Theorem opnzi 5412

Description: An ordered pair is nonempty if the arguments are sets. (Contributed by Mario Carneiro, 26-Apr-2015.)

Hypotheses

Ref	Expression
opth1.1	⊢ 𝐴 ∈ V
opth1.2	⊢ 𝐵 ∈ V

Assertion

Ref	Expression
opnzi	⊢ ⟨𝐴, 𝐵⟩ ≠ ∅

Proof of Theorem opnzi

Step	Hyp	Ref	Expression
1		opth1.1	. 2 ⊢ 𝐴 ∈ V
2		opth1.2	. 2 ⊢ 𝐵 ∈ V
3		opnz 5411	. 2 ⊢ (⟨𝐴, 𝐵⟩ ≠ ∅ ↔ (𝐴 ∈ V ∧ 𝐵 ∈ V))
4	1, 2, 3	mpbir2an 711	1 ⊢ ⟨𝐴, 𝐵⟩ ≠ ∅

Syntax hints:   ∈ wcel 2111   ≠ wne 2928  Vcvv 3436  ∅c0 4280  ⟨cop 4579

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-ext 2703  ax-sep 5232  ax-nul 5242  ax-pr 5368

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2068  df-clab 2710  df-cleq 2723  df-clel 2806  df-ne 2929  df-v 3438  df-dif 3900  df-un 3902  df-ss 3914  df-nul 4281  df-if 4473  df-sn 4574  df-pr 4576  df-op 4580

This theorem is referenced by:  opelopabsb  5468  0nelopab  5503  0nelxp  5648  unixp0  6230  funopsn  7081  cnfldfun  21305  cnfldfunOLD  21318  fmlaomn0  35434  finxpreclem2  37434  finxp0  37435  finxpreclem6  37440