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Related theorems GIF version |
| Description: ∪{x ∈ A∣φ} is an explicit representation of "the unique element in A such that φ." |
| Ref | Expression |
|---|---|
| reuuni2.1 | ⊢ (x = B → (φ ↔ ψ)) |
| Ref | Expression |
|---|---|
| reuuni2 | ⊢ ((B ∈ A ⋀ ∃!x ∈ A φ) → (ψ ↔ ∪{x ∈ A∣φ} = B)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-17 1012 | . 2 ⊢ (y ∈ B → ∀x y ∈ B) | |
| 2 | ax-17 1012 | . . 3 ⊢ (ψ → ∀xψ) | |
| 3 | 2 | a1i 8 | . 2 ⊢ (B ∈ A → (ψ → ∀xψ)) |
| 4 | reuuni2.1 | . 2 ⊢ (x = B → (φ ↔ ψ)) | |
| 5 | 1, 3, 4 | reuuni2f 2940 | 1 ⊢ ((B ∈ A ⋀ ∃!x ∈ A φ) → (ψ ↔ ∪{x ∈ A∣φ} = B)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 3 ↔ wb 153 ⋀ wa 230 ∀wal 995 = wceq 997 ∈ wcel 999 ∃!wreu 1694 {crab 1695 ∪cuni 2557 |
| This theorem is referenced by: reuuni3 2943 rabsnt 2951 f1ocnvfv3 3941 supub 4640 suplub 4641 suppr 4650 supsnALT 4652 lbinfm 6130 supxr 6163 flval2 6350 flbi 6352 uzinfmi 6488 isumclimtfi 7285 grpidinv2 8144 grpinv 8153 spwpr4OLD 8746 spwpr4aOLD 8747 pjeq2 9324 pjpj0i 9338 adjvalval 9944 cnlnadjlem5 10087 cnvbraval 10126 cdj3lem2 10446 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1003 ax-gen 1004 ax-8 1005 ax-10 1007 ax-11 1008 ax-12 1009 ax-13 1010 ax-14 1011 ax-17 1012 ax-4 1014 ax-5o 1016 ax-6o 1019 ax-9o 1164 ax-10o 1182 ax-16 1252 ax-11o 1260 ax-ext 1504 ax-sep 2758 ax-pow 2798 ax-un 2922 |
| This theorem depends on definitions: df-bi 154 df-or 231 df-an 232 df-3an 789 df-ex 1022 df-sb 1214 df-eu 1424 df-mo 1425 df-clab 1510 df-cleq 1515 df-clel 1518 df-ne 1634 df-reu 1698 df-rab 1699 df-v 1859 df-dif 2100 df-un 2101 df-in 2102 df-ss 2104 df-nul 2332 df-pw 2454 df-sn 2464 df-pr 2465 df-uni 2558 |