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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 3478 | . . . 4 ⊢ (∃𝑦 ∈ V 𝜑 ↔ ∃𝑦𝜑) | |
| 2 | 1 | ralbii 3109 | . . 3 ⊢ (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ V 𝜑 ↔ ∀𝑥 ∈ 𝐴 ∃𝑦𝜑) |
| 3 | 2 | biimpri 231 | . 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 10560 | . 2 ⊢ (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ V 𝜑 → ∃𝑓(𝑓:𝐴⟶V ∧ ∀𝑥 ∈ 𝐴 𝜓)) |
| 8 | exsimpr 1902 | . 2 ⊢ (∃𝑓(𝑓:𝐴⟶V ∧ ∀𝑥 ∈ 𝐴 𝜓) → ∃𝑓∀𝑥 ∈ 𝐴 𝜓) | |
| 9 | 3, 7, 8 | 3syl 19 | 1 ⊢ (∀𝑥 ∈ 𝐴 ∃𝑦𝜑 → ∃𝑓∀𝑥 ∈ 𝐴 𝜓) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∃wex 1812 Ⅎwnf 1816 ∈ wcel 2145 ∀wral 3077 ∃wrex 3087 Vcvv 3451 ⟶wf 6533 ‘cfv 6537 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-rep 5232 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7749 ax-reg 9579 ax-inf2 9635 ax-ac2 10534 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-iin 4954 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-se 5605 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-isom 6546 df-riota 7375 df-ov 7421 df-om 7876 df-2nd 8000 df-frecs 8292 df-wrecs 8323 df-recs 8372 df-rdg 8411 df-en 8967 df-r1 9761 df-rank 9762 df-scott 9922 df-card 10013 df-ac 10188 |
| This theorem is used by: ac6s6 39084 |
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