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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 |
|---|---|
| sseq1d | ⊢ (φ → (A ⊆ C ↔ B ⊆ C)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sseq1d.1 | . 2 ⊢ (φ → A = B) | |
| 2 | sseq1 1521 | . 2 ⊢ (A = B → (A ⊆ C ↔ B ⊆ C)) | |
| 3 | 1, 2 | syl 12 | 1 ⊢ (φ → (A ⊆ C ↔ B ⊆ C)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 ↔ wb 127 = wceq 1091 ⊆ wss 1487 |
| This theorem is referenced by: sseq12d 1529 eqsstrd 1534 snssg 1850 ssiun2s 2020 treq 2047 funimass1 2712 feq1 2748 tfrlem8 2956 oaordi 3148 oaword2 3155 oawordeulem 3156 nnmordi 3188 ereq 3206 map0e 3266 sbthlem5 3353 inf3lema 3460 inf3lemd 3463 trcl 3489 r1val1 3502 rankr1 3518 scottex 3541 scott0 3542 scottexs 3543 scott0s 3544 karden 3551 fodomb 3615 cardaleph 3690 cfub 3703 cflecard 3707 cfle 3708 infmap2lem2 4952 ocsh 5164 hsupval2t 5301 chsupid 5312 chsupsn 5313 shlubt 5355 shmod 5364 chsscon3t 5417 chsscon2t 5419 spansncv 5542 pj3 5660 mdsymlem5 5780 sumdmd 5787 |
| 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 |