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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 3120 | . 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 104 = wceq 1331 ⊆ wss 3071 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-11 1484 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-in 3077 df-ss 3084 |
This theorem is referenced by: sseq12d 3128 eqsstrd 3133 snssg 3656 ssiun2s 3857 treq 4032 onsucsssucexmid 4442 funimass1 5200 feq1 5255 sbcfg 5271 fvmptssdm 5505 fvimacnvi 5534 nnsucsssuc 6388 ereq1 6436 elpm2r 6560 fipwssg 6867 nnnninf 7023 ctssexmid 7024 iscnp 12368 iscnp4 12387 cnntr 12394 cnconst2 12402 cnptopresti 12407 cnptoprest 12408 txbas 12427 txcnp 12440 txdis 12446 txdis1cn 12447 blssps 12596 blss 12597 ssblex 12600 blin2 12601 metss2 12667 metrest 12675 metcnp3 12680 cnopnap 12763 limccl 12797 ellimc3apf 12798 |
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