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Theorem fucco 17680
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 2738 . . . 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 17666 . . . . . . . 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 495 . . . . . 6 (𝜑𝐹 ∈ (𝐶 Func 𝐷))
10 funcrcl 17578 . . . . . 6 (𝐹 ∈ (𝐶 Func 𝐷) → (𝐶 ∈ Cat ∧ 𝐷 ∈ Cat))
119, 10syl 17 . . . . 5 (𝜑 → (𝐶 ∈ Cat ∧ 𝐷 ∈ Cat))
1211simpld 495 . . . 4 (𝜑𝐶 ∈ Cat)
1311simprd 496 . . . 4 (𝜑𝐷 ∈ Cat)
14 fucco.x . . . 4 = (comp‘𝑄)
151, 2, 3, 4, 5, 12, 13, 14fuccofval 17676 . . 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 6789 . . . 4 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → (1st𝑣) ∈ V)
17 simprl 768 . . . . . 6 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → 𝑣 = ⟨𝐹, 𝐺⟩)
1817fveq2d 6778 . . . . 5 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → (1st𝑣) = (1st ‘⟨𝐹, 𝐺⟩))
19 op1stg 7843 . . . . . . 7 ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝐺 ∈ (𝐶 Func 𝐷)) → (1st ‘⟨𝐹, 𝐺⟩) = 𝐹)
208, 19syl 17 . . . . . 6 (𝜑 → (1st ‘⟨𝐹, 𝐺⟩) = 𝐹)
2120adantr 481 . . . . 5 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → (1st ‘⟨𝐹, 𝐺⟩) = 𝐹)
2218, 21eqtrd 2778 . . . 4 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → (1st𝑣) = 𝐹)
23 fvexd 6789 . . . . 5 (((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) → (2nd𝑣) ∈ V)
2417adantr 481 . . . . . . 7 (((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) → 𝑣 = ⟨𝐹, 𝐺⟩)
2524fveq2d 6778 . . . . . 6 (((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) → (2nd𝑣) = (2nd ‘⟨𝐹, 𝐺⟩))
26 op2ndg 7844 . . . . . . . 8 ((𝐹 ∈ (𝐶 Func 𝐷) ∧ 𝐺 ∈ (𝐶 Func 𝐷)) → (2nd ‘⟨𝐹, 𝐺⟩) = 𝐺)
278, 26syl 17 . . . . . . 7 (𝜑 → (2nd ‘⟨𝐹, 𝐺⟩) = 𝐺)
2827ad2antrr 723 . . . . . 6 (((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) → (2nd ‘⟨𝐹, 𝐺⟩) = 𝐺)
2925, 28eqtrd 2778 . . . . 5 (((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) → (2nd𝑣) = 𝐺)
30 simpr 485 . . . . . . 7 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → 𝑔 = 𝐺)
31 simprr 770 . . . . . . . 8 ((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) → = 𝐻)
3231ad2antrr 723 . . . . . . 7 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → = 𝐻)
3330, 32oveq12d 7293 . . . . . 6 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (𝑔𝑁) = (𝐺𝑁𝐻))
34 simplr 766 . . . . . . 7 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → 𝑓 = 𝐹)
3534, 30oveq12d 7293 . . . . . 6 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (𝑓𝑁𝑔) = (𝐹𝑁𝐺))
3634fveq2d 6778 . . . . . . . . . . 11 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (1st𝑓) = (1st𝐹))
3736fveq1d 6776 . . . . . . . . . 10 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → ((1st𝑓)‘𝑥) = ((1st𝐹)‘𝑥))
3830fveq2d 6778 . . . . . . . . . . 11 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (1st𝑔) = (1st𝐺))
3938fveq1d 6776 . . . . . . . . . 10 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → ((1st𝑔)‘𝑥) = ((1st𝐺)‘𝑥))
4037, 39opeq12d 4812 . . . . . . . . 9 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → ⟨((1st𝑓)‘𝑥), ((1st𝑔)‘𝑥)⟩ = ⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩)
4132fveq2d 6778 . . . . . . . . . 10 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (1st) = (1st𝐻))
4241fveq1d 6776 . . . . . . . . 9 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → ((1st)‘𝑥) = ((1st𝐻)‘𝑥))
4340, 42oveq12d 7293 . . . . . . . 8 ((((𝜑 ∧ (𝑣 = ⟨𝐹, 𝐺⟩ ∧ = 𝐻)) ∧ 𝑓 = 𝐹) ∧ 𝑔 = 𝐺) → (⟨((1st𝑓)‘𝑥), ((1st𝑔)‘𝑥)⟩ · ((1st)‘𝑥)) = (⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥)))
4443oveqd 7292 . . . . . . 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 5176 . . . . . 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 7350 . . . . 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 3872 . . . 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 3872 . . 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 5626 . . . 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 17666 . . . . 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 496 . . 3 (𝜑𝐻 ∈ (𝐶 Func 𝐷))
55 ovex 7308 . . . . 5 (𝐺𝑁𝐻) ∈ V
56 ovex 7308 . . . . 5 (𝐹𝑁𝐺) ∈ V
5755, 56mpoex 7920 . . . 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 7425 . 2 (𝜑 → (⟨𝐹, 𝐺 𝐻) = (𝑏 ∈ (𝐺𝑁𝐻), 𝑎 ∈ (𝐹𝑁𝐺) ↦ (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥)))))
60 simprl 768 . . . . 5 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → 𝑏 = 𝑆)
6160fveq1d 6776 . . . 4 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → (𝑏𝑥) = (𝑆𝑥))
62 simprr 770 . . . . 5 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → 𝑎 = 𝑅)
6362fveq1d 6776 . . . 4 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → (𝑎𝑥) = (𝑅𝑥))
6461, 63oveq12d 7293 . . 3 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥)) = ((𝑆𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑅𝑥)))
6564mpteq2dv 5176 . 2 ((𝜑 ∧ (𝑏 = 𝑆𝑎 = 𝑅)) → (𝑥𝐴 ↦ ((𝑏𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑎𝑥))) = (𝑥𝐴 ↦ ((𝑆𝑥)(⟨((1st𝐹)‘𝑥), ((1st𝐺)‘𝑥)⟩ · ((1st𝐻)‘𝑥))(𝑅𝑥))))
664fvexi 6788 . . . 4 𝐴 ∈ V
6766mptex 7099 . . 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 7425 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 396   = wceq 1539  wcel 2106  Vcvv 3432  csb 3832  cop 4567  cmpt 5157   × cxp 5587  cfv 6433  (class class class)co 7275  cmpo 7277  1st c1st 7829  2nd c2nd 7830  Basecbs 16912  compcco 16974  Catccat 17373   Func cfunc 17569   Nat cnat 17657   FuncCat cfuc 17658
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-rep 5209  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352  ax-un 7588  ax-cnex 10927  ax-resscn 10928  ax-1cn 10929  ax-icn 10930  ax-addcl 10931  ax-addrcl 10932  ax-mulcl 10933  ax-mulrcl 10934  ax-mulcom 10935  ax-addass 10936  ax-mulass 10937  ax-distr 10938  ax-i2m1 10939  ax-1ne0 10940  ax-1rid 10941  ax-rnegex 10942  ax-rrecex 10943  ax-cnre 10944  ax-pre-lttri 10945  ax-pre-lttrn 10946  ax-pre-ltadd 10947  ax-pre-mulgt0 10948
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-nel 3050  df-ral 3069  df-rex 3070  df-reu 3072  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-pss 3906  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-tp 4566  df-op 4568  df-uni 4840  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-tr 5192  df-id 5489  df-eprel 5495  df-po 5503  df-so 5504  df-fr 5544  df-we 5546  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-pred 6202  df-ord 6269  df-on 6270  df-lim 6271  df-suc 6272  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441  df-riota 7232  df-ov 7278  df-oprab 7279  df-mpo 7280  df-om 7713  df-1st 7831  df-2nd 7832  df-frecs 8097  df-wrecs 8128  df-recs 8202  df-rdg 8241  df-1o 8297  df-er 8498  df-ixp 8686  df-en 8734  df-dom 8735  df-sdom 8736  df-fin 8737  df-pnf 11011  df-mnf 11012  df-xr 11013  df-ltxr 11014  df-le 11015  df-sub 11207  df-neg 11208  df-nn 11974  df-2 12036  df-3 12037  df-4 12038  df-5 12039  df-6 12040  df-7 12041  df-8 12042  df-9 12043  df-n0 12234  df-z 12320  df-dec 12438  df-uz 12583  df-fz 13240  df-struct 16848  df-slot 16883  df-ndx 16895  df-base 16913  df-hom 16986  df-cco 16987  df-func 17573  df-nat 17659  df-fuc 17660
This theorem is referenced by:  fuccoval  17681  fuccocl  17682  fuclid  17684  fucrid  17685  fucass  17686  fucsect  17690  curfcl  17950
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