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| Mirrors > Home > MPE Home > Th. List > Mathboxes > ac6s3f | Structured version Visualization version GIF version | ||
| Description: Generalization of the Axiom of Choice to classes, with bound-variable hypothesis. (Contributed by Giovanni Mascellani, 19-Aug-2018.) |
| Ref | Expression |
|---|---|
| ac6s3f.1 | ⊢ Ⅎ𝑦𝜓 |
| ac6s3f.2 | ⊢ 𝐴 ∈ V |
| ac6s3f.3 | ⊢ (𝑦 = (𝑓‘𝑥) → (𝜑 ↔ 𝜓)) |
| Ref | Expression |
|---|---|
| ac6s3f | ⊢ (∀𝑥 ∈ 𝐴 ∃𝑦𝜑 → ∃𝑓∀𝑥 ∈ 𝐴 𝜓) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rexv 3465 | . . . 4 ⊢ (∃𝑦 ∈ V 𝜑 ↔ ∃𝑦𝜑) | |
| 2 | 1 | ralbii 3079 | . . 3 ⊢ (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ V 𝜑 ↔ ∀𝑥 ∈ 𝐴 ∃𝑦𝜑) |
| 3 | 2 | biimpri 228 | . 2 ⊢ (∀𝑥 ∈ 𝐴 ∃𝑦𝜑 → ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ V 𝜑) |
| 4 | ac6s3f.1 | . . 3 ⊢ Ⅎ𝑦𝜓 | |
| 5 | ac6s3f.2 | . . 3 ⊢ 𝐴 ∈ V | |
| 6 | ac6s3f.3 | . . 3 ⊢ (𝑦 = (𝑓‘𝑥) → (𝜑 ↔ 𝜓)) | |
| 7 | 4, 5, 6 | ac6sf 10389 | . 2 ⊢ (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ V 𝜑 → ∃𝑓(𝑓:𝐴⟶V ∧ ∀𝑥 ∈ 𝐴 𝜓)) |
| 8 | exsimpr 1870 | . 2 ⊢ (∃𝑓(𝑓:𝐴⟶V ∧ ∀𝑥 ∈ 𝐴 𝜓) → ∃𝑓∀𝑥 ∈ 𝐴 𝜓) | |
| 9 | 3, 7, 8 | 3syl 18 | 1 ⊢ (∀𝑥 ∈ 𝐴 ∃𝑦𝜑 → ∃𝑓∀𝑥 ∈ 𝐴 𝜓) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1541 ∃wex 1780 Ⅎwnf 1784 ∈ wcel 2113 ∀wral 3048 ∃wrex 3057 Vcvv 3437 ⟶wf 6484 ‘cfv 6488 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2705 ax-rep 5221 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7676 ax-reg 9487 ax-inf2 9540 ax-ac2 10363 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-nfc 2882 df-ne 2930 df-ral 3049 df-rex 3058 df-rmo 3347 df-reu 3348 df-rab 3397 df-v 3439 df-sbc 3738 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4283 df-if 4477 df-pw 4553 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4861 df-int 4900 df-iun 4945 df-iin 4946 df-br 5096 df-opab 5158 df-mpt 5177 df-tr 5203 df-id 5516 df-eprel 5521 df-po 5529 df-so 5530 df-fr 5574 df-se 5575 df-we 5576 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-pred 6255 df-ord 6316 df-on 6317 df-lim 6318 df-suc 6319 df-iota 6444 df-fun 6490 df-fn 6491 df-f 6492 df-f1 6493 df-fo 6494 df-f1o 6495 df-fv 6496 df-isom 6497 df-riota 7311 df-ov 7357 df-om 7805 df-2nd 7930 df-frecs 8219 df-wrecs 8250 df-recs 8299 df-rdg 8337 df-en 8878 df-r1 9666 df-rank 9667 df-card 9841 df-ac 10016 |
| This theorem is referenced by: ac6s6 38235 |
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