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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 3125 | . 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 1332 ⊆ wss 3076 |
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 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-11 1485 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-in 3082 df-ss 3089 |
This theorem is referenced by: sseq12d 3133 eqsstrd 3138 snssg 3664 ssiun2s 3865 treq 4040 onsucsssucexmid 4450 funimass1 5208 feq1 5263 sbcfg 5279 fvmptssdm 5513 fvimacnvi 5542 nnsucsssuc 6396 ereq1 6444 elpm2r 6568 fipwssg 6875 nnnninf 7031 ctssexmid 7032 iscnp 12407 iscnp4 12426 cnntr 12433 cnconst2 12441 cnptopresti 12446 cnptoprest 12447 txbas 12466 txcnp 12479 txdis 12485 txdis1cn 12486 blssps 12635 blss 12636 ssblex 12639 blin2 12640 metss2 12706 metrest 12714 metcnp3 12719 cnopnap 12802 limccl 12836 ellimc3apf 12837 |
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