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Mirrors > Home > ILE Home > Th. List > sseq2d | 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 |
---|---|
sseq2d | ⊢ (𝜑 → (𝐶 ⊆ 𝐴 ↔ 𝐶 ⊆ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq1d.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
2 | sseq2 3121 | . 2 ⊢ (𝐴 = 𝐵 → (𝐶 ⊆ 𝐴 ↔ 𝐶 ⊆ 𝐵)) | |
3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐶 ⊆ 𝐴 ↔ 𝐶 ⊆ 𝐵)) |
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 sseqtrd 3135 exmidsssn 4125 exmidsssnc 4126 onsucsssucexmid 4442 sbcrel 4625 funimass2 5201 fnco 5231 fnssresb 5235 fnimaeq0 5244 foimacnv 5385 fvelimab 5477 ssimaexg 5483 fvmptss2 5496 rdgss 6280 summodclem2 11151 summodc 11152 zsumdc 11153 fsum3cvg3 11165 prodmodclem2 11346 prodmodc 11347 ennnfoneleminc 11924 isbasisg 12211 tgval 12218 tgss3 12247 restbasg 12337 tgrest 12338 restopn2 12352 cnpnei 12388 cnptopresti 12407 txbas 12427 elmopn 12615 neibl 12660 dvfgg 12826 |
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