Theorem bj-xtagex 36970

Description: The product of a set and the tagging of a set is a set. (Contributed by BJ, 2-Apr-2019.)

Assertion

Ref	Expression
bj-xtagex	⊢ (𝐴 ∈ 𝑉 → (𝐵 ∈ 𝑊 → (𝐴 × tag 𝐵) ∈ V))

Proof of Theorem bj-xtagex

Step	Hyp	Ref	Expression
1		elex 3465	. . 3 ⊢ (𝐵 ∈ 𝑊 → 𝐵 ∈ V)
2		bj-tagex 36968	. . 3 ⊢ (𝐵 ∈ V ↔ tag 𝐵 ∈ V)
3	1, 2	sylib 218	. 2 ⊢ (𝐵 ∈ 𝑊 → tag 𝐵 ∈ V)
4		bj-xpexg2 36941	. 2 ⊢ (𝐴 ∈ 𝑉 → (tag 𝐵 ∈ V → (𝐴 × tag 𝐵) ∈ V))
5	3, 4	syl5 34	1 ⊢ (𝐴 ∈ 𝑉 → (𝐵 ∈ 𝑊 → (𝐴 × tag 𝐵) ∈ V))

Syntax hints:   → wi 4   ∈ wcel 2109  Vcvv 3444   × cxp 5629  tag bj-ctag 36955

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 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5229  ax-sep 5246  ax-nul 5256  ax-pow 5315  ax-pr 5382  ax-un 7691

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ral 3045  df-rex 3054  df-rab 3403  df-v 3446  df-sbc 3751  df-csb 3860  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4293  df-if 4485  df-pw 4561  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4868  df-opab 5165  df-xp 5637  df-rel 5638  df-bj-sngl 36947  df-bj-tag 36956

This theorem is referenced by:  bj-1uplex  36989  bj-2uplex  37003