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Related theorems GIF version |
| Description: Subclass relationship for class union. Theorem 61 of [Suppes] p. 39. |
| Ref | Expression |
|---|---|
| uniss | ⊢ (A ⊆ B → ∪A ⊆ ∪B) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssel 2066 | . . . . . 6 ⊢ (A ⊆ B → (y ∈ A → y ∈ B)) | |
| 2 | 1 | anim2d 563 | . . . . 5 ⊢ (A ⊆ B → ((x ∈ y ⋀ y ∈ A) → (x ∈ y ⋀ y ∈ B))) |
| 3 | 2 | 19.22dv 1292 | . . . 4 ⊢ (A ⊆ B → (∃y(x ∈ y ⋀ y ∈ A) → ∃y(x ∈ y ⋀ y ∈ B))) |
| 4 | 3 | 19.21aiv 1288 | . . 3 ⊢ (A ⊆ B → ∀x(∃y(x ∈ y ⋀ y ∈ A) → ∃y(x ∈ y ⋀ y ∈ B))) |
| 5 | ss2ab 2119 | . . 3 ⊢ ({x∣∃y(x ∈ y ⋀ y ∈ A)} ⊆ {x∣∃y(x ∈ y ⋀ y ∈ B)} ↔ ∀x(∃y(x ∈ y ⋀ y ∈ A) → ∃y(x ∈ y ⋀ y ∈ B))) | |
| 6 | 4, 5 | sylibr 200 | . 2 ⊢ (A ⊆ B → {x∣∃y(x ∈ y ⋀ y ∈ A)} ⊆ {x∣∃y(x ∈ y ⋀ y ∈ B)}) |
| 7 | df-uni 2508 | . 2 ⊢ ∪A = {x∣∃y(x ∈ y ⋀ y ∈ A)} | |
| 8 | df-uni 2508 | . 2 ⊢ ∪B = {x∣∃y(x ∈ y ⋀ y ∈ B)} | |
| 9 | 6, 7, 8 | 3sstr4g 2105 | 1 ⊢ (A ⊆ B → ∪A ⊆ ∪B) |
| Colors of variables: wff set class |
| Syntax hints: → wi 3 ⋀ wa 223 ∀wal 956 ∈ wcel 960 ∃wex 982 {cab 1466 ⊆ wss 2050 ∪cuni 2507 |
| This theorem is referenced by: unidif 2534 intssuni2 2560 sspwuni 2764 unixpss 3264 relfld 3521 unixp0 3524 trcl 4655 rankuni 4708 cflim 4921 unirnioo 6403 tgval2t 7616 unitgt 7622 tgclt 7623 tgsst 7635 basgen2t 7638 distop 7646 fctopOLD 7647 cctop 7649 cncnplem1 7771 uniopn 7858 opnuni 7865 unirnbl 7872 dfchsup2 9293 hsupval2t 9295 hsupvalt 9296 shsupclt 9301 hsupss 9304 shsupunss 9310 shatomistic 10283 inposet 10477 fgsb 10555 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-12 970 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 |
| This theorem depends on definitions: df-bi 147 df-an 225 df-ex 983 df-sb 1174 df-clab 1467 df-cleq 1472 df-clel 1475 df-in 2054 df-ss 2056 df-uni 2508 |