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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 11434 swrdnd 11446 swrd0g 11447 summodclem2 12167 summodc 12168 zsumdc 12169 fsum3cvg3 12181 prodmodclem2 12362 prodmodc 12363 zproddc 12364 ennnfoneleminc 13353 tgval 13667 releqgg 14074 eqgex 14075 eqgfval 14076 prdsval 14224 opprsubgg 14441 unitsubm 14477 subrngpropd 14575 subrgsubm 14593 issubrg3 14606 subrgpropd 14612 lsslss 14769 lsspropdg 14819 islidlm 14867 rspcl 14879 rspssid 14880 isbasisg 15197 tgss3 15231 restbasg 15321 tgrest 15322 restopn2 15336 cnpnei 15372 cnptopresti 15391 txbas 15411 elmopn 15599 neibl 15644 dvfgg 15841 incistruhgr 16453 edgssv2en 16562 wksfval 16685 |
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