Theorem funcrcl3 48774

Description: Reverse closure for a functor. (Contributed by Zhi Wang, 17-Sep-2025.)

Hypothesis

Ref	Expression
funcrcl2.f	⊢ (𝜑 → 𝐹(𝐷 Func 𝐸)𝐺)

Assertion

Ref	Expression
funcrcl3	⊢ (𝜑 → 𝐸 ∈ Cat)

Proof of Theorem funcrcl3

Step	Hyp	Ref	Expression
1		funcrcl2.f	. . 3 ⊢ (𝜑 → 𝐹(𝐷 Func 𝐸)𝐺)
2		df-br 5169	. . . 4 ⊢ (𝐹(𝐷 Func 𝐸)𝐺 ↔ ⟨𝐹, 𝐺⟩ ∈ (𝐷 Func 𝐸))
3	2	biimpi 216	. . 3 ⊢ (𝐹(𝐷 Func 𝐸)𝐺 → ⟨𝐹, 𝐺⟩ ∈ (𝐷 Func 𝐸))
4		funcrcl 17948	. . 3 ⊢ (⟨𝐹, 𝐺⟩ ∈ (𝐷 Func 𝐸) → (𝐷 ∈ Cat ∧ 𝐸 ∈ Cat))
5	1, 3, 4	3syl 18	. 2 ⊢ (𝜑 → (𝐷 ∈ Cat ∧ 𝐸 ∈ Cat))
6	5	simprd 495	1 ⊢ (𝜑 → 𝐸 ∈ Cat)

Syntax hints:   → wi 4   ∧ wa 395   ∈ wcel 2108  ⟨cop 4655   class class class wbr 5168  (class class class)co 7452  Catccat 17743   Func cfunc 17939

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-sep 5319  ax-nul 5326  ax-pr 5449

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2543  df-eu 2572  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ral 3068  df-rex 3077  df-rab 3445  df-v 3491  df-dif 3980  df-un 3982  df-ss 3994  df-nul 4354  df-if 4550  df-sn 4650  df-pr 4652  df-op 4656  df-uni 4934  df-br 5169  df-opab 5231  df-xp 5708  df-dm 5712  df-iota 6529  df-fv 6585  df-ov 7455  df-oprab 7456  df-mpo 7457  df-func 17943

This theorem is referenced by:  upciclem2  48777  upciclem3  48778  upeu2  48782