Theorem ifex 4585

Description: Existence of the conditional operator (inference form). (Contributed by NM, 2-Sep-2004.)

Hypotheses

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

Assertion

Ref	Expression
ifex	⊢ if(𝜑, 𝐴, 𝐵) ∈ V

Proof of Theorem ifex

Step	Hyp	Ref	Expression
1		ifex.1	. 2 ⊢ 𝐴 ∈ V
2		ifex.2	. 2 ⊢ 𝐵 ∈ V
3		ifexg 4584	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → if(𝜑, 𝐴, 𝐵) ∈ V)
4	1, 2, 3	mp2an 426	1 ⊢ if(𝜑, 𝐴, 𝐵) ∈ V

Syntax hints:   ∈ wcel 2201  Vcvv 2801  ifcif 3604

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-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2203  ax-14 2204  ax-ext 2212  ax-sep 4208  ax-pr 4301  ax-un 4532

This theorem depends on definitions:  df-bi 117  df-tru 1400  df-nf 1509  df-sb 1810  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-rex 2515  df-rab 2518  df-v 2803  df-un 3203  df-in 3205  df-ss 3212  df-if 3605  df-pw 3655  df-sn 3676  df-pr 3677  df-uni 3895

This theorem is referenced by:  elply2  15488  pw1map  16656  nnnninfex  16687