Theorem fuco11 50653

Description: The object part of the functor composition bifunctor maps two functors to their composition. (Contributed by Zhi Wang, 30-Sep-2025.)

Hypotheses

Ref	Expression
fuco11.o	⊢ (𝜑 → (⟨𝐶, 𝐷⟩ ∘F 𝐸) = ⟨𝑂, 𝑃⟩)
fuco11.f	⊢ (𝜑 → 𝐹(𝐶 Func 𝐷)𝐺)
fuco11.k	⊢ (𝜑 → 𝐾(𝐷 Func 𝐸)𝐿)
fuco11.u	⊢ (𝜑 → 𝑈 = ⟨⟨𝐾, 𝐿⟩, ⟨𝐹, 𝐺⟩⟩)

Assertion

Ref	Expression
fuco11	⊢ (𝜑 → (𝑂‘𝑈) = (⟨𝐾, 𝐿⟩ ∘func ⟨𝐹, 𝐺⟩))

Proof of Theorem fuco11

Step	Hyp	Ref	Expression
1		fuco11.f	. . . . 5 ⊢ (𝜑 → 𝐹(𝐶 Func 𝐷)𝐺)
2	1	funcrcl2 50398	. . . 4 ⊢ (𝜑 → 𝐶 ∈ Cat)
3		fuco11.k	. . . . 5 ⊢ (𝜑 → 𝐾(𝐷 Func 𝐸)𝐿)
4	3	funcrcl2 50398	. . . 4 ⊢ (𝜑 → 𝐷 ∈ Cat)
5	3	funcrcl3 50399	. . . 4 ⊢ (𝜑 → 𝐸 ∈ Cat)
6		fuco11.o	. . . 4 ⊢ (𝜑 → (⟨𝐶, 𝐷⟩ ∘F 𝐸) = ⟨𝑂, 𝑃⟩)
7		eqidd 2764	. . . 4 ⊢ (𝜑 → ((𝐷 Func 𝐸) × (𝐶 Func 𝐷)) = ((𝐷 Func 𝐸) × (𝐶 Func 𝐷)))
8	2, 4, 5, 6, 7	fuco1 50648	. . 3 ⊢ (𝜑 → 𝑂 = ( ∘func ↾ ((𝐷 Func 𝐸) × (𝐶 Func 𝐷))))
9	8	fveq1d 6910	. 2 ⊢ (𝜑 → (𝑂‘𝑈) = (( ∘func ↾ ((𝐷 Func 𝐸) × (𝐶 Func 𝐷)))‘𝑈))
10		fuco11.u	. . . 4 ⊢ (𝜑 → 𝑈 = ⟨⟨𝐾, 𝐿⟩, ⟨𝐹, 𝐺⟩⟩)
11	7, 10, 3, 1	fuco2eld 50640	. . 3 ⊢ (𝜑 → 𝑈 ∈ ((𝐷 Func 𝐸) × (𝐶 Func 𝐷)))
12	11	fvresd 6928	. 2 ⊢ (𝜑 → (( ∘func ↾ ((𝐷 Func 𝐸) × (𝐶 Func 𝐷)))‘𝑈) = ( ∘func ‘𝑈))
13	10	fveq2d 6912	. . 3 ⊢ (𝜑 → ( ∘func ‘𝑈) = ( ∘func ‘⟨⟨𝐾, 𝐿⟩, ⟨𝐹, 𝐺⟩⟩))
14		df-ov 7446	. . 3 ⊢ (⟨𝐾, 𝐿⟩ ∘func ⟨𝐹, 𝐺⟩) = ( ∘func ‘⟨⟨𝐾, 𝐿⟩, ⟨𝐹, 𝐺⟩⟩)
15	13, 14	eqtr4di 2816	. 2 ⊢ (𝜑 → ( ∘func ‘𝑈) = (⟨𝐾, 𝐿⟩ ∘func ⟨𝐹, 𝐺⟩))
16	9, 12, 15	3eqtrd 2802	1 ⊢ (𝜑 → (𝑂‘𝑈) = (⟨𝐾, 𝐿⟩ ∘func ⟨𝐹, 𝐺⟩))

This proof depends on syntax axioms:   → wi 4   = wceq 1570  ⟨cop 4838   class class class wbr 5106   × cxp 5653   ↾ cres 5657  ‘cfv 6558  (class class class)co 7443  Catccat 17867   Func cfunc 18058   ∘_func ccofu 18060   ∘_F cfuco 50643

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-rep 5235  ax-sep 5252  ax-nul 5263  ax-pow 5331  ax-pr 5395  ax-un 7775

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-iun 4956  df-br 5107  df-opab 5171  df-mpt 5190  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-iota 6512  df-fun 6560  df-fn 6561  df-f 6562  df-f1 6563  df-fo 6564  df-f1o 6565  df-fv 6566  df-ov 7446  df-oprab 7447  df-mpo 7448  df-1st 8025  df-2nd 8026  df-func 18062  df-cofu 18064  df-fuco 50644

This theorem is used by:  fuco11a  50655  fuco11bALT  50665  precofvalALT  50708