Theorem opnzi 5479

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 5478	. 2 ⊢ (⟨𝐴, 𝐵⟩ ≠ ∅ ↔ (𝐴 ∈ V ∧ 𝐵 ∈ V))
4	1, 2, 3	mpbir2an 711	1 ⊢ ⟨𝐴, 𝐵⟩ ≠ ∅

Syntax hints:   ∈ wcel 2108   ≠ wne 2940  Vcvv 3480  ∅c0 4333  ⟨cop 4632

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 2007  ax-8 2110  ax-9 2118  ax-ext 2708  ax-sep 5296  ax-nul 5306  ax-pr 5432

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2065  df-clab 2715  df-cleq 2729  df-clel 2816  df-ne 2941  df-v 3482  df-dif 3954  df-un 3956  df-ss 3968  df-nul 4334  df-if 4526  df-sn 4627  df-pr 4629  df-op 4633

This theorem is referenced by:  opelopabsb  5535  0nelopab  5572  0nelxp  5719  unixp0  6303  funopsn  7168  cnfldfun  21378  cnfldfunOLD  21391  fmlaomn0  35395  finxpreclem2  37391  finxp0  37392  finxpreclem6  37397