Theorem ifexd 4581

Description: Existence of the conditional operator (deduction form). (Contributed by SN, 26-Jul-2024.)

Hypotheses

Ref	Expression
ifexd.1	⊢ (𝜑 → 𝐴 ∈ 𝑉)
ifexd.2	⊢ (𝜑 → 𝐵 ∈ 𝑊)

Assertion

Ref	Expression
ifexd	⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) ∈ V)

Proof of Theorem ifexd

Step	Hyp	Ref	Expression
1		ifexd.1	. . 3 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
2	1	elexd 3485	. 2 ⊢ (𝜑 → 𝐴 ∈ V)
3		ifexd.2	. . 3 ⊢ (𝜑 → 𝐵 ∈ 𝑊)
4	3	elexd 3485	. 2 ⊢ (𝜑 → 𝐵 ∈ V)
5	2, 4	ifcld 4579	1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) ∈ V)

Syntax hints:   → wi 4   ∈ wcel 2099  Vcvv 3462  ifcif 4533

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-ext 2697

This theorem depends on definitions:  df-bi 206  df-an 395  df-or 846  df-tru 1537  df-ex 1775  df-sb 2061  df-clab 2704  df-cleq 2718  df-clel 2803  df-v 3464  df-if 4534

This theorem is referenced by:  ifexg  4582  evlslem3  22095  mhpsclcl  22141  psgnfzto1stlem  32978  prjspnfv01  42278  prjspner01  42279  prjspner1  42280  sge0val  45987  hsphoival  46200  hspmbllem2  46248