 6902 fipwssg 7268 nnnninf 7419 ctssexmid 7443 rspssp 14691 iscnp 15113 iscnp4 15132 cnntr 15139 cnconst2 15147 cnptopresti 15152 cnptoprest 15153 txbas 15172 txcnp 15185 txdis 15191 txdis1cn 15192 blssps 15341 blss 15342 ssblex 15345 blin2 15346 metss2 15412 metrest 15420 metcnp3 15425 cnopnap 15525 limccl 15573 ellimc3apf 15574 ausgrumgrien 16214 ausgrusgrien 16215 eupth2lem3lem4fi 16517 |
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