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Theorem tz7.48lem 8201
Description: A way of showing an ordinal function is one-to-one. (Contributed by NM, 9-Feb-1997.)
Hypothesis
Ref Expression
tz7.48.1 𝐹 Fn On
Assertion
Ref Expression
tz7.48lem ((𝐴 ⊆ On ∧ ∀𝑥𝐴𝑦𝑥 ¬ (𝐹𝑥) = (𝐹𝑦)) → Fun (𝐹𝐴))
Distinct variable groups:   𝑦,𝐴,𝑥   𝑥,𝐹,𝑦   𝑥,𝐴

Proof of Theorem tz7.48lem
Dummy variables 𝑧 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 r2al 3125 . . . . . . 7 (∀𝑥𝐴𝑦𝑥 ¬ (𝐹𝑥) = (𝐹𝑦) ↔ ∀𝑥𝑦((𝑥𝐴𝑦𝑥) → ¬ (𝐹𝑥) = (𝐹𝑦)))
2 simpl 486 . . . . . . . . . . 11 ((𝑥𝐴𝑦𝐴) → 𝑥𝐴)
32anim1i 618 . . . . . . . . . 10 (((𝑥𝐴𝑦𝐴) ∧ 𝑦𝑥) → (𝑥𝐴𝑦𝑥))
43imim1i 63 . . . . . . . . 9 (((𝑥𝐴𝑦𝑥) → ¬ (𝐹𝑥) = (𝐹𝑦)) → (((𝑥𝐴𝑦𝐴) ∧ 𝑦𝑥) → ¬ (𝐹𝑥) = (𝐹𝑦)))
54expd 419 . . . . . . . 8 (((𝑥𝐴𝑦𝑥) → ¬ (𝐹𝑥) = (𝐹𝑦)) → ((𝑥𝐴𝑦𝐴) → (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))))
652alimi 1820 . . . . . . 7 (∀𝑥𝑦((𝑥𝐴𝑦𝑥) → ¬ (𝐹𝑥) = (𝐹𝑦)) → ∀𝑥𝑦((𝑥𝐴𝑦𝐴) → (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))))
71, 6sylbi 220 . . . . . 6 (∀𝑥𝐴𝑦𝑥 ¬ (𝐹𝑥) = (𝐹𝑦) → ∀𝑥𝑦((𝑥𝐴𝑦𝐴) → (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))))
8 r2al 3125 . . . . . 6 (∀𝑥𝐴𝑦𝐴 (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)) ↔ ∀𝑥𝑦((𝑥𝐴𝑦𝐴) → (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))))
97, 8sylibr 237 . . . . 5 (∀𝑥𝐴𝑦𝑥 ¬ (𝐹𝑥) = (𝐹𝑦) → ∀𝑥𝐴𝑦𝐴 (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)))
10 elequ1 2119 . . . . . . . . . . . 12 (𝑦 = 𝑤 → (𝑦𝑥𝑤𝑥))
11 fveq2 6739 . . . . . . . . . . . . . 14 (𝑦 = 𝑤 → (𝐹𝑦) = (𝐹𝑤))
1211eqeq2d 2750 . . . . . . . . . . . . 13 (𝑦 = 𝑤 → ((𝐹𝑥) = (𝐹𝑦) ↔ (𝐹𝑥) = (𝐹𝑤)))
1312notbid 321 . . . . . . . . . . . 12 (𝑦 = 𝑤 → (¬ (𝐹𝑥) = (𝐹𝑦) ↔ ¬ (𝐹𝑥) = (𝐹𝑤)))
1410, 13imbi12d 348 . . . . . . . . . . 11 (𝑦 = 𝑤 → ((𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)) ↔ (𝑤𝑥 → ¬ (𝐹𝑥) = (𝐹𝑤))))
1514cbvralvw 3373 . . . . . . . . . 10 (∀𝑦𝐴 (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)) ↔ ∀𝑤𝐴 (𝑤𝑥 → ¬ (𝐹𝑥) = (𝐹𝑤)))
1615ralbii 3091 . . . . . . . . 9 (∀𝑥𝐴𝑦𝐴 (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)) ↔ ∀𝑥𝐴𝑤𝐴 (𝑤𝑥 → ¬ (𝐹𝑥) = (𝐹𝑤)))
17 elequ2 2127 . . . . . . . . . . . 12 (𝑥 = 𝑧 → (𝑤𝑥𝑤𝑧))
18 fveqeq2 6748 . . . . . . . . . . . . 13 (𝑥 = 𝑧 → ((𝐹𝑥) = (𝐹𝑤) ↔ (𝐹𝑧) = (𝐹𝑤)))
1918notbid 321 . . . . . . . . . . . 12 (𝑥 = 𝑧 → (¬ (𝐹𝑥) = (𝐹𝑤) ↔ ¬ (𝐹𝑧) = (𝐹𝑤)))
2017, 19imbi12d 348 . . . . . . . . . . 11 (𝑥 = 𝑧 → ((𝑤𝑥 → ¬ (𝐹𝑥) = (𝐹𝑤)) ↔ (𝑤𝑧 → ¬ (𝐹𝑧) = (𝐹𝑤))))
2120ralbidv 3121 . . . . . . . . . 10 (𝑥 = 𝑧 → (∀𝑤𝐴 (𝑤𝑥 → ¬ (𝐹𝑥) = (𝐹𝑤)) ↔ ∀𝑤𝐴 (𝑤𝑧 → ¬ (𝐹𝑧) = (𝐹𝑤))))
2221cbvralvw 3373 . . . . . . . . 9 (∀𝑥𝐴𝑤𝐴 (𝑤𝑥 → ¬ (𝐹𝑥) = (𝐹𝑤)) ↔ ∀𝑧𝐴𝑤𝐴 (𝑤𝑧 → ¬ (𝐹𝑧) = (𝐹𝑤)))
23 elequ1 2119 . . . . . . . . . . . . 13 (𝑤 = 𝑥 → (𝑤𝑧𝑥𝑧))
24 fveq2 6739 . . . . . . . . . . . . . . 15 (𝑤 = 𝑥 → (𝐹𝑤) = (𝐹𝑥))
2524eqeq2d 2750 . . . . . . . . . . . . . 14 (𝑤 = 𝑥 → ((𝐹𝑧) = (𝐹𝑤) ↔ (𝐹𝑧) = (𝐹𝑥)))
2625notbid 321 . . . . . . . . . . . . 13 (𝑤 = 𝑥 → (¬ (𝐹𝑧) = (𝐹𝑤) ↔ ¬ (𝐹𝑧) = (𝐹𝑥)))
2723, 26imbi12d 348 . . . . . . . . . . . 12 (𝑤 = 𝑥 → ((𝑤𝑧 → ¬ (𝐹𝑧) = (𝐹𝑤)) ↔ (𝑥𝑧 → ¬ (𝐹𝑧) = (𝐹𝑥))))
2827cbvralvw 3373 . . . . . . . . . . 11 (∀𝑤𝐴 (𝑤𝑧 → ¬ (𝐹𝑧) = (𝐹𝑤)) ↔ ∀𝑥𝐴 (𝑥𝑧 → ¬ (𝐹𝑧) = (𝐹𝑥)))
2928ralbii 3091 . . . . . . . . . 10 (∀𝑧𝐴𝑤𝐴 (𝑤𝑧 → ¬ (𝐹𝑧) = (𝐹𝑤)) ↔ ∀𝑧𝐴𝑥𝐴 (𝑥𝑧 → ¬ (𝐹𝑧) = (𝐹𝑥)))
30 elequ2 2127 . . . . . . . . . . . . 13 (𝑧 = 𝑦 → (𝑥𝑧𝑥𝑦))
31 fveqeq2 6748 . . . . . . . . . . . . . 14 (𝑧 = 𝑦 → ((𝐹𝑧) = (𝐹𝑥) ↔ (𝐹𝑦) = (𝐹𝑥)))
3231notbid 321 . . . . . . . . . . . . 13 (𝑧 = 𝑦 → (¬ (𝐹𝑧) = (𝐹𝑥) ↔ ¬ (𝐹𝑦) = (𝐹𝑥)))
3330, 32imbi12d 348 . . . . . . . . . . . 12 (𝑧 = 𝑦 → ((𝑥𝑧 → ¬ (𝐹𝑧) = (𝐹𝑥)) ↔ (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥))))
3433ralbidv 3121 . . . . . . . . . . 11 (𝑧 = 𝑦 → (∀𝑥𝐴 (𝑥𝑧 → ¬ (𝐹𝑧) = (𝐹𝑥)) ↔ ∀𝑥𝐴 (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥))))
3534cbvralvw 3373 . . . . . . . . . 10 (∀𝑧𝐴𝑥𝐴 (𝑥𝑧 → ¬ (𝐹𝑧) = (𝐹𝑥)) ↔ ∀𝑦𝐴𝑥𝐴 (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)))
3629, 35bitri 278 . . . . . . . . 9 (∀𝑧𝐴𝑤𝐴 (𝑤𝑧 → ¬ (𝐹𝑧) = (𝐹𝑤)) ↔ ∀𝑦𝐴𝑥𝐴 (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)))
3716, 22, 363bitri 300 . . . . . . . 8 (∀𝑥𝐴𝑦𝐴 (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)) ↔ ∀𝑦𝐴𝑥𝐴 (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)))
38 ralcom 3282 . . . . . . . . 9 (∀𝑦𝐴𝑥𝐴 (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ↔ ∀𝑥𝐴𝑦𝐴 (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)))
3938biimpi 219 . . . . . . . 8 (∀𝑦𝐴𝑥𝐴 (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) → ∀𝑥𝐴𝑦𝐴 (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)))
4037, 39sylbi 220 . . . . . . 7 (∀𝑥𝐴𝑦𝐴 (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)) → ∀𝑥𝐴𝑦𝐴 (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)))
4140ancri 553 . . . . . 6 (∀𝑥𝐴𝑦𝐴 (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)) → (∀𝑥𝐴𝑦𝐴 (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ ∀𝑥𝐴𝑦𝐴 (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))))
42 r19.26-2 3096 . . . . . 6 (∀𝑥𝐴𝑦𝐴 ((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))) ↔ (∀𝑥𝐴𝑦𝐴 (𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ ∀𝑥𝐴𝑦𝐴 (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))))
4341, 42sylibr 237 . . . . 5 (∀𝑥𝐴𝑦𝐴 (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)) → ∀𝑥𝐴𝑦𝐴 ((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))))
449, 43syl 17 . . . 4 (∀𝑥𝐴𝑦𝑥 ¬ (𝐹𝑥) = (𝐹𝑦) → ∀𝑥𝐴𝑦𝐴 ((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))))
45 fvres 6758 . . . . . . . . . . 11 (𝑥𝐴 → ((𝐹𝐴)‘𝑥) = (𝐹𝑥))
46 fvres 6758 . . . . . . . . . . 11 (𝑦𝐴 → ((𝐹𝐴)‘𝑦) = (𝐹𝑦))
4745, 46eqeqan12d 2753 . . . . . . . . . 10 ((𝑥𝐴𝑦𝐴) → (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) ↔ (𝐹𝑥) = (𝐹𝑦)))
4847ad2antrl 728 . . . . . . . . 9 ((𝐴 ⊆ On ∧ ((𝑥𝐴𝑦𝐴) ∧ ((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))))) → (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) ↔ (𝐹𝑥) = (𝐹𝑦)))
49 ssel 3910 . . . . . . . . . . . 12 (𝐴 ⊆ On → (𝑥𝐴𝑥 ∈ On))
50 ssel 3910 . . . . . . . . . . . 12 (𝐴 ⊆ On → (𝑦𝐴𝑦 ∈ On))
5149, 50anim12d 612 . . . . . . . . . . 11 (𝐴 ⊆ On → ((𝑥𝐴𝑦𝐴) → (𝑥 ∈ On ∧ 𝑦 ∈ On)))
52 pm3.48 964 . . . . . . . . . . . . . 14 (((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))) → ((𝑥𝑦𝑦𝑥) → (¬ (𝐹𝑦) = (𝐹𝑥) ∨ ¬ (𝐹𝑥) = (𝐹𝑦))))
53 oridm 905 . . . . . . . . . . . . . . 15 ((¬ (𝐹𝑥) = (𝐹𝑦) ∨ ¬ (𝐹𝑥) = (𝐹𝑦)) ↔ ¬ (𝐹𝑥) = (𝐹𝑦))
54 eqcom 2746 . . . . . . . . . . . . . . . . 17 ((𝐹𝑥) = (𝐹𝑦) ↔ (𝐹𝑦) = (𝐹𝑥))
5554notbii 323 . . . . . . . . . . . . . . . 16 (¬ (𝐹𝑥) = (𝐹𝑦) ↔ ¬ (𝐹𝑦) = (𝐹𝑥))
5655orbi1i 914 . . . . . . . . . . . . . . 15 ((¬ (𝐹𝑥) = (𝐹𝑦) ∨ ¬ (𝐹𝑥) = (𝐹𝑦)) ↔ (¬ (𝐹𝑦) = (𝐹𝑥) ∨ ¬ (𝐹𝑥) = (𝐹𝑦)))
5753, 56bitr3i 280 . . . . . . . . . . . . . 14 (¬ (𝐹𝑥) = (𝐹𝑦) ↔ (¬ (𝐹𝑦) = (𝐹𝑥) ∨ ¬ (𝐹𝑥) = (𝐹𝑦)))
5852, 57syl6ibr 255 . . . . . . . . . . . . 13 (((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))) → ((𝑥𝑦𝑦𝑥) → ¬ (𝐹𝑥) = (𝐹𝑦)))
5958con2d 136 . . . . . . . . . . . 12 (((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))) → ((𝐹𝑥) = (𝐹𝑦) → ¬ (𝑥𝑦𝑦𝑥)))
60 eloni 6244 . . . . . . . . . . . . 13 (𝑥 ∈ On → Ord 𝑥)
61 eloni 6244 . . . . . . . . . . . . 13 (𝑦 ∈ On → Ord 𝑦)
62 ordtri3 6270 . . . . . . . . . . . . . 14 ((Ord 𝑥 ∧ Ord 𝑦) → (𝑥 = 𝑦 ↔ ¬ (𝑥𝑦𝑦𝑥)))
6362biimprd 251 . . . . . . . . . . . . 13 ((Ord 𝑥 ∧ Ord 𝑦) → (¬ (𝑥𝑦𝑦𝑥) → 𝑥 = 𝑦))
6460, 61, 63syl2an 599 . . . . . . . . . . . 12 ((𝑥 ∈ On ∧ 𝑦 ∈ On) → (¬ (𝑥𝑦𝑦𝑥) → 𝑥 = 𝑦))
6559, 64syl9r 78 . . . . . . . . . . 11 ((𝑥 ∈ On ∧ 𝑦 ∈ On) → (((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))) → ((𝐹𝑥) = (𝐹𝑦) → 𝑥 = 𝑦)))
6651, 65syl6 35 . . . . . . . . . 10 (𝐴 ⊆ On → ((𝑥𝐴𝑦𝐴) → (((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))) → ((𝐹𝑥) = (𝐹𝑦) → 𝑥 = 𝑦))))
6766imp32 422 . . . . . . . . 9 ((𝐴 ⊆ On ∧ ((𝑥𝐴𝑦𝐴) ∧ ((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))))) → ((𝐹𝑥) = (𝐹𝑦) → 𝑥 = 𝑦))
6848, 67sylbid 243 . . . . . . . 8 ((𝐴 ⊆ On ∧ ((𝑥𝐴𝑦𝐴) ∧ ((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))))) → (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦))
6968exp32 424 . . . . . . 7 (𝐴 ⊆ On → ((𝑥𝐴𝑦𝐴) → (((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))) → (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦))))
7069a2d 29 . . . . . 6 (𝐴 ⊆ On → (((𝑥𝐴𝑦𝐴) → ((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)))) → ((𝑥𝐴𝑦𝐴) → (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦))))
71702alimdv 1926 . . . . 5 (𝐴 ⊆ On → (∀𝑥𝑦((𝑥𝐴𝑦𝐴) → ((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)))) → ∀𝑥𝑦((𝑥𝐴𝑦𝐴) → (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦))))
72 r2al 3125 . . . . 5 (∀𝑥𝐴𝑦𝐴 ((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))) ↔ ∀𝑥𝑦((𝑥𝐴𝑦𝐴) → ((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦)))))
73 r2al 3125 . . . . 5 (∀𝑥𝐴𝑦𝐴 (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦) ↔ ∀𝑥𝑦((𝑥𝐴𝑦𝐴) → (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦)))
7471, 72, 733imtr4g 299 . . . 4 (𝐴 ⊆ On → (∀𝑥𝐴𝑦𝐴 ((𝑥𝑦 → ¬ (𝐹𝑦) = (𝐹𝑥)) ∧ (𝑦𝑥 → ¬ (𝐹𝑥) = (𝐹𝑦))) → ∀𝑥𝐴𝑦𝐴 (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦)))
7544, 74syl5 34 . . 3 (𝐴 ⊆ On → (∀𝑥𝐴𝑦𝑥 ¬ (𝐹𝑥) = (𝐹𝑦) → ∀𝑥𝐴𝑦𝐴 (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦)))
7675imdistani 572 . 2 ((𝐴 ⊆ On ∧ ∀𝑥𝐴𝑦𝑥 ¬ (𝐹𝑥) = (𝐹𝑦)) → (𝐴 ⊆ On ∧ ∀𝑥𝐴𝑦𝐴 (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦)))
77 tz7.48.1 . . . 4 𝐹 Fn On
78 fnssres 6522 . . . 4 ((𝐹 Fn On ∧ 𝐴 ⊆ On) → (𝐹𝐴) Fn 𝐴)
7977, 78mpan 690 . . 3 (𝐴 ⊆ On → (𝐹𝐴) Fn 𝐴)
80 dffn2 6569 . . . 4 ((𝐹𝐴) Fn 𝐴 ↔ (𝐹𝐴):𝐴⟶V)
81 dff13 7089 . . . . . 6 ((𝐹𝐴):𝐴1-1→V ↔ ((𝐹𝐴):𝐴⟶V ∧ ∀𝑥𝐴𝑦𝐴 (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦)))
82 df-f1 6406 . . . . . 6 ((𝐹𝐴):𝐴1-1→V ↔ ((𝐹𝐴):𝐴⟶V ∧ Fun (𝐹𝐴)))
8381, 82bitr3i 280 . . . . 5 (((𝐹𝐴):𝐴⟶V ∧ ∀𝑥𝐴𝑦𝐴 (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦)) ↔ ((𝐹𝐴):𝐴⟶V ∧ Fun (𝐹𝐴)))
8483simprbi 500 . . . 4 (((𝐹𝐴):𝐴⟶V ∧ ∀𝑥𝐴𝑦𝐴 (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦)) → Fun (𝐹𝐴))
8580, 84sylanb 584 . . 3 (((𝐹𝐴) Fn 𝐴 ∧ ∀𝑥𝐴𝑦𝐴 (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦)) → Fun (𝐹𝐴))
8679, 85sylan 583 . 2 ((𝐴 ⊆ On ∧ ∀𝑥𝐴𝑦𝐴 (((𝐹𝐴)‘𝑥) = ((𝐹𝐴)‘𝑦) → 𝑥 = 𝑦)) → Fun (𝐹𝐴))
8776, 86syl 17 1 ((𝐴 ⊆ On ∧ ∀𝑥𝐴𝑦𝑥 ¬ (𝐹𝑥) = (𝐹𝑦)) → Fun (𝐹𝐴))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 209  wa 399  wo 847  wal 1541   = wceq 1543  wcel 2112  wral 3064  Vcvv 3423  wss 3883  ccnv 5568  cres 5571  Ord word 6233  Oncon0 6234  Fun wfun 6395   Fn wfn 6396  wf 6397  1-1wf1 6398  cfv 6401
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2016  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2160  ax-12 2177  ax-ext 2710  ax-sep 5209  ax-nul 5216  ax-pr 5339
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3or 1090  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2073  df-mo 2541  df-eu 2570  df-clab 2717  df-cleq 2731  df-clel 2818  df-nfc 2889  df-ne 2944  df-ral 3069  df-rex 3070  df-rab 3073  df-v 3425  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3902  df-nul 4255  df-if 4457  df-sn 4559  df-pr 4561  df-op 4565  df-uni 4837  df-br 5071  df-opab 5133  df-tr 5179  df-id 5472  df-eprel 5478  df-po 5486  df-so 5487  df-fr 5527  df-we 5529  df-xp 5575  df-rel 5576  df-cnv 5577  df-co 5578  df-dm 5579  df-res 5581  df-ord 6237  df-on 6238  df-iota 6359  df-fun 6403  df-fn 6404  df-f 6405  df-f1 6406  df-fv 6409
This theorem is referenced by:  tz7.48-2  8202  tz7.49  8205  zorn2lem4  10143
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