Theorem infeq5i 9532

Description: Half of infeq5 9533. (Contributed by Mario Carneiro, 16-Nov-2014.)

Assertion

Ref	Expression
infeq5i	⊢ (ω ∈ V → ∃𝑥 𝑥 ⊊ ∪ 𝑥)

Proof of Theorem infeq5i

Step	Hyp	Ref	Expression
1		difexg 5268	. 2 ⊢ (ω ∈ V → (ω ∖ {∅}) ∈ V)
2		0ex 5246	. . . . 5 ⊢ ∅ ∈ V
3	2	snid 4614	. . . 4 ⊢ ∅ ∈ {∅}
4		disj4 4410	. . . . . 6 ⊢ ((ω ∩ {∅}) = ∅ ↔ ¬ (ω ∖ {∅}) ⊊ ω)
5		disj3 4405	. . . . . 6 ⊢ ((ω ∩ {∅}) = ∅ ↔ ω = (ω ∖ {∅}))
6	4, 5	bitr3i 277	. . . . 5 ⊢ (¬ (ω ∖ {∅}) ⊊ ω ↔ ω = (ω ∖ {∅}))
7		peano1 7822	. . . . . . 7 ⊢ ∅ ∈ ω
8		eleq2 2817	. . . . . . 7 ⊢ (ω = (ω ∖ {∅}) → (∅ ∈ ω ↔ ∅ ∈ (ω ∖ {∅})))
9	7, 8	mpbii 233	. . . . . 6 ⊢ (ω = (ω ∖ {∅}) → ∅ ∈ (ω ∖ {∅}))
10	9	eldifbd 3916	. . . . 5 ⊢ (ω = (ω ∖ {∅}) → ¬ ∅ ∈ {∅})
11	6, 10	sylbi 217	. . . 4 ⊢ (¬ (ω ∖ {∅}) ⊊ ω → ¬ ∅ ∈ {∅})
12	3, 11	mt4 116	. . 3 ⊢ (ω ∖ {∅}) ⊊ ω
13		unidif0 5299	. . . . 5 ⊢ ∪ (ω ∖ {∅}) = ∪ ω
14		limom 7815	. . . . . 6 ⊢ Lim ω
15		limuni 6369	. . . . . 6 ⊢ (Lim ω → ω = ∪ ω)
16	14, 15	ax-mp 5	. . . . 5 ⊢ ω = ∪ ω
17	13, 16	eqtr4i 2755	. . . 4 ⊢ ∪ (ω ∖ {∅}) = ω
18	17	psseq2i 4044	. . 3 ⊢ ((ω ∖ {∅}) ⊊ ∪ (ω ∖ {∅}) ↔ (ω ∖ {∅}) ⊊ ω)
19	12, 18	mpbir 231	. 2 ⊢ (ω ∖ {∅}) ⊊ ∪ (ω ∖ {∅})
20		psseq1 4041	. . . 4 ⊢ (𝑥 = (ω ∖ {∅}) → (𝑥 ⊊ ∪ 𝑥 ↔ (ω ∖ {∅}) ⊊ ∪ 𝑥))
21		unieq 4869	. . . . 5 ⊢ (𝑥 = (ω ∖ {∅}) → ∪ 𝑥 = ∪ (ω ∖ {∅}))
22	21	psseq2d 4047	. . . 4 ⊢ (𝑥 = (ω ∖ {∅}) → ((ω ∖ {∅}) ⊊ ∪ 𝑥 ↔ (ω ∖ {∅}) ⊊ ∪ (ω ∖ {∅})))
23	20, 22	bitrd 279	. . 3 ⊢ (𝑥 = (ω ∖ {∅}) → (𝑥 ⊊ ∪ 𝑥 ↔ (ω ∖ {∅}) ⊊ ∪ (ω ∖ {∅})))
24	23	spcegv 3552	. 2 ⊢ ((ω ∖ {∅}) ∈ V → ((ω ∖ {∅}) ⊊ ∪ (ω ∖ {∅}) → ∃𝑥 𝑥 ⊊ ∪ 𝑥))
25	1, 19, 24	mpisyl 21	1 ⊢ (ω ∈ V → ∃𝑥 𝑥 ⊊ ∪ 𝑥)

Syntax hints:  ¬ wn 3   → wi 4   = wceq 1540  ∃wex 1779   ∈ wcel 2109  Vcvv 3436   ∖ cdif 3900   ∩ cin 3902   ⊊ wpss 3904  ∅c0 4284  {csn 4577  ∪ cuni 4858  Lim wlim 6308  ωcom 7799

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-ext 2701  ax-sep 5235  ax-nul 5245  ax-pr 5371  ax-un 7671

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2721  df-clel 2803  df-ne 2926  df-ral 3045  df-rex 3054  df-rab 3395  df-v 3438  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-pss 3923  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-br 5093  df-opab 5155  df-tr 5200  df-eprel 5519  df-po 5527  df-so 5528  df-fr 5572  df-we 5574  df-ord 6310  df-on 6311  df-lim 6312  df-suc 6313  df-om 7800

This theorem is referenced by:  infeq5  9533  inf5  9541