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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 7611 tapeq2 7620 fzowrddc 11435 swrdnd 11447 swrd0g 11448 summodclem2 12168 summodc 12169 zsumdc 12170 fsum3cvg3 12182 prodmodclem2 12363 prodmodc 12364 zproddc 12365 ennnfoneleminc 13354 tgval 13669 releqgg 14076 eqgex 14077 eqgfval 14078 sscntz 14152 resscntz 14160 prdsval 14264 opprsubgg 14481 unitsubm 14517 subrngpropd 14615 subrgsubm 14633 issubrg3 14646 subrgpropd 14652 lsslss 14809 lsspropdg 14859 islidlm 14907 rspcl 14919 rspssid 14920 isbasisg 15244 tgss3 15278 restbasg 15368 tgrest 15369 restopn2 15383 cnpnei 15419 cnptopresti 15438 txbas 15458 elmopn 15646 neibl 15691 dvfgg 15888 incistruhgr 16510 edgssv2en 16619 wksfval 16742 |
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