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Related theorems GIF version |
| Description: Inference of abstraction subclass from implication. |
| Ref | Expression |
|---|---|
| ss2abi.1 | ⊢ (φ → ψ) |
| Ref | Expression |
|---|---|
| ss2abi | ⊢ {x∣φ} ⊆ {x∣ψ} |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ss2ab 1551 | . 2 ⊢ ({x∣φ} ⊆ {x∣ψ} ↔ ∀x(φ → ψ)) | |
| 2 | ss2abi.1 | . 2 ⊢ (φ → ψ) | |
| 3 | 1, 2 | mpgbir 686 | 1 ⊢ {x∣φ} ⊆ {x∣ψ} |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 {cab 1090 ⊆ wss 1487 |
| This theorem is referenced by: ssab 1555 moabex 1868 opabss 2100 dmexg 2551 rnexg 2569 dmco 2570 imassrn 2611 tz6.12-2 2845 fvclss 2907 abrexexlem1 2910 abrexex 2912 mapex 3261 pw2en 3348 aceq3lem 3555 aceq5lem4 3561 aceq6b 3565 hta 3619 cflim 3704 cfsuc 3709 cfom 3710 npex 3885 nnind 4434 infxpidmlem9 4941 infmap2lem2 4952 infmap2 4953 gch-kn 4957 shex 5115 |
| 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 |