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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 3272 | . 2 ⊢ (𝐴 = 𝐵 → (𝐶 ⊆ 𝐴 ↔ 𝐶 ⊆ 𝐵)) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐶 ⊆ 𝐴 ↔ 𝐶 ⊆ 𝐵)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 = wceq 1402 ⊆ wss 3220 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-11 1559 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-in 3226 df-ss 3233 |
| This theorem is used by: sseq12d 3279 sseqtrd 3286 exmidsssn 4339 exmidsssnc 4340 onsucsssucexmid 4674 sbcrel 4861 funimass2 5459 fnco 5491 fnssresb 5495 fnimaeq0 5505 foimacnv 5657 fvelimab 5759 ssimaexg 5765 fvmptss2 5780 rdgss 6654 papeq2 7610 tapeq2 7619 fzowrddc 11421 swrdnd 11433 swrd0g 11434 summodclem2 12151 summodc 12152 zsumdc 12153 fsum3cvg3 12165 prodmodclem2 12346 prodmodc 12347 zproddc 12348 ennnfoneleminc 13304 tgval 13618 releqgg 14025 eqgex 14026 eqgfval 14027 prdsval 14175 opprsubgg 14392 unitsubm 14428 subrngpropd 14526 subrgsubm 14544 issubrg3 14557 subrgpropd 14563 lsslss 14720 lsspropdg 14770 islidlm 14818 rspcl 14830 rspssid 14831 isbasisg 15147 tgss3 15181 restbasg 15271 tgrest 15272 restopn2 15286 cnpnei 15322 cnptopresti 15341 txbas 15361 elmopn 15549 neibl 15594 dvfgg 15791 incistruhgr 16343 edgssv2en 16452 wksfval 16575 |
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