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Theorem f1o2ndf1 5952
Description: The 2nd (second member of an ordered pair) function restricted to a one-to-one function 𝐹 is a one-to-one function of 𝐹 onto the range of 𝐹. (Contributed by Alexander van der Vekens, 4-Feb-2018.)
Assertion
Ref Expression
f1o2ndf1 (𝐹:𝐴1-1𝐵 → (2nd𝐹):𝐹1-1-onto→ran 𝐹)

Proof of Theorem f1o2ndf1
Dummy variables 𝑎 𝑏 𝑣 𝑤 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 f1f 5181 . . 3 (𝐹:𝐴1-1𝐵𝐹:𝐴𝐵)
2 fo2ndf 5951 . . 3 (𝐹:𝐴𝐵 → (2nd𝐹):𝐹onto→ran 𝐹)
31, 2syl 14 . 2 (𝐹:𝐴1-1𝐵 → (2nd𝐹):𝐹onto→ran 𝐹)
4 f2ndf 5950 . . . . 5 (𝐹:𝐴𝐵 → (2nd𝐹):𝐹𝐵)
51, 4syl 14 . . . 4 (𝐹:𝐴1-1𝐵 → (2nd𝐹):𝐹𝐵)
6 fssxp 5144 . . . . . . 7 (𝐹:𝐴𝐵𝐹 ⊆ (𝐴 × 𝐵))
71, 6syl 14 . . . . . 6 (𝐹:𝐴1-1𝐵𝐹 ⊆ (𝐴 × 𝐵))
8 ssel2 3009 . . . . . . . . . . 11 ((𝐹 ⊆ (𝐴 × 𝐵) ∧ 𝑥𝐹) → 𝑥 ∈ (𝐴 × 𝐵))
9 elxp2 4431 . . . . . . . . . . 11 (𝑥 ∈ (𝐴 × 𝐵) ↔ ∃𝑎𝐴𝑣𝐵 𝑥 = ⟨𝑎, 𝑣⟩)
108, 9sylib 120 . . . . . . . . . 10 ((𝐹 ⊆ (𝐴 × 𝐵) ∧ 𝑥𝐹) → ∃𝑎𝐴𝑣𝐵 𝑥 = ⟨𝑎, 𝑣⟩)
11 ssel2 3009 . . . . . . . . . . 11 ((𝐹 ⊆ (𝐴 × 𝐵) ∧ 𝑦𝐹) → 𝑦 ∈ (𝐴 × 𝐵))
12 elxp2 4431 . . . . . . . . . . 11 (𝑦 ∈ (𝐴 × 𝐵) ↔ ∃𝑏𝐴𝑤𝐵 𝑦 = ⟨𝑏, 𝑤⟩)
1311, 12sylib 120 . . . . . . . . . 10 ((𝐹 ⊆ (𝐴 × 𝐵) ∧ 𝑦𝐹) → ∃𝑏𝐴𝑤𝐵 𝑦 = ⟨𝑏, 𝑤⟩)
1410, 13anim12dan 565 . . . . . . . . 9 ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (𝑥𝐹𝑦𝐹)) → (∃𝑎𝐴𝑣𝐵 𝑥 = ⟨𝑎, 𝑣⟩ ∧ ∃𝑏𝐴𝑤𝐵 𝑦 = ⟨𝑏, 𝑤⟩))
15 fvres 5294 . . . . . . . . . . . . . . . . . . . . . . . . 25 (⟨𝑎, 𝑣⟩ ∈ 𝐹 → ((2nd𝐹)‘⟨𝑎, 𝑣⟩) = (2nd ‘⟨𝑎, 𝑣⟩))
1615adantr 270 . . . . . . . . . . . . . . . . . . . . . . . 24 ((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) → ((2nd𝐹)‘⟨𝑎, 𝑣⟩) = (2nd ‘⟨𝑎, 𝑣⟩))
1716adantr 270 . . . . . . . . . . . . . . . . . . . . . . 23 (((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) ∧ ((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵))) → ((2nd𝐹)‘⟨𝑎, 𝑣⟩) = (2nd ‘⟨𝑎, 𝑣⟩))
18 fvres 5294 . . . . . . . . . . . . . . . . . . . . . . . 24 (⟨𝑏, 𝑤⟩ ∈ 𝐹 → ((2nd𝐹)‘⟨𝑏, 𝑤⟩) = (2nd ‘⟨𝑏, 𝑤⟩))
1918ad2antlr 473 . . . . . . . . . . . . . . . . . . . . . . 23 (((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) ∧ ((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵))) → ((2nd𝐹)‘⟨𝑏, 𝑤⟩) = (2nd ‘⟨𝑏, 𝑤⟩))
2017, 19eqeq12d 2099 . . . . . . . . . . . . . . . . . . . . . 22 (((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) ∧ ((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵))) → (((2nd𝐹)‘⟨𝑎, 𝑣⟩) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩) ↔ (2nd ‘⟨𝑎, 𝑣⟩) = (2nd ‘⟨𝑏, 𝑤⟩)))
21 vex 2618 . . . . . . . . . . . . . . . . . . . . . . . . 25 𝑎 ∈ V
22 vex 2618 . . . . . . . . . . . . . . . . . . . . . . . . 25 𝑣 ∈ V
2321, 22op2nd 5877 . . . . . . . . . . . . . . . . . . . . . . . 24 (2nd ‘⟨𝑎, 𝑣⟩) = 𝑣
24 vex 2618 . . . . . . . . . . . . . . . . . . . . . . . . 25 𝑏 ∈ V
25 vex 2618 . . . . . . . . . . . . . . . . . . . . . . . . 25 𝑤 ∈ V
2624, 25op2nd 5877 . . . . . . . . . . . . . . . . . . . . . . . 24 (2nd ‘⟨𝑏, 𝑤⟩) = 𝑤
2723, 26eqeq12i 2098 . . . . . . . . . . . . . . . . . . . . . . 23 ((2nd ‘⟨𝑎, 𝑣⟩) = (2nd ‘⟨𝑏, 𝑤⟩) ↔ 𝑣 = 𝑤)
28 f1fun 5184 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝐹:𝐴1-1𝐵 → Fun 𝐹)
29 funopfv 5309 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (Fun 𝐹 → (⟨𝑎, 𝑣⟩ ∈ 𝐹 → (𝐹𝑎) = 𝑣))
30 funopfv 5309 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (Fun 𝐹 → (⟨𝑏, 𝑤⟩ ∈ 𝐹 → (𝐹𝑏) = 𝑤))
3129, 30anim12d 328 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (Fun 𝐹 → ((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) → ((𝐹𝑎) = 𝑣 ∧ (𝐹𝑏) = 𝑤)))
3228, 31syl 14 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝐹:𝐴1-1𝐵 → ((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) → ((𝐹𝑎) = 𝑣 ∧ (𝐹𝑏) = 𝑤)))
33 eqcom 2087 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ((𝐹𝑎) = 𝑣𝑣 = (𝐹𝑎))
3433biimpi 118 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ((𝐹𝑎) = 𝑣𝑣 = (𝐹𝑎))
35 eqcom 2087 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ((𝐹𝑏) = 𝑤𝑤 = (𝐹𝑏))
3635biimpi 118 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ((𝐹𝑏) = 𝑤𝑤 = (𝐹𝑏))
3734, 36eqeqan12d 2100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 (((𝐹𝑎) = 𝑣 ∧ (𝐹𝑏) = 𝑤) → (𝑣 = 𝑤 ↔ (𝐹𝑎) = (𝐹𝑏)))
38 simpl 107 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 ((𝑎𝐴𝑣𝐵) → 𝑎𝐴)
39 simpl 107 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 ((𝑏𝐴𝑤𝐵) → 𝑏𝐴)
4038, 39anim12i 331 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → (𝑎𝐴𝑏𝐴))
41 f1veqaeq 5511 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 ((𝐹:𝐴1-1𝐵 ∧ (𝑎𝐴𝑏𝐴)) → ((𝐹𝑎) = (𝐹𝑏) → 𝑎 = 𝑏))
4240, 41sylan2 280 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 ((𝐹:𝐴1-1𝐵 ∧ ((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵))) → ((𝐹𝑎) = (𝐹𝑏) → 𝑎 = 𝑏))
43 opeq12 3609 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 ((𝑎 = 𝑏𝑣 = 𝑤) → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩)
4443ex 113 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 (𝑎 = 𝑏 → (𝑣 = 𝑤 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))
4542, 44syl6 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ((𝐹:𝐴1-1𝐵 ∧ ((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵))) → ((𝐹𝑎) = (𝐹𝑏) → (𝑣 = 𝑤 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩)))
4645com23 77 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ((𝐹:𝐴1-1𝐵 ∧ ((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵))) → (𝑣 = 𝑤 → ((𝐹𝑎) = (𝐹𝑏) → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩)))
4746ex 113 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 (𝐹:𝐴1-1𝐵 → (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → (𝑣 = 𝑤 → ((𝐹𝑎) = (𝐹𝑏) → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
4847com14 87 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ((𝐹𝑎) = (𝐹𝑏) → (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → (𝑣 = 𝑤 → (𝐹:𝐴1-1𝐵 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
4937, 48syl6bi 161 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 (((𝐹𝑎) = 𝑣 ∧ (𝐹𝑏) = 𝑤) → (𝑣 = 𝑤 → (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → (𝑣 = 𝑤 → (𝐹:𝐴1-1𝐵 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩)))))
5049com14 87 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (𝑣 = 𝑤 → (𝑣 = 𝑤 → (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → (((𝐹𝑎) = 𝑣 ∧ (𝐹𝑏) = 𝑤) → (𝐹:𝐴1-1𝐵 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩)))))
5150pm2.43i 48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝑣 = 𝑤 → (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → (((𝐹𝑎) = 𝑣 ∧ (𝐹𝑏) = 𝑤) → (𝐹:𝐴1-1𝐵 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
5251com14 87 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝐹:𝐴1-1𝐵 → (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → (((𝐹𝑎) = 𝑣 ∧ (𝐹𝑏) = 𝑤) → (𝑣 = 𝑤 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
5352com23 77 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝐹:𝐴1-1𝐵 → (((𝐹𝑎) = 𝑣 ∧ (𝐹𝑏) = 𝑤) → (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → (𝑣 = 𝑤 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
5432, 53syld 44 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝐹:𝐴1-1𝐵 → ((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) → (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → (𝑣 = 𝑤 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
5554com13 79 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → ((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) → (𝐹:𝐴1-1𝐵 → (𝑣 = 𝑤 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
5655impcom 123 . . . . . . . . . . . . . . . . . . . . . . . 24 (((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) ∧ ((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵))) → (𝐹:𝐴1-1𝐵 → (𝑣 = 𝑤 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩)))
5756com23 77 . . . . . . . . . . . . . . . . . . . . . . 23 (((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) ∧ ((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵))) → (𝑣 = 𝑤 → (𝐹:𝐴1-1𝐵 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩)))
5827, 57syl5bi 150 . . . . . . . . . . . . . . . . . . . . . 22 (((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) ∧ ((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵))) → ((2nd ‘⟨𝑎, 𝑣⟩) = (2nd ‘⟨𝑏, 𝑤⟩) → (𝐹:𝐴1-1𝐵 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩)))
5920, 58sylbid 148 . . . . . . . . . . . . . . . . . . . . 21 (((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) ∧ ((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵))) → (((2nd𝐹)‘⟨𝑎, 𝑣⟩) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩) → (𝐹:𝐴1-1𝐵 → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩)))
6059com23 77 . . . . . . . . . . . . . . . . . . . 20 (((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) ∧ ((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵))) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘⟨𝑎, 𝑣⟩) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩) → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩)))
6160ex 113 . . . . . . . . . . . . . . . . . . 19 ((⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹) → (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘⟨𝑎, 𝑣⟩) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩) → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
6261adantl 271 . . . . . . . . . . . . . . . . . 18 ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹)) → (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘⟨𝑎, 𝑣⟩) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩) → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
6362com12 30 . . . . . . . . . . . . . . . . 17 (((𝑎𝐴𝑣𝐵) ∧ (𝑏𝐴𝑤𝐵)) → ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘⟨𝑎, 𝑣⟩) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩) → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
6463adantlr 461 . . . . . . . . . . . . . . . 16 ((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) → ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘⟨𝑎, 𝑣⟩) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩) → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
6564adantr 270 . . . . . . . . . . . . . . 15 (((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) ∧ 𝑦 = ⟨𝑏, 𝑤⟩) → ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘⟨𝑎, 𝑣⟩) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩) → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
66 eleq1 2147 . . . . . . . . . . . . . . . . . 18 (𝑥 = ⟨𝑎, 𝑣⟩ → (𝑥𝐹 ↔ ⟨𝑎, 𝑣⟩ ∈ 𝐹))
6766ad2antlr 473 . . . . . . . . . . . . . . . . 17 ((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) → (𝑥𝐹 ↔ ⟨𝑎, 𝑣⟩ ∈ 𝐹))
68 eleq1 2147 . . . . . . . . . . . . . . . . 17 (𝑦 = ⟨𝑏, 𝑤⟩ → (𝑦𝐹 ↔ ⟨𝑏, 𝑤⟩ ∈ 𝐹))
6967, 68bi2anan9 571 . . . . . . . . . . . . . . . 16 (((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) ∧ 𝑦 = ⟨𝑏, 𝑤⟩) → ((𝑥𝐹𝑦𝐹) ↔ (⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹)))
7069anbi2d 452 . . . . . . . . . . . . . . 15 (((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) ∧ 𝑦 = ⟨𝑏, 𝑤⟩) → ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (𝑥𝐹𝑦𝐹)) ↔ (𝐹 ⊆ (𝐴 × 𝐵) ∧ (⟨𝑎, 𝑣⟩ ∈ 𝐹 ∧ ⟨𝑏, 𝑤⟩ ∈ 𝐹))))
71 fveq2 5270 . . . . . . . . . . . . . . . . . . 19 (𝑥 = ⟨𝑎, 𝑣⟩ → ((2nd𝐹)‘𝑥) = ((2nd𝐹)‘⟨𝑎, 𝑣⟩))
7271ad2antlr 473 . . . . . . . . . . . . . . . . . 18 ((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) → ((2nd𝐹)‘𝑥) = ((2nd𝐹)‘⟨𝑎, 𝑣⟩))
73 fveq2 5270 . . . . . . . . . . . . . . . . . 18 (𝑦 = ⟨𝑏, 𝑤⟩ → ((2nd𝐹)‘𝑦) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩))
7472, 73eqeqan12d 2100 . . . . . . . . . . . . . . . . 17 (((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) ∧ 𝑦 = ⟨𝑏, 𝑤⟩) → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) ↔ ((2nd𝐹)‘⟨𝑎, 𝑣⟩) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩)))
75 simpllr 501 . . . . . . . . . . . . . . . . . 18 (((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) ∧ 𝑦 = ⟨𝑏, 𝑤⟩) → 𝑥 = ⟨𝑎, 𝑣⟩)
76 simpr 108 . . . . . . . . . . . . . . . . . 18 (((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) ∧ 𝑦 = ⟨𝑏, 𝑤⟩) → 𝑦 = ⟨𝑏, 𝑤⟩)
7775, 76eqeq12d 2099 . . . . . . . . . . . . . . . . 17 (((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) ∧ 𝑦 = ⟨𝑏, 𝑤⟩) → (𝑥 = 𝑦 ↔ ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))
7874, 77imbi12d 232 . . . . . . . . . . . . . . . 16 (((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) ∧ 𝑦 = ⟨𝑏, 𝑤⟩) → ((((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦) ↔ (((2nd𝐹)‘⟨𝑎, 𝑣⟩) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩) → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩)))
7978imbi2d 228 . . . . . . . . . . . . . . 15 (((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) ∧ 𝑦 = ⟨𝑏, 𝑤⟩) → ((𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦)) ↔ (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘⟨𝑎, 𝑣⟩) = ((2nd𝐹)‘⟨𝑏, 𝑤⟩) → ⟨𝑎, 𝑣⟩ = ⟨𝑏, 𝑤⟩))))
8065, 70, 793imtr4d 201 . . . . . . . . . . . . . 14 (((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) ∧ 𝑦 = ⟨𝑏, 𝑤⟩) → ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (𝑥𝐹𝑦𝐹)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦))))
8180ex 113 . . . . . . . . . . . . 13 ((((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) ∧ (𝑏𝐴𝑤𝐵)) → (𝑦 = ⟨𝑏, 𝑤⟩ → ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (𝑥𝐹𝑦𝐹)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦)))))
8281rexlimdvva 2492 . . . . . . . . . . . 12 (((𝑎𝐴𝑣𝐵) ∧ 𝑥 = ⟨𝑎, 𝑣⟩) → (∃𝑏𝐴𝑤𝐵 𝑦 = ⟨𝑏, 𝑤⟩ → ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (𝑥𝐹𝑦𝐹)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦)))))
8382ex 113 . . . . . . . . . . 11 ((𝑎𝐴𝑣𝐵) → (𝑥 = ⟨𝑎, 𝑣⟩ → (∃𝑏𝐴𝑤𝐵 𝑦 = ⟨𝑏, 𝑤⟩ → ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (𝑥𝐹𝑦𝐹)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦))))))
8483rexlimivv 2490 . . . . . . . . . 10 (∃𝑎𝐴𝑣𝐵 𝑥 = ⟨𝑎, 𝑣⟩ → (∃𝑏𝐴𝑤𝐵 𝑦 = ⟨𝑏, 𝑤⟩ → ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (𝑥𝐹𝑦𝐹)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦)))))
8584imp 122 . . . . . . . . 9 ((∃𝑎𝐴𝑣𝐵 𝑥 = ⟨𝑎, 𝑣⟩ ∧ ∃𝑏𝐴𝑤𝐵 𝑦 = ⟨𝑏, 𝑤⟩) → ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (𝑥𝐹𝑦𝐹)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦))))
8614, 85mpcom 36 . . . . . . . 8 ((𝐹 ⊆ (𝐴 × 𝐵) ∧ (𝑥𝐹𝑦𝐹)) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦)))
8786ex 113 . . . . . . 7 (𝐹 ⊆ (𝐴 × 𝐵) → ((𝑥𝐹𝑦𝐹) → (𝐹:𝐴1-1𝐵 → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦))))
8887com23 77 . . . . . 6 (𝐹 ⊆ (𝐴 × 𝐵) → (𝐹:𝐴1-1𝐵 → ((𝑥𝐹𝑦𝐹) → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦))))
897, 88mpcom 36 . . . . 5 (𝐹:𝐴1-1𝐵 → ((𝑥𝐹𝑦𝐹) → (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦)))
9089ralrimivv 2450 . . . 4 (𝐹:𝐴1-1𝐵 → ∀𝑥𝐹𝑦𝐹 (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦))
91 dff13 5510 . . . 4 ((2nd𝐹):𝐹1-1𝐵 ↔ ((2nd𝐹):𝐹𝐵 ∧ ∀𝑥𝐹𝑦𝐹 (((2nd𝐹)‘𝑥) = ((2nd𝐹)‘𝑦) → 𝑥 = 𝑦)))
925, 90, 91sylanbrc 408 . . 3 (𝐹:𝐴1-1𝐵 → (2nd𝐹):𝐹1-1𝐵)
93 df-f1 4988 . . . 4 ((2nd𝐹):𝐹1-1𝐵 ↔ ((2nd𝐹):𝐹𝐵 ∧ Fun (2nd𝐹)))
9493simprbi 269 . . 3 ((2nd𝐹):𝐹1-1𝐵 → Fun (2nd𝐹))
9592, 94syl 14 . 2 (𝐹:𝐴1-1𝐵 → Fun (2nd𝐹))
96 dff1o3 5224 . 2 ((2nd𝐹):𝐹1-1-onto→ran 𝐹 ↔ ((2nd𝐹):𝐹onto→ran 𝐹 ∧ Fun (2nd𝐹)))
973, 95, 96sylanbrc 408 1 (𝐹:𝐴1-1𝐵 → (2nd𝐹):𝐹1-1-onto→ran 𝐹)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 102  wb 103   = wceq 1287  wcel 1436  wral 2355  wrex 2356  wss 2988  cop 3434   × cxp 4411  ccnv 4412  ran crn 4414  cres 4415  Fun wfun 4977  wf 4979  1-1wf1 4980  ontowfo 4981  1-1-ontowf1o 4982  cfv 4983  2nd c2nd 5869
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 663  ax-5 1379  ax-7 1380  ax-gen 1381  ax-ie1 1425  ax-ie2 1426  ax-8 1438  ax-10 1439  ax-11 1440  ax-i12 1441  ax-bndl 1442  ax-4 1443  ax-13 1447  ax-14 1448  ax-17 1462  ax-i9 1466  ax-ial 1470  ax-i5r 1471  ax-ext 2067  ax-sep 3934  ax-pow 3986  ax-pr 4012  ax-un 4236
This theorem depends on definitions:  df-bi 115  df-3an 924  df-tru 1290  df-nf 1393  df-sb 1690  df-eu 1948  df-mo 1949  df-clab 2072  df-cleq 2078  df-clel 2081  df-nfc 2214  df-ral 2360  df-rex 2361  df-rab 2364  df-v 2617  df-sbc 2830  df-csb 2923  df-un 2992  df-in 2994  df-ss 3001  df-pw 3417  df-sn 3437  df-pr 3438  df-op 3440  df-uni 3639  df-iun 3717  df-br 3823  df-opab 3877  df-mpt 3878  df-id 4096  df-xp 4419  df-rel 4420  df-cnv 4421  df-co 4422  df-dm 4423  df-rn 4424  df-res 4425  df-ima 4426  df-iota 4948  df-fun 4985  df-fn 4986  df-f 4987  df-f1 4988  df-fo 4989  df-f1o 4990  df-fv 4991  df-2nd 5871
This theorem is referenced by:  fihashf1rn  10115
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