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Theorem onfrALTlem3VD 45313
Description: Virtual deduction proof of onfrALTlem3 44971. The following User's Proof is a Virtual Deduction proof completed automatically by the tools program completeusersproof.cmd, which invokes Mel L. O'Cat's mmj2 and Norm Megill's Metamath Proof Assistant. onfrALTlem3 44971 is onfrALTlem3VD 45313 without virtual deductions and was automatically derived from onfrALTlem3VD 45313.
1:: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ▶   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   )
2:: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   )
3:2: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   𝑥𝑎   )
4:1: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ▶   𝑎 On   )
5:3,4: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   𝑥 ∈ On   )
6:5: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   Ord 𝑥   )
7:6: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶    E We 𝑥   )
8:: (𝑎𝑥) ⊆ 𝑥
9:7,8: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶    E We (𝑎𝑥)   )
10:9: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶    E Fr (𝑎𝑥)   )
11:10: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   𝑏((𝑏 ⊆ (𝑎𝑥) ∧ 𝑏 ∅) → ∃𝑦𝑏(𝑏𝑦) = ∅)   )
12:: 𝑥 ∈ V
13:12,8: (𝑎𝑥) ∈ V
14:13,11: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   [(𝑎𝑥) / 𝑏]((𝑏 ⊆ (𝑎 𝑥) ∧ 𝑏 ≠ ∅) → ∃𝑦𝑏(𝑏𝑦) = ∅)   )
15:: ([(𝑎𝑥) / 𝑏]((𝑏 ⊆ (𝑎 𝑥) ∧ 𝑏 ≠ ∅) → ∃𝑦𝑏(𝑏𝑦) = ∅) ↔ (((𝑎 𝑥) ⊆ (𝑎𝑥) ∧ (𝑎𝑥) ≠ ∅) → ∃𝑦 ∈ (𝑎𝑥)( (𝑎𝑥) ∩ 𝑦) = ∅))
16:14,15: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   (((𝑎𝑥) ⊆ (𝑎𝑥) ∧ ( 𝑎𝑥) ≠ ∅) → ∃𝑦 ∈ (𝑎𝑥)((𝑎𝑥) ∩ 𝑦) = ∅)   )
17:: (𝑎𝑥) ⊆ (𝑎𝑥)
18:2: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   ¬ (𝑎𝑥) = ∅   )
19:18: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   (𝑎𝑥) ≠ ∅   )
20:17,19: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   ((𝑎𝑥) ⊆ (𝑎𝑥) ∧ (𝑎 𝑥) ≠ ∅)   )
qed:16,20: (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥 𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   𝑦 ∈ (𝑎𝑥)((𝑎𝑥) ∩ 𝑦 ) = ∅   )
(Contributed by Alan Sare, 22-Jul-2012.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
onfrALTlem3VD (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   𝑦 ∈ (𝑎𝑥)((𝑎𝑥) ∩ 𝑦) = ∅   )
Distinct variable groups:   𝑦,𝑎   𝑥,𝑦

Proof of Theorem onfrALTlem3VD
Dummy variable 𝑏 is distinct from all other variables.
StepHypRef Expression
1 vex 3433 . . . . 5 𝑥 ∈ V
2 inss2 4178 . . . . 5 (𝑎𝑥) ⊆ 𝑥
31, 2ssexi 5263 . . . 4 (𝑎𝑥) ∈ V
4 idn2 45040 . . . . . . . . . . 11 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   )
5 simpl 482 . . . . . . . . . . 11 ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → 𝑥𝑎)
64, 5e2 45058 . . . . . . . . . 10 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   𝑥𝑎   )
7 idn1 45001 . . . . . . . . . . 11 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ▶   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   )
8 simpl 482 . . . . . . . . . . 11 ((𝑎 ⊆ On ∧ 𝑎 ≠ ∅) → 𝑎 ⊆ On)
97, 8e1a 45054 . . . . . . . . . 10 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ▶   𝑎 ⊆ On   )
10 ssel 3915 . . . . . . . . . . 11 (𝑎 ⊆ On → (𝑥𝑎𝑥 ∈ On))
1110com12 32 . . . . . . . . . 10 (𝑥𝑎 → (𝑎 ⊆ On → 𝑥 ∈ On))
126, 9, 11e21 45156 . . . . . . . . 9 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   𝑥 ∈ On   )
13 eloni 6333 . . . . . . . . 9 (𝑥 ∈ On → Ord 𝑥)
1412, 13e2 45058 . . . . . . . 8 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   Ord 𝑥   )
15 ordwe 6336 . . . . . . . 8 (Ord 𝑥 → E We 𝑥)
1614, 15e2 45058 . . . . . . 7 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶    E We 𝑥   )
17 wess 5617 . . . . . . . 8 ((𝑎𝑥) ⊆ 𝑥 → ( E We 𝑥 → E We (𝑎𝑥)))
1817com12 32 . . . . . . 7 ( E We 𝑥 → ((𝑎𝑥) ⊆ 𝑥 → E We (𝑎𝑥)))
1916, 2, 18e20 45153 . . . . . 6 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶    E We (𝑎𝑥)   )
20 wefr 5621 . . . . . 6 ( E We (𝑎𝑥) → E Fr (𝑎𝑥))
2119, 20e2 45058 . . . . 5 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶    E Fr (𝑎𝑥)   )
22 dfepfr 5615 . . . . . 6 ( E Fr (𝑎𝑥) ↔ ∀𝑏((𝑏 ⊆ (𝑎𝑥) ∧ 𝑏 ≠ ∅) → ∃𝑦𝑏 (𝑏𝑦) = ∅))
2322biimpi 216 . . . . 5 ( E Fr (𝑎𝑥) → ∀𝑏((𝑏 ⊆ (𝑎𝑥) ∧ 𝑏 ≠ ∅) → ∃𝑦𝑏 (𝑏𝑦) = ∅))
2421, 23e2 45058 . . . 4 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   𝑏((𝑏 ⊆ (𝑎𝑥) ∧ 𝑏 ≠ ∅) → ∃𝑦𝑏 (𝑏𝑦) = ∅)   )
25 spsbc 3741 . . . 4 ((𝑎𝑥) ∈ V → (∀𝑏((𝑏 ⊆ (𝑎𝑥) ∧ 𝑏 ≠ ∅) → ∃𝑦𝑏 (𝑏𝑦) = ∅) → [(𝑎𝑥) / 𝑏]((𝑏 ⊆ (𝑎𝑥) ∧ 𝑏 ≠ ∅) → ∃𝑦𝑏 (𝑏𝑦) = ∅)))
263, 24, 25e02 45124 . . 3 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   [(𝑎𝑥) / 𝑏]((𝑏 ⊆ (𝑎𝑥) ∧ 𝑏 ≠ ∅) → ∃𝑦𝑏 (𝑏𝑦) = ∅)   )
27 onfrALTlem5 44969 . . 3 ([(𝑎𝑥) / 𝑏]((𝑏 ⊆ (𝑎𝑥) ∧ 𝑏 ≠ ∅) → ∃𝑦𝑏 (𝑏𝑦) = ∅) ↔ (((𝑎𝑥) ⊆ (𝑎𝑥) ∧ (𝑎𝑥) ≠ ∅) → ∃𝑦 ∈ (𝑎𝑥)((𝑎𝑥) ∩ 𝑦) = ∅))
2826, 27e2bi 45059 . 2 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   (((𝑎𝑥) ⊆ (𝑎𝑥) ∧ (𝑎𝑥) ≠ ∅) → ∃𝑦 ∈ (𝑎𝑥)((𝑎𝑥) ∩ 𝑦) = ∅)   )
29 ssid 3944 . . 3 (𝑎𝑥) ⊆ (𝑎𝑥)
30 simpr 484 . . . . 5 ((𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅) → ¬ (𝑎𝑥) = ∅)
314, 30e2 45058 . . . 4 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶    ¬ (𝑎𝑥) = ∅   )
32 df-ne 2933 . . . . 5 ((𝑎𝑥) ≠ ∅ ↔ ¬ (𝑎𝑥) = ∅)
3332biimpri 228 . . . 4 (¬ (𝑎𝑥) = ∅ → (𝑎𝑥) ≠ ∅)
3431, 33e2 45058 . . 3 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   (𝑎𝑥) ≠ ∅   )
35 pm3.2 469 . . 3 ((𝑎𝑥) ⊆ (𝑎𝑥) → ((𝑎𝑥) ≠ ∅ → ((𝑎𝑥) ⊆ (𝑎𝑥) ∧ (𝑎𝑥) ≠ ∅)))
3629, 34, 35e02 45124 . 2 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   ((𝑎𝑥) ⊆ (𝑎𝑥) ∧ (𝑎𝑥) ≠ ∅)   )
37 id 22 . 2 ((((𝑎𝑥) ⊆ (𝑎𝑥) ∧ (𝑎𝑥) ≠ ∅) → ∃𝑦 ∈ (𝑎𝑥)((𝑎𝑥) ∩ 𝑦) = ∅) → (((𝑎𝑥) ⊆ (𝑎𝑥) ∧ (𝑎𝑥) ≠ ∅) → ∃𝑦 ∈ (𝑎𝑥)((𝑎𝑥) ∩ 𝑦) = ∅))
3828, 36, 37e22 45098 1 (   (𝑎 ⊆ On ∧ 𝑎 ≠ ∅)   ,   (𝑥𝑎 ∧ ¬ (𝑎𝑥) = ∅)   ▶   𝑦 ∈ (𝑎𝑥)((𝑎𝑥) ∩ 𝑦) = ∅   )
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 395  wal 1540   = wceq 1542  wcel 2114  wne 2932  wrex 3061  Vcvv 3429  [wsbc 3728  cin 3888  wss 3889  c0 4273   E cep 5530   Fr wfr 5581   We wwe 5583  Ord word 6322  Oncon0 6323  (   wvd2 45004
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-sep 5231  ax-pr 5375
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-sbc 3729  df-csb 3838  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-tr 5193  df-eprel 5531  df-po 5539  df-so 5540  df-fr 5584  df-we 5586  df-ord 6326  df-on 6327  df-vd1 44997  df-vd2 45005
This theorem is referenced by:  onfrALTlem2VD  45315
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