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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 3249 | . 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 1397 ⊆ wss 3199 |
| 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 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-11 1554 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2212 |
| This theorem depends on definitions: df-bi 117 df-nf 1509 df-sb 1810 df-clab 2217 df-cleq 2223 df-clel 2226 df-in 3205 df-ss 3212 |
| This theorem is referenced by: sseq12d 3257 eqsstrd 3262 snssgOLD 3810 ssiun2s 4015 treq 4194 onsucsssucexmid 4627 funimass1 5409 feq1 5467 sbcfg 5483 fvmptssdm 5734 fvimacnvi 5764 nnsucsssuc 6665 ereq1 6714 elpm2r 6840 fipwssg 7183 nnnninf 7330 ctssexmid 7354 rspssp 14532 iscnp 14952 iscnp4 14971 cnntr 14978 cnconst2 14986 cnptopresti 14991 cnptoprest 14992 txbas 15011 txcnp 15024 txdis 15030 txdis1cn 15031 blssps 15180 blss 15181 ssblex 15184 blin2 15185 metss2 15251 metrest 15259 metcnp3 15264 cnopnap 15364 limccl 15412 ellimc3apf 15413 ausgrumgrien 16050 ausgrusgrien 16051 eupth2lem3lem4fi 16353 |
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