Theorem bj-omex2 16986

Description: Using bounded set induction and the strong axiom of infinity, ω is a set, that is, we recover ax-infvn 16950 (see bj-2inf 16947 for the equivalence of the latter with bj-omex 16951). (Contributed by BJ, 8-Dec-2019.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
bj-omex2	⊢ ω ∈ V

Proof of Theorem bj-omex2

Dummy variables 𝑥 𝑦 𝑎 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ax-inf2 16985	. . 3 ⊢ ∃𝑎∀𝑥(𝑥 ∈ 𝑎 ↔ (𝑥 = ∅ ∨ ∃𝑦 ∈ 𝑎 𝑥 = suc 𝑦))
2		vex 2824	. . . 4 ⊢ 𝑎 ∈ V
3		bdcv 16857	. . . . 5 ⊢ BOUNDED 𝑎
4	3	bj-inf2vn 16983	. . . 4 ⊢ (𝑎 ∈ V → (∀𝑥(𝑥 ∈ 𝑎 ↔ (𝑥 = ∅ ∨ ∃𝑦 ∈ 𝑎 𝑥 = suc 𝑦)) → 𝑎 = ω))
5	2, 4	ax-mp 5	. . 3 ⊢ (∀𝑥(𝑥 ∈ 𝑎 ↔ (𝑥 = ∅ ∨ ∃𝑦 ∈ 𝑎 𝑥 = suc 𝑦)) → 𝑎 = ω)
6	1, 5	eximii 1655	. 2 ⊢ ∃𝑎 𝑎 = ω
7	6	issetri 2831	1 ⊢ ω ∈ V

Syntax hints:   → wi 4   ↔ wb 105   ∨ wo 720  ∀wal 1400   = wceq 1402   ∈ wcel 2209  ∃wrex 2529  Vcvv 2821  ∅c0 3520  suc csuc 4508  ωcom 4735

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-nul 4257  ax-pr 4344  ax-un 4576  ax-bd0 16822  ax-bdim 16823  ax-bdor 16825  ax-bdex 16828  ax-bdeq 16829  ax-bdel 16830  ax-bdsep 16893  ax-bdsetind 16977  ax-inf2 16985

This theorem depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-sn 3714  df-pr 3715  df-uni 3934  df-int 3969  df-suc 4514  df-iom 4736  df-bdc 16850  df-bj-ind 16936

This theorem is referenced by: (None)