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Theorem fucco 17934
Description: Value of the composition of natural transformations. (Contributed by Mario Carneiro, 6-Jan-2017.)
Hypotheses
Ref Expression
fucco.q 𝑄 = (𝐶 FuncCat 𝐷)
fucco.n 𝑁 = (𝐶 Nat 𝐷)
fucco.a 𝐴 = (Base‘𝐶)
fucco.o · = (comp‘𝐷)
fucco.x = (comp‘𝑄)
fucco.f (𝜑𝑅 ∈ (𝐹𝑁𝐺))
fucco.g (𝜑𝑆 ∈ (𝐺𝑁𝐻))
Assertion
Ref Expression
fucco (𝜑 → (𝑆(⟨𝐹, 𝐺 𝐻)𝑅) = (𝑥𝐴 ↦ ((𝑆𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑅𝑥))))
Distinct variable groups:   𝑥,𝐴   𝜑,𝑥   𝑥,𝑅   𝑥,𝑆   𝑥,𝐶   𝑥,𝐷   𝑥, ·   𝑥,𝐹   𝑥,𝐺   𝑥,𝐻
Allowed substitution hints:   𝑄(𝑥)   (𝑥)   𝑁(𝑥)

Proof of Theorem fucco
Dummy variables 𝑎 𝑏 𝑓 𝑔 𝑣 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fucco.q . . . 4 𝑄 = (𝐶 FuncCat 𝐷)
2 eqid 2730 . . . 4 (𝐶 Func 𝐷) = (𝐶 Func 𝐷)
3 fucco.n . . . 4 𝑁 = (𝐶 Nat 𝐷)
4 fucco.a . . . 4 𝐴 = (Base‘𝐶)
5 fucco.o . . . 4 · = (comp‘𝐷)
6 fucco.f . . . . . . . 8 (𝜑𝑅 ∈ (𝐹𝑁𝐺))
73natrcl 17922 . . . . . . . 8 (𝑅 ∈ (𝐹𝑁𝐺) → (𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝐺 ∈ (𝐶 Func 𝐷)))
86, 7syl 17 . . . . . . 7 (𝜑 → (𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝐺 ∈ (𝐶 Func 𝐷)))
98simpld 494 . . . . . 6 (𝜑𝐹 ∈ (𝐶 Func 𝐷))
10 funcrcl 17832 . . . . . 6 (𝐹 ∈ (𝐶 Func 𝐷) → (𝐶 ∈ Cat ∧ 𝐷 ∈ Cat))
119, 10syl 17 . . . . 5 (𝜑 → (𝐶 ∈ Cat ∧ 𝐷 ∈ Cat))
1211simpld 494 . . . 4 (𝜑𝐶 ∈ Cat)
1311simprd 495 . . . 4 (𝜑𝐷 ∈ Cat)
14 fucco.x . . . 4 = (comp‘𝑄)
151, 2, 3, 4, 5, 12, 13, 14fuccofval 17931 . . 3 (𝜑 = (𝑣 ∈ ((𝐶 Func 𝐷) × (𝐶 Func 𝐷)), ∈ (𝐶 Func 𝐷) ↦ (1st𝑣) / 𝑓(2nd𝑣) / 𝑔(𝑏 ∈ (𝑔𝑁), 𝑎 ∈ (𝑓𝑁𝑔) ↦ (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝑓)‘𝑥), ((1st𝑔)‘𝑥)⟩ · ((1st)‘𝑥))(𝑎𝑥))))))
16 fvexd 6876 . . . 4 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → (1st𝑣) ∈ V)
17 simprl 770 . . . . . 6 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → 𝑣 = ⟨𝐹, 𝐺⟩)
1817fveq2d 6865 . . . . 5 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → (1st𝑣) = (1st ‘⟨𝐹, 𝐺⟩))
19 op1stg 7983 . . . . . . 7 ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝐺 ∈ (𝐶 Func 𝐷)) → (1st ‘⟨𝐹, 𝐺⟩) = 𝐹)
208, 19syl 17 . . . . . 6 (𝜑 → (1st ‘⟨𝐹, 𝐺⟩) = 𝐹)
2120adantr 480 . . . . 5 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → (1st ‘⟨𝐹, 𝐺⟩) = 𝐹)
2218, 21eqtrd 2765 . . . 4 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → (1st𝑣) = 𝐹)
23 fvexd 6876 . . . . 5 (((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) → (2nd𝑣) ∈ V)
2417adantr 480 . . . . . . 7 (((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) → 𝑣 = ⟨𝐹, 𝐺⟩)
2524fveq2d 6865 . . . . . 6 (((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) → (2nd𝑣) = (2nd ‘⟨𝐹, 𝐺⟩))
26 op2ndg 7984 . . . . . . . 8 ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝐺 ∈ (𝐶 Func 𝐷)) → (2nd ‘⟨𝐹, 𝐺⟩) = 𝐺)
278, 26syl 17 . . . . . . 7 (𝜑 → (2nd ‘⟨𝐹, 𝐺⟩) = 𝐺)
2827ad2antrr 726 . . . . . 6 (((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) → (2nd ‘⟨𝐹, 𝐺⟩) = 𝐺)
2925, 28eqtrd 2765 . . . . 5 (((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) → (2nd𝑣) = 𝐺)
30 simpr 484 . . . . . . 7 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → 𝑔 = 𝐺)
31 simprr 772 . . . . . . . 8 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → = 𝐻)
3231ad2antrr 726 . . . . . . 7 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → = 𝐻)
3330, 32oveq12d 7408 . . . . . 6 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (𝑔𝑁) = (𝐺𝑁𝐻))
34 simplr 768 . . . . . . 7 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → 𝑓 = 𝐹)
3534, 30oveq12d 7408 . . . . . 6 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (𝑓𝑁𝑔) = (𝐹𝑁𝐺))
3634fveq2d 6865 . . . . . . . . . . 11 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (1st𝑓) = (1st𝐹))
3736fveq1d 6863 . . . . . . . . . 10 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → ((1st𝑓)‘𝑥) = ((1st𝐹)‘𝑥))
3830fveq2d 6865 . . . . . . . . . . 11 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (1st𝑔) = (1st𝐺))
3938fveq1d 6863 . . . . . . . . . 10 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → ((1st𝑔)‘𝑥) = ((1st𝐺)‘𝑥))
4037, 39opeq12d 4848 . . . . . . . . 9 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → ⟨((1st𝑓)‘𝑥), ((1st𝑔)‘𝑥)⟩ = ⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩)
4132fveq2d 6865 . . . . . . . . . 10 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (1st) = (1st𝐻))
4241fveq1d 6863 . . . . . . . . 9 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → ((1st)‘𝑥) = ((1st𝐻)‘𝑥))
4340, 42oveq12d 7408 . . . . . . . 8 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (⟨((1st𝑓)‘𝑥), ((1st𝑔)‘𝑥)⟩ · ((1st)‘𝑥)) = (⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥)))
4443oveqd 7407 . . . . . . 7 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → ((𝑏𝑥)(⟨((1st𝑓)‘𝑥), ((1st𝑔)‘𝑥)⟩ · ((1st)‘𝑥))(𝑎𝑥)) = ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥)))
4544mpteq2dv 5204 . . . . . 6 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝑓)‘𝑥), ((1st𝑔)‘𝑥)⟩ · ((1st)‘𝑥))(𝑎𝑥))) = (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥))))
4633, 35, 45mpoeq123dv 7467 . . . . 5 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (𝑏 ∈ (𝑔𝑁), 𝑎 ∈ (𝑓𝑁𝑔) ↦ (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝑓)‘𝑥), ((1st𝑔)‘𝑥)⟩ · ((1st)‘𝑥))(𝑎𝑥)))) = (𝑏 ∈ (𝐺𝑁𝐻), 𝑎 ∈ (𝐹𝑁𝐺) ↦ (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥)))))
4723, 29, 46csbied2 3902 . . . 4 (((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) → (2nd𝑣) / 𝑔(𝑏 ∈ (𝑔𝑁), 𝑎 ∈ (𝑓𝑁𝑔) ↦ (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝑓)‘𝑥), ((1st𝑔)‘𝑥)⟩ · ((1st)‘𝑥))(𝑎𝑥)))) = (𝑏 ∈ (𝐺𝑁𝐻), 𝑎 ∈ (𝐹𝑁𝐺) ↦ (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥)))))
4816, 22, 47csbied2 3902 . . 3 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → (1st𝑣) / 𝑓(2nd𝑣) / 𝑔(𝑏 ∈ (𝑔𝑁), 𝑎 ∈ (𝑓𝑁𝑔) ↦ (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝑓)‘𝑥), ((1st𝑔)‘𝑥)⟩ · ((1st)‘𝑥))(𝑎𝑥)))) = (𝑏 ∈ (𝐺𝑁𝐻), 𝑎 ∈ (𝐹𝑁𝐺) ↦ (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥)))))
49 opelxpi 5678 . . . 4 ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝐺 ∈ (𝐶 Func 𝐷)) → ⟨𝐹, 𝐺⟩ ∈ ((𝐶 Func 𝐷) × (𝐶 Func 𝐷)))
508, 49syl 17 . . 3 (𝜑 → ⟨𝐹, 𝐺⟩ ∈ ((𝐶 Func 𝐷) × (𝐶 Func 𝐷)))
51 fucco.g . . . . 5 (𝜑𝑆 ∈ (𝐺𝑁𝐻))
523natrcl 17922 . . . . 5 (𝑆 ∈ (𝐺𝑁𝐻) → (𝐺 ∈ (𝐶 Func 𝐷) ∧ 𝐻 ∈ (𝐶 Func 𝐷)))
5351, 52syl 17 . . . 4 (𝜑 → (𝐺 ∈ (𝐶 Func 𝐷) ∧ 𝐻 ∈ (𝐶 Func 𝐷)))
5453simprd 495 . . 3 (𝜑𝐻 ∈ (𝐶 Func 𝐷))
55 ovex 7423 . . . . 5 (𝐺𝑁𝐻) ∈ V
56 ovex 7423 . . . . 5 (𝐹𝑁𝐺) ∈ V
5755, 56mpoex 8061 . . . 4 (𝑏 ∈ (𝐺𝑁𝐻), 𝑎 ∈ (𝐹𝑁𝐺) ↦ (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥)))) ∈ V
5857a1i 11 . . 3 (𝜑 → (𝑏 ∈ (𝐺𝑁𝐻), 𝑎 ∈ (𝐹𝑁𝐺) ↦ (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥)))) ∈ V)
5915, 48, 50, 54, 58ovmpod 7544 . 2 (𝜑 → (⟨𝐹, 𝐺 𝐻) = (𝑏 ∈ (𝐺𝑁𝐻), 𝑎 ∈ (𝐹𝑁𝐺) ↦ (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥)))))
60 simprl 770 . . . . 5 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → 𝑏 = 𝑆)
6160fveq1d 6863 . . . 4 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → (𝑏𝑥) = (𝑆𝑥))
62 simprr 772 . . . . 5 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → 𝑎 = 𝑅)
6362fveq1d 6863 . . . 4 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → (𝑎𝑥) = (𝑅𝑥))
6461, 63oveq12d 7408 . . 3 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥)) = ((𝑆𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑅𝑥)))
6564mpteq2dv 5204 . 2 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥))) = (𝑥𝐴 ↦ ((𝑆𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑅𝑥))))
664fvexi 6875 . . . 4 𝐴 ∈ V
6766mptex 7200 . . 3 (𝑥𝐴 ↦ ((𝑆𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑅𝑥))) ∈ V
6867a1i 11 . 2 (𝜑 → (𝑥𝐴 ↦ ((𝑆𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑅𝑥))) ∈ V)
6959, 65, 51, 6, 68ovmpod 7544 1 (𝜑 → (𝑆(⟨𝐹, 𝐺 𝐻)𝑅) = (𝑥𝐴 ↦ ((𝑆𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑅𝑥))))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1540  wcel 2109  Vcvv 3450  csb 3865  cop 4598  cmpt 5191   × cxp 5639  cfv 6514  (class class class)co 7390  cmpo 7392  1st c1st 7969  2nd c2nd 7970  Basecbs 17186  compcco 17239  Catccat 17632   Func cfunc 17823   Nat cnat 17913   FuncCat cfuc 17914
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 2702  ax-rep 5237  ax-sep 5254  ax-nul 5264  ax-pow 5323  ax-pr 5390  ax-un 7714  ax-cnex 11131  ax-resscn 11132  ax-1cn 11133  ax-icn 11134  ax-addcl 11135  ax-addrcl 11136  ax-mulcl 11137  ax-mulrcl 11138  ax-mulcom 11139  ax-addass 11140  ax-mulass 11141  ax-distr 11142  ax-i2m1 11143  ax-1ne0 11144  ax-1rid 11145  ax-rnegex 11146  ax-rrecex 11147  ax-cnre 11148  ax-pre-lttri 11149  ax-pre-lttrn 11150  ax-pre-ltadd 11151  ax-pre-mulgt0 11152
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2534  df-eu 2563  df-clab 2709  df-cleq 2722  df-clel 2804  df-nfc 2879  df-ne 2927  df-nel 3031  df-ral 3046  df-rex 3055  df-reu 3357  df-rab 3409  df-v 3452  df-sbc 3757  df-csb 3866  df-dif 3920  df-un 3922  df-in 3924  df-ss 3934  df-pss 3937  df-nul 4300  df-if 4492  df-pw 4568  df-sn 4593  df-pr 4595  df-tp 4597  df-op 4599  df-uni 4875  df-iun 4960  df-br 5111  df-opab 5173  df-mpt 5192  df-tr 5218  df-id 5536  df-eprel 5541  df-po 5549  df-so 5550  df-fr 5594  df-we 5596  df-xp 5647  df-rel 5648  df-cnv 5649  df-co 5650  df-dm 5651  df-rn 5652  df-res 5653  df-ima 5654  df-pred 6277  df-ord 6338  df-on 6339  df-lim 6340  df-suc 6341  df-iota 6467  df-fun 6516  df-fn 6517  df-f 6518  df-f1 6519  df-fo 6520  df-f1o 6521  df-fv 6522  df-riota 7347  df-ov 7393  df-oprab 7394  df-mpo 7395  df-om 7846  df-1st 7971  df-2nd 7972  df-frecs 8263  df-wrecs 8294  df-recs 8343  df-rdg 8381  df-1o 8437  df-er 8674  df-ixp 8874  df-en 8922  df-dom 8923  df-sdom 8924  df-fin 8925  df-pnf 11217  df-mnf 11218  df-xr 11219  df-ltxr 11220  df-le 11221  df-sub 11414  df-neg 11415  df-nn 12194  df-2 12256  df-3 12257  df-4 12258  df-5 12259  df-6 12260  df-7 12261  df-8 12262  df-9 12263  df-n0 12450  df-z 12537  df-dec 12657  df-uz 12801  df-fz 13476  df-struct 17124  df-slot 17159  df-ndx 17171  df-base 17187  df-hom 17251  df-cco 17252  df-func 17827  df-nat 17915  df-fuc 17916
This theorem is referenced by:  fuccoval  17935  fuccocl  17936  fuclid  17938  fucrid  17939  fucass  17940  fucsect  17944  curfcl  18200  xpcfucco3  49251  fucocolem4  49349  fucoppcco  49402  islmd  49658  iscmd  49659
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