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Related theorems GIF version |
| Description: An equality deduction for the subclass relationship. |
| 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 1522 | . 2 ⊢ (A = B → (C ⊆ A ↔ C ⊆ B)) | |
| 3 | 1, 2 | syl 12 | 1 ⊢ (φ → (C ⊆ A ↔ C ⊆ B)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 ↔ wb 127 = wceq 1091 ⊆ wss 1487 |
| This theorem is referenced by: sseq12d 1529 sseqtrd 1536 funimass2 2713 fnssres 2734 fco 2760 f1ores 2813 tz6.12-2 2845 isofrlem 2939 oaordi 3148 oawordeulem 3156 oaass 3163 oen0 3165 nnmordi 3188 pw2en 3348 sbthlem2 3350 sbth 3359 ssenen 3399 phplem3 3405 pssnn 3428 ssfi 3430 fiint 3445 trcl 3489 r1tr 3498 rankr1id 3539 kmlem5 3584 alephordlem2 3678 alephordi 3679 alephgeom 3687 cardaleph 3690 cardalephex 3691 cflim 3704 hsupunss 5314 spanss2 5315 orthin 5371 chsscon3t 5417 chsscon1t 5418 h1datomt 5484 pjoml5 5498 osumlem8 5537 spansncvt 5543 pjcjt2 5580 pjopytht 5662 stjt 5676 atcvat4 5775 mdsymlem2 5777 mdsymlem3 5778 mdsymlem8 5783 mdsym 5784 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-16 922 ax-17 925 ax-ext 1074 |
| This theorem depends on definitions: df-bi 128 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-in 1491 df-ss 1492 |