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Mirrors > Home > MPE Home > Th. List > Mathboxes > bnd2d | Structured version Visualization version GIF version |
Description: Deduction form of bnd2 9931. (Contributed by Emmett Weisz, 19-Jan-2021.) |
Ref | Expression |
---|---|
bnd2d.1 | ⊢ (𝜑 → 𝐴 ∈ V) |
bnd2d.2 | ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝜓) |
Ref | Expression |
---|---|
bnd2d | ⊢ (𝜑 → ∃𝑧(𝑧 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝑧 𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bnd2d.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ V) | |
2 | bnd2d.2 | . 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝜓) | |
3 | raleq 3321 | . . . 4 ⊢ (𝐴 = if(𝐴 ∈ V, 𝐴, ∅) → (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝜓 ↔ ∀𝑥 ∈ if (𝐴 ∈ V, 𝐴, ∅)∃𝑦 ∈ 𝐵 𝜓)) | |
4 | raleq 3321 | . . . . . 6 ⊢ (𝐴 = if(𝐴 ∈ V, 𝐴, ∅) → (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝑧 𝜓 ↔ ∀𝑥 ∈ if (𝐴 ∈ V, 𝐴, ∅)∃𝑦 ∈ 𝑧 𝜓)) | |
5 | 4 | anbi2d 630 | . . . . 5 ⊢ (𝐴 = if(𝐴 ∈ V, 𝐴, ∅) → ((𝑧 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝑧 𝜓) ↔ (𝑧 ⊆ 𝐵 ∧ ∀𝑥 ∈ if (𝐴 ∈ V, 𝐴, ∅)∃𝑦 ∈ 𝑧 𝜓))) |
6 | 5 | exbidv 1919 | . . . 4 ⊢ (𝐴 = if(𝐴 ∈ V, 𝐴, ∅) → (∃𝑧(𝑧 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝑧 𝜓) ↔ ∃𝑧(𝑧 ⊆ 𝐵 ∧ ∀𝑥 ∈ if (𝐴 ∈ V, 𝐴, ∅)∃𝑦 ∈ 𝑧 𝜓))) |
7 | 3, 6 | imbi12d 344 | . . 3 ⊢ (𝐴 = if(𝐴 ∈ V, 𝐴, ∅) → ((∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝜓 → ∃𝑧(𝑧 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝑧 𝜓)) ↔ (∀𝑥 ∈ if (𝐴 ∈ V, 𝐴, ∅)∃𝑦 ∈ 𝐵 𝜓 → ∃𝑧(𝑧 ⊆ 𝐵 ∧ ∀𝑥 ∈ if (𝐴 ∈ V, 𝐴, ∅)∃𝑦 ∈ 𝑧 𝜓)))) |
8 | 0ex 5313 | . . . . 5 ⊢ ∅ ∈ V | |
9 | 8 | elimel 4600 | . . . 4 ⊢ if(𝐴 ∈ V, 𝐴, ∅) ∈ V |
10 | 9 | bnd2 9931 | . . 3 ⊢ (∀𝑥 ∈ if (𝐴 ∈ V, 𝐴, ∅)∃𝑦 ∈ 𝐵 𝜓 → ∃𝑧(𝑧 ⊆ 𝐵 ∧ ∀𝑥 ∈ if (𝐴 ∈ V, 𝐴, ∅)∃𝑦 ∈ 𝑧 𝜓)) |
11 | 7, 10 | dedth 4589 | . 2 ⊢ (𝐴 ∈ V → (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝜓 → ∃𝑧(𝑧 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝑧 𝜓))) |
12 | 1, 2, 11 | sylc 65 | 1 ⊢ (𝜑 → ∃𝑧(𝑧 ⊆ 𝐵 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝑧 𝜓)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 = wceq 1537 ∃wex 1776 ∈ wcel 2106 ∀wral 3059 ∃wrex 3068 Vcvv 3478 ⊆ wss 3963 ∅c0 4339 ifcif 4531 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-rep 5285 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-reg 9630 ax-inf2 9679 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-ral 3060 df-rex 3069 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-int 4952 df-iun 4998 df-iin 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-lim 6391 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-ov 7434 df-om 7888 df-2nd 8014 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-rdg 8449 df-r1 9802 df-rank 9803 |
This theorem is referenced by: setrec1lem3 48920 |
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