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Related theorems GIF version |
| Description: Equivalence of restricted abstraction subclass and implication. |
| Ref | Expression |
|---|---|
| ss2rab | ⊢ ({x ∈ A∣φ} ⊆ {x ∈ A∣ψ} ↔ ∀x ∈ A (φ → ψ)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-rab 1208 | . . 3 ⊢ {x ∈ A∣φ} = {x∣(x ∈ A ∧ φ)} | |
| 2 | df-rab 1208 | . . 3 ⊢ {x ∈ A∣ψ} = {x∣(x ∈ A ∧ ψ)} | |
| 3 | 1, 2 | sseq12i 1526 | . 2 ⊢ ({x ∈ A∣φ} ⊆ {x ∈ A∣ψ} ↔ {x∣(x ∈ A ∧ φ)} ⊆ {x∣(x ∈ A ∧ ψ)}) |
| 4 | ss2ab 1551 | . 2 ⊢ ({x∣(x ∈ A ∧ φ)} ⊆ {x∣(x ∈ A ∧ ψ)} ↔ ∀x((x ∈ A ∧ φ) → (x ∈ A ∧ ψ))) | |
| 5 | df-ral 1205 | . . 3 ⊢ (∀x ∈ A (φ → ψ) ↔ ∀x(x ∈ A → (φ → ψ))) | |
| 6 | imdistan 339 | . . . 4 ⊢ ((x ∈ A → (φ → ψ)) ↔ ((x ∈ A ∧ φ) → (x ∈ A ∧ ψ))) | |
| 7 | 6 | bial 695 | . . 3 ⊢ (∀x(x ∈ A → (φ → ψ)) ↔ ∀x((x ∈ A ∧ φ) → (x ∈ A ∧ ψ))) |
| 8 | 5, 7 | bitr2 152 | . 2 ⊢ (∀x((x ∈ A ∧ φ) → (x ∈ A ∧ ψ)) ↔ ∀x ∈ A (φ → ψ)) |
| 9 | 3, 4, 8 | 3bitr 155 | 1 ⊢ ({x ∈ A∣φ} ⊆ {x ∈ A∣ψ} ↔ ∀x ∈ A (φ → ψ)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 ↔ wb 127 ∧ wa 196 ∀wal 672 {cab 1090 ∈ wcel 1092 ∀wral 1201 {crab 1204 ⊆ wss 1487 |
| This theorem is referenced by: ss2rabi 1554 rankr1id 3539 scottex 3541 ondomon 3662 uzwo3lem1 4614 uzwo3lem2 4615 occont 5168 hsupss 5310 spanss 5319 chpssat 5756 |
| 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-ral 1205 df-rab 1208 df-in 1491 df-ss 1492 |