Theorem bj-snfromadj 37541

Description: Singleton from adjunction and empty set. (Contributed by BJ, 19-Jan-2025.) (Proof modification is discouraged.)

Assertion

Ref	Expression
bj-snfromadj	⊢ {𝑥} ∈ V

Proof of Theorem bj-snfromadj

Step	Hyp	Ref	Expression
1		0un 4353	. 2 ⊢ (∅ ∪ {𝑥}) = {𝑥}
2		0ex 5262	. . 3 ⊢ ∅ ∈ V
3		bj-adjg1 37540	. . 3 ⊢ (∅ ∈ V → (∅ ∪ {𝑥}) ∈ V)
4	2, 3	ax-mp 5	. 2 ⊢ (∅ ∪ {𝑥}) ∈ V
5	1, 4	eqeltrri 2862	1 ⊢ {𝑥} ∈ V

Syntax hints:   ∈ wcel 2145  Vcvv 3457   ∪ cun 3905  ∅c0 4288  {csn 4585

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1818  ax-4 1832  ax-5 1933  ax-6 1990  ax-7 2031  ax-8 2147  ax-9 2155  ax-12 2215  ax-ext 2737  ax-nul 5261  ax-bj-adj 37539

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-tru 1566  df-fal 1576  df-ex 1803  df-sb 2094  df-clab 2744  df-cleq 2757  df-clel 2840  df-v 3459  df-dif 3910  df-un 3912  df-nul 4289  df-sn 4586

This theorem is referenced by:  bj-prfromadj  37542