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Theorem fuco11 50378
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
StepHypRef Expression
1 fuco11.f . . . . 5 (𝜑 → 𝐹(𝐶 Func 𝐷)𝐺)
21funcrcl2 50131 . . . 4 (𝜑 → 𝐶 ∈ Cat)
3 fuco11.k . . . . 5 (𝜑 → 𝐾(𝐷 Func 𝐸)𝐿)
43funcrcl2 50131 . . . 4 (𝜑 → 𝐷 ∈ Cat)
53funcrcl3 50132 . . . 4 (𝜑 → 𝐸 ∈ Cat)
6 fuco11.o . . . 4 (𝜑 → (⟨𝐶, 𝐷⟩ ∘F 𝐸) = ⟨𝑂, 𝑃⟩)
7 eqidd 2762 . . . 4 (𝜑 → ((𝐷 Func 𝐸) × (𝐶 Func 𝐷)) = ((𝐷 Func 𝐸) × (𝐶 Func 𝐷)))
82, 4, 5, 6, 7fuco1 50373 . . 3 (𝜑 → 𝑂 = ( ∘func ↾ ((𝐷 Func 𝐸) × (𝐶 Func 𝐷))))
98fveq1d 6879 . 2 (𝜑 → (𝑂‘𝑈) = (( ∘func ↾ ((𝐷 Func 𝐸) × (𝐶 Func 𝐷)))‘𝑈))
10 fuco11.u . . . 4 (𝜑 → 𝑈 = ⟨⟨𝐾, 𝐿⟩, ⟨𝐹, 𝐺⟩⟩)
117, 10, 3, 1fuco2eld 50365 . . 3 (𝜑 → 𝑈 ∈ ((𝐷 Func 𝐸) × (𝐶 Func 𝐷)))
1211fvresd 6897 . 2 (𝜑 → (( ∘func ↾ ((𝐷 Func 𝐸) × (𝐶 Func 𝐷)))‘𝑈) = ( ∘func ‘𝑈))
1310fveq2d 6881 . . 3 (𝜑 → ( ∘func ‘𝑈) = ( ∘func ‘⟨⟨𝐾, 𝐿⟩, ⟨𝐹, 𝐺⟩⟩))
14 df-ov 7415 . . 3 (⟨𝐾, 𝐿⟩ ∘func ⟨𝐹, 𝐺⟩) = ( ∘func ‘⟨⟨𝐾, 𝐿⟩, ⟨𝐹, 𝐺⟩⟩)
1513, 14eqtr4di 2814 . 2 (𝜑 → ( ∘func ‘𝑈) = (⟨𝐾, 𝐿⟩ ∘func ⟨𝐹, 𝐺⟩))
169, 12, 153eqtrd 2800 1 (𝜑 → (𝑂‘𝑈) = (⟨𝐾, 𝐿⟩ ∘func ⟨𝐹, 𝐺⟩))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1570  ⟨cop 4590   class class class wbr 5103   × cxp 5649   ↾ cres 5653  ‘cfv 6531  (class class class)co 7412  Catccat 17818   Func cfunc 18009   ∘func ccofu 18011   ∘F cfuco 50368
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 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-rep 5232  ax-sep 5249  ax-nul 5260  ax-pow 5327  ax-pr 5391  ax-un 7740
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 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-reu 3367  df-rab 3414  df-v 3453  df-sbc 3740  df-csb 3848  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-iun 4953  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-iota 6487  df-fun 6533  df-fn 6534  df-f 6535  df-f1 6536  df-fo 6537  df-f1o 6538  df-fv 6539  df-ov 7415  df-oprab 7416  df-mpo 7417  df-1st 7990  df-2nd 7991  df-func 18013  df-cofu 18015  df-fuco 50369
This theorem is used by:  fuco11a  50380  fuco11bALT  50390  precofvalALT  50420
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