Theorem fuco2eld 50074

Description: Equivalence of product functor. (Contributed by Zhi Wang, 29-Sep-2025.)

Hypotheses

Ref	Expression
fuco2eld.w	⊢ (𝜑 → 𝑊 = (𝑆 × 𝑅))
fuco2eld.u	⊢ (𝜑 → 𝑈 = ⟨⟨𝐾, 𝐿⟩, ⟨𝐹, 𝐺⟩⟩)
fuco2eld.k	⊢ (𝜑 → 𝐾𝑆𝐿)
fuco2eld.f	⊢ (𝜑 → 𝐹𝑅𝐺)

Assertion

Ref	Expression
fuco2eld	⊢ (𝜑 → 𝑈 ∈ 𝑊)

Proof of Theorem fuco2eld

Step	Hyp	Ref	Expression
1		fuco2eld.k	. . 3 ⊢ (𝜑 → 𝐾𝑆𝐿)
2		fuco2eld.f	. . 3 ⊢ (𝜑 → 𝐹𝑅𝐺)
3		fuco2el 50073	. . 3 ⊢ (⟨⟨𝐾, 𝐿⟩, ⟨𝐹, 𝐺⟩⟩ ∈ (𝑆 × 𝑅) ↔ (𝐾𝑆𝐿 ∧ 𝐹𝑅𝐺))
4	1, 2, 3	sylanbrc 594	. 2 ⊢ (𝜑 → ⟨⟨𝐾, 𝐿⟩, ⟨𝐹, 𝐺⟩⟩ ∈ (𝑆 × 𝑅))
5		fuco2eld.u	. 2 ⊢ (𝜑 → 𝑈 = ⟨⟨𝐾, 𝐿⟩, ⟨𝐹, 𝐺⟩⟩)
6		fuco2eld.w	. 2 ⊢ (𝜑 → 𝑊 = (𝑆 × 𝑅))
7	4, 5, 6	3eltr4d 2878	1 ⊢ (𝜑 → 𝑈 ∈ 𝑊)

Syntax hints:   → wi 4   = wceq 1570   ∈ wcel 2143  ⟨cop 4596   class class class wbr 5110   × cxp 5661

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735  ax-sep 5258  ax-pr 5406

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4489  df-sn 4591  df-pr 4593  df-op 4597  df-br 5111  df-opab 5175  df-xp 5669

This theorem is referenced by:  fuco11  50087  fuco11cl  50088  fuco21  50097