Mathbox for Glauco Siliprandi < Previous   Next > Nearby theorems Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  fnchoice Structured version   Visualization version   GIF version

Theorem fnchoice 41829
 Description: For a finite set, a choice function exists, without using the axiom of choice. (Contributed by Glauco Siliprandi, 20-Apr-2017.)
Assertion
Ref Expression
fnchoice (𝐴 ∈ Fin → ∃𝑓(𝑓 Fn 𝐴 ∧ ∀𝑥𝐴 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
Distinct variable group:   𝑥,𝑓,𝐴

Proof of Theorem fnchoice
Dummy variables 𝑔 𝑤 𝑦 𝑧 𝑢 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fneq2 6423 . . . 4 (𝑤 = ∅ → (𝑓 Fn 𝑤𝑓 Fn ∅))
2 raleq 3359 . . . 4 (𝑤 = ∅ → (∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥) ↔ ∀𝑥 ∈ ∅ (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
31, 2anbi12d 633 . . 3 (𝑤 = ∅ → ((𝑓 Fn 𝑤 ∧ ∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ↔ (𝑓 Fn ∅ ∧ ∀𝑥 ∈ ∅ (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
43exbidv 1922 . 2 (𝑤 = ∅ → (∃𝑓(𝑓 Fn 𝑤 ∧ ∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ↔ ∃𝑓(𝑓 Fn ∅ ∧ ∀𝑥 ∈ ∅ (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
5 fneq2 6423 . . . 4 (𝑤 = 𝑦 → (𝑓 Fn 𝑤𝑓 Fn 𝑦))
6 raleq 3359 . . . 4 (𝑤 = 𝑦 → (∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥) ↔ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
75, 6anbi12d 633 . . 3 (𝑤 = 𝑦 → ((𝑓 Fn 𝑤 ∧ ∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ↔ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
87exbidv 1922 . 2 (𝑤 = 𝑦 → (∃𝑓(𝑓 Fn 𝑤 ∧ ∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ↔ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
9 fneq2 6423 . . . 4 (𝑤 = (𝑦 ∪ {𝑧}) → (𝑓 Fn 𝑤𝑓 Fn (𝑦 ∪ {𝑧})))
10 raleq 3359 . . . 4 (𝑤 = (𝑦 ∪ {𝑧}) → (∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥) ↔ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
119, 10anbi12d 633 . . 3 (𝑤 = (𝑦 ∪ {𝑧}) → ((𝑓 Fn 𝑤 ∧ ∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ↔ (𝑓 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
1211exbidv 1922 . 2 (𝑤 = (𝑦 ∪ {𝑧}) → (∃𝑓(𝑓 Fn 𝑤 ∧ ∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ↔ ∃𝑓(𝑓 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
13 fneq2 6423 . . . 4 (𝑤 = 𝐴 → (𝑓 Fn 𝑤𝑓 Fn 𝐴))
14 raleq 3359 . . . 4 (𝑤 = 𝐴 → (∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥) ↔ ∀𝑥𝐴 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
1513, 14anbi12d 633 . . 3 (𝑤 = 𝐴 → ((𝑓 Fn 𝑤 ∧ ∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ↔ (𝑓 Fn 𝐴 ∧ ∀𝑥𝐴 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
1615exbidv 1922 . 2 (𝑤 = 𝐴 → (∃𝑓(𝑓 Fn 𝑤 ∧ ∀𝑥𝑤 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ↔ ∃𝑓(𝑓 Fn 𝐴 ∧ ∀𝑥𝐴 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
17 0ex 5179 . . . 4 ∅ ∈ V
18 fneq1 6422 . . . 4 (𝑓 = ∅ → (𝑓 Fn ∅ ↔ ∅ Fn ∅))
19 eqid 2798 . . . . 5 ∅ = ∅
20 fn0 6459 . . . . 5 (∅ Fn ∅ ↔ ∅ = ∅)
2119, 20mpbir 234 . . . 4 ∅ Fn ∅
2217, 18, 21ceqsexv2d 3491 . . 3 𝑓 𝑓 Fn ∅
23 ral0 4417 . . 3 𝑥 ∈ ∅ (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)
2422, 23exan 1863 . 2 𝑓(𝑓 Fn ∅ ∧ ∀𝑥 ∈ ∅ (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))
25 dffn2 6497 . . . . . . . . . . . . . . . 16 (𝑓 Fn 𝑦𝑓:𝑦⟶V)
2625biimpi 219 . . . . . . . . . . . . . . 15 (𝑓 Fn 𝑦𝑓:𝑦⟶V)
2726ad2antrl 727 . . . . . . . . . . . . . 14 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → 𝑓:𝑦⟶V)
28 vex 3445 . . . . . . . . . . . . . . 15 𝑧 ∈ V
2928a1i 11 . . . . . . . . . . . . . 14 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → 𝑧 ∈ V)
30 simpllr 775 . . . . . . . . . . . . . 14 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → ¬ 𝑧𝑦)
31 vex 3445 . . . . . . . . . . . . . . 15 𝑤 ∈ V
3231a1i 11 . . . . . . . . . . . . . 14 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → 𝑤 ∈ V)
33 fsnunf 6934 . . . . . . . . . . . . . 14 ((𝑓:𝑦⟶V ∧ (𝑧 ∈ V ∧ ¬ 𝑧𝑦) ∧ 𝑤 ∈ V) → (𝑓 ∪ {⟨𝑧, 𝑤⟩}):(𝑦 ∪ {𝑧})⟶V)
3427, 29, 30, 32, 33syl121anc 1372 . . . . . . . . . . . . 13 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → (𝑓 ∪ {⟨𝑧, 𝑤⟩}):(𝑦 ∪ {𝑧})⟶V)
35 dffn2 6497 . . . . . . . . . . . . 13 ((𝑓 ∪ {⟨𝑧, 𝑤⟩}) Fn (𝑦 ∪ {𝑧}) ↔ (𝑓 ∪ {⟨𝑧, 𝑤⟩}):(𝑦 ∪ {𝑧})⟶V)
3634, 35sylibr 237 . . . . . . . . . . . 12 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → (𝑓 ∪ {⟨𝑧, 𝑤⟩}) Fn (𝑦 ∪ {𝑧}))
37 simplr 768 . . . . . . . . . . . . 13 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → 𝑧 = ∅)
38 simprr 772 . . . . . . . . . . . . 13 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))
39 nfv 1915 . . . . . . . . . . . . . . 15 𝑥(𝑧 = ∅ ∧ ¬ 𝑧𝑦)
40 nfra1 3183 . . . . . . . . . . . . . . 15 𝑥𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)
4139, 40nfan 1900 . . . . . . . . . . . . . 14 𝑥((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))
42 simpr 488 . . . . . . . . . . . . . . . . . . . . 21 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → 𝑥𝑦)
43 simpllr 775 . . . . . . . . . . . . . . . . . . . . . . 23 ((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) → ¬ 𝑧𝑦)
4443adantr 484 . . . . . . . . . . . . . . . . . . . . . 22 (((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) → ¬ 𝑧𝑦)
4544adantr 484 . . . . . . . . . . . . . . . . . . . . 21 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → ¬ 𝑧𝑦)
4642, 45jca 515 . . . . . . . . . . . . . . . . . . . 20 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → (𝑥𝑦 ∧ ¬ 𝑧𝑦))
47 nelne2 3084 . . . . . . . . . . . . . . . . . . . . 21 ((𝑥𝑦 ∧ ¬ 𝑧𝑦) → 𝑥𝑧)
4847necomd 3042 . . . . . . . . . . . . . . . . . . . 20 ((𝑥𝑦 ∧ ¬ 𝑧𝑦) → 𝑧𝑥)
4946, 48syl 17 . . . . . . . . . . . . . . . . . . 19 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → 𝑧𝑥)
50 fvunsn 6928 . . . . . . . . . . . . . . . . . . 19 (𝑧𝑥 → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) = (𝑓𝑥))
5149, 50syl 17 . . . . . . . . . . . . . . . . . 18 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) = (𝑓𝑥))
52 simpllr 775 . . . . . . . . . . . . . . . . . . . 20 (((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) → ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))
5352adantr 484 . . . . . . . . . . . . . . . . . . 19 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))
54 simplr 768 . . . . . . . . . . . . . . . . . . 19 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → 𝑥 ≠ ∅)
55 neeq1 3049 . . . . . . . . . . . . . . . . . . . . . 22 (𝑢 = 𝑥 → (𝑢 ≠ ∅ ↔ 𝑥 ≠ ∅))
56 fveq2 6655 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑢 = 𝑥 → (𝑓𝑢) = (𝑓𝑥))
5756eleq1d 2874 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑢 = 𝑥 → ((𝑓𝑢) ∈ 𝑢 ↔ (𝑓𝑥) ∈ 𝑢))
58 eleq2w 2873 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑢 = 𝑥 → ((𝑓𝑥) ∈ 𝑢 ↔ (𝑓𝑥) ∈ 𝑥))
5957, 58bitrd 282 . . . . . . . . . . . . . . . . . . . . . 22 (𝑢 = 𝑥 → ((𝑓𝑢) ∈ 𝑢 ↔ (𝑓𝑥) ∈ 𝑥))
6055, 59imbi12d 348 . . . . . . . . . . . . . . . . . . . . 21 (𝑢 = 𝑥 → ((𝑢 ≠ ∅ → (𝑓𝑢) ∈ 𝑢) ↔ (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
6160cbvralvw 3397 . . . . . . . . . . . . . . . . . . . 20 (∀𝑢𝑦 (𝑢 ≠ ∅ → (𝑓𝑢) ∈ 𝑢) ↔ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))
6260rspcv 3567 . . . . . . . . . . . . . . . . . . . 20 (𝑥𝑦 → (∀𝑢𝑦 (𝑢 ≠ ∅ → (𝑓𝑢) ∈ 𝑢) → (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
6361, 62syl5bir 246 . . . . . . . . . . . . . . . . . . 19 (𝑥𝑦 → (∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥) → (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
6442, 53, 54, 63syl3c 66 . . . . . . . . . . . . . . . . . 18 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → (𝑓𝑥) ∈ 𝑥)
6551, 64eqeltrd 2890 . . . . . . . . . . . . . . . . 17 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)
66 simp-4l 782 . . . . . . . . . . . . . . . . . . 19 (((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) → 𝑧 = ∅)
6766adantr 484 . . . . . . . . . . . . . . . . . 18 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → 𝑧 = ∅)
68 simpr 488 . . . . . . . . . . . . . . . . . 18 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → 𝑥 ∈ {𝑧})
69 simplr 768 . . . . . . . . . . . . . . . . . 18 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → 𝑥 ≠ ∅)
70 elsni 4545 . . . . . . . . . . . . . . . . . . . . 21 (𝑥 ∈ {𝑧} → 𝑥 = 𝑧)
71703ad2ant2 1131 . . . . . . . . . . . . . . . . . . . 20 ((𝑧 = ∅ ∧ 𝑥 ∈ {𝑧} ∧ 𝑥 ≠ ∅) → 𝑥 = 𝑧)
72 simp1 1133 . . . . . . . . . . . . . . . . . . . 20 ((𝑧 = ∅ ∧ 𝑥 ∈ {𝑧} ∧ 𝑥 ≠ ∅) → 𝑧 = ∅)
7371, 72eqtrd 2833 . . . . . . . . . . . . . . . . . . 19 ((𝑧 = ∅ ∧ 𝑥 ∈ {𝑧} ∧ 𝑥 ≠ ∅) → 𝑥 = ∅)
74 simp3 1135 . . . . . . . . . . . . . . . . . . 19 ((𝑧 = ∅ ∧ 𝑥 ∈ {𝑧} ∧ 𝑥 ≠ ∅) → 𝑥 ≠ ∅)
7573, 74pm2.21ddne 3071 . . . . . . . . . . . . . . . . . 18 ((𝑧 = ∅ ∧ 𝑥 ∈ {𝑧} ∧ 𝑥 ≠ ∅) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)
7667, 68, 69, 75syl3anc 1368 . . . . . . . . . . . . . . . . 17 ((((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)
77 simplr 768 . . . . . . . . . . . . . . . . . 18 (((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) → 𝑥 ∈ (𝑦 ∪ {𝑧}))
78 elun 4079 . . . . . . . . . . . . . . . . . 18 (𝑥 ∈ (𝑦 ∪ {𝑧}) ↔ (𝑥𝑦𝑥 ∈ {𝑧}))
7977, 78sylib 221 . . . . . . . . . . . . . . . . 17 (((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) → (𝑥𝑦𝑥 ∈ {𝑧}))
8065, 76, 79mpjaodan 956 . . . . . . . . . . . . . . . 16 (((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)
8180ex 416 . . . . . . . . . . . . . . 15 ((((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) → (𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥))
8281ex 416 . . . . . . . . . . . . . 14 (((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) → (𝑥 ∈ (𝑦 ∪ {𝑧}) → (𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)))
8341, 82ralrimi 3180 . . . . . . . . . . . . 13 (((𝑧 = ∅ ∧ ¬ 𝑧𝑦) ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) → ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥))
8437, 30, 38, 83syl21anc 836 . . . . . . . . . . . 12 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥))
8536, 84jca 515 . . . . . . . . . . 11 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩}) Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)))
8685ex 416 . . . . . . . . . 10 (((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) → ((𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩}) Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥))))
8786eximdv 1918 . . . . . . . . 9 (((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) → (∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) → ∃𝑓((𝑓 ∪ {⟨𝑧, 𝑤⟩}) Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥))))
88 vex 3445 . . . . . . . . . . . 12 𝑓 ∈ V
89 snex 5301 . . . . . . . . . . . 12 {⟨𝑧, 𝑤⟩} ∈ V
9088, 89unex 7462 . . . . . . . . . . 11 (𝑓 ∪ {⟨𝑧, 𝑤⟩}) ∈ V
91 fneq1 6422 . . . . . . . . . . . 12 (𝑔 = (𝑓 ∪ {⟨𝑧, 𝑤⟩}) → (𝑔 Fn (𝑦 ∪ {𝑧}) ↔ (𝑓 ∪ {⟨𝑧, 𝑤⟩}) Fn (𝑦 ∪ {𝑧})))
92 fveq1 6654 . . . . . . . . . . . . . . 15 (𝑔 = (𝑓 ∪ {⟨𝑧, 𝑤⟩}) → (𝑔𝑥) = ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥))
9392eleq1d 2874 . . . . . . . . . . . . . 14 (𝑔 = (𝑓 ∪ {⟨𝑧, 𝑤⟩}) → ((𝑔𝑥) ∈ 𝑥 ↔ ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥))
9493imbi2d 344 . . . . . . . . . . . . 13 (𝑔 = (𝑓 ∪ {⟨𝑧, 𝑤⟩}) → ((𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥) ↔ (𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)))
9594ralbidv 3162 . . . . . . . . . . . 12 (𝑔 = (𝑓 ∪ {⟨𝑧, 𝑤⟩}) → (∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥) ↔ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)))
9691, 95anbi12d 633 . . . . . . . . . . 11 (𝑔 = (𝑓 ∪ {⟨𝑧, 𝑤⟩}) → ((𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)) ↔ ((𝑓 ∪ {⟨𝑧, 𝑤⟩}) Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥))))
9790, 96spcev 3556 . . . . . . . . . 10 (((𝑓 ∪ {⟨𝑧, 𝑤⟩}) Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)) → ∃𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
9897eximi 1836 . . . . . . . . 9 (∃𝑓((𝑓 ∪ {⟨𝑧, 𝑤⟩}) Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)) → ∃𝑓𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
9987, 98syl6 35 . . . . . . . 8 (((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) → (∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) → ∃𝑓𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥))))
100 ax5e 1913 . . . . . . . 8 (∃𝑓𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)) → ∃𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
10199, 100syl6 35 . . . . . . 7 (((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) → (∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) → ∃𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥))))
102101imp 410 . . . . . 6 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ 𝑧 = ∅) ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → ∃𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
103102an32s 651 . . . . 5 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) ∧ 𝑧 = ∅) → ∃𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
104 fneq1 6422 . . . . . . 7 (𝑓 = 𝑔 → (𝑓 Fn (𝑦 ∪ {𝑧}) ↔ 𝑔 Fn (𝑦 ∪ {𝑧})))
105 fveq1 6654 . . . . . . . . . 10 (𝑓 = 𝑔 → (𝑓𝑥) = (𝑔𝑥))
106105eleq1d 2874 . . . . . . . . 9 (𝑓 = 𝑔 → ((𝑓𝑥) ∈ 𝑥 ↔ (𝑔𝑥) ∈ 𝑥))
107106imbi2d 344 . . . . . . . 8 (𝑓 = 𝑔 → ((𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥) ↔ (𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
108107ralbidv 3162 . . . . . . 7 (𝑓 = 𝑔 → (∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥) ↔ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
109104, 108anbi12d 633 . . . . . 6 (𝑓 = 𝑔 → ((𝑓 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ↔ (𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥))))
110109cbvexvw 2044 . . . . 5 (∃𝑓(𝑓 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) ↔ ∃𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
111103, 110sylibr 237 . . . 4 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) ∧ 𝑧 = ∅) → ∃𝑓(𝑓 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
112 simpllr 775 . . . . . 6 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) ∧ ¬ 𝑧 = ∅) → ¬ 𝑧𝑦)
113 simpr 488 . . . . . . . 8 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) ∧ ¬ 𝑧 = ∅) → ¬ 𝑧 = ∅)
114 neq0 4262 . . . . . . . 8 𝑧 = ∅ ↔ ∃𝑤 𝑤𝑧)
115113, 114sylib 221 . . . . . . 7 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) ∧ ¬ 𝑧 = ∅) → ∃𝑤 𝑤𝑧)
116 simplr 768 . . . . . . 7 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) ∧ ¬ 𝑧 = ∅) → ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
117115, 116jca 515 . . . . . 6 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) ∧ ¬ 𝑧 = ∅) → (∃𝑤 𝑤𝑧 ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
118112, 117jca 515 . . . . 5 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) ∧ ¬ 𝑧 = ∅) → (¬ 𝑧𝑦 ∧ (∃𝑤 𝑤𝑧 ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))))
119 exdistrv 1956 . . . . . . . . 9 (∃𝑤𝑓(𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) ↔ (∃𝑤 𝑤𝑧 ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
120 simprrl 780 . . . . . . . . . . . . . . . 16 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → 𝑓 Fn 𝑦)
121120, 25sylib 221 . . . . . . . . . . . . . . 15 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → 𝑓:𝑦⟶V)
12228a1i 11 . . . . . . . . . . . . . . 15 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → 𝑧 ∈ V)
123 simpl 486 . . . . . . . . . . . . . . 15 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → ¬ 𝑧𝑦)
12431a1i 11 . . . . . . . . . . . . . . 15 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → 𝑤 ∈ V)
125121, 122, 123, 124, 33syl121anc 1372 . . . . . . . . . . . . . 14 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → (𝑓 ∪ {⟨𝑧, 𝑤⟩}):(𝑦 ∪ {𝑧})⟶V)
126125, 35sylibr 237 . . . . . . . . . . . . 13 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → (𝑓 ∪ {⟨𝑧, 𝑤⟩}) Fn (𝑦 ∪ {𝑧}))
127 nfv 1915 . . . . . . . . . . . . . . 15 𝑥 ¬ 𝑧𝑦
128 nfv 1915 . . . . . . . . . . . . . . . 16 𝑥 𝑤𝑧
129 nfv 1915 . . . . . . . . . . . . . . . . 17 𝑥 𝑓 Fn 𝑦
130129, 40nfan 1900 . . . . . . . . . . . . . . . 16 𝑥(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))
131128, 130nfan 1900 . . . . . . . . . . . . . . 15 𝑥(𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
132127, 131nfan 1900 . . . . . . . . . . . . . 14 𝑥𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
133 simpr 488 . . . . . . . . . . . . . . . . . . . 20 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → 𝑥𝑦)
134 simp-4l 782 . . . . . . . . . . . . . . . . . . . 20 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → ¬ 𝑧𝑦)
135133, 134jca 515 . . . . . . . . . . . . . . . . . . 19 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → (𝑥𝑦 ∧ ¬ 𝑧𝑦))
13648, 50syl 17 . . . . . . . . . . . . . . . . . . 19 ((𝑥𝑦 ∧ ¬ 𝑧𝑦) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) = (𝑓𝑥))
137135, 136syl 17 . . . . . . . . . . . . . . . . . 18 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) = (𝑓𝑥))
138 simprrr 781 . . . . . . . . . . . . . . . . . . . 20 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))
139138ad5ant12 755 . . . . . . . . . . . . . . . . . . 19 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))
140 simplr 768 . . . . . . . . . . . . . . . . . . 19 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → 𝑥 ≠ ∅)
141133, 139, 140, 63syl3c 66 . . . . . . . . . . . . . . . . . 18 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → (𝑓𝑥) ∈ 𝑥)
142137, 141eqeltrd 2890 . . . . . . . . . . . . . . . . 17 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥𝑦) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)
143 simplrl 776 . . . . . . . . . . . . . . . . . . . 20 (((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) → 𝑤𝑧)
144143adantr 484 . . . . . . . . . . . . . . . . . . 19 ((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) → 𝑤𝑧)
145144adantr 484 . . . . . . . . . . . . . . . . . 18 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → 𝑤𝑧)
146 simpr 488 . . . . . . . . . . . . . . . . . . . . 21 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → 𝑥 ∈ {𝑧})
147146, 70syl 17 . . . . . . . . . . . . . . . . . . . 20 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → 𝑥 = 𝑧)
148 fveq2 6655 . . . . . . . . . . . . . . . . . . . 20 (𝑥 = 𝑧 → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) = ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑧))
149147, 148syl 17 . . . . . . . . . . . . . . . . . . 19 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) = ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑧))
15028a1i 11 . . . . . . . . . . . . . . . . . . . 20 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → 𝑧 ∈ V)
15131a1i 11 . . . . . . . . . . . . . . . . . . . 20 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → 𝑤 ∈ V)
152 simp-4l 782 . . . . . . . . . . . . . . . . . . . . 21 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → ¬ 𝑧𝑦)
153120ad5ant12 755 . . . . . . . . . . . . . . . . . . . . . 22 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → 𝑓 Fn 𝑦)
154153fndmd 6435 . . . . . . . . . . . . . . . . . . . . 21 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → dom 𝑓 = 𝑦)
155152, 154neleqtrrd 2912 . . . . . . . . . . . . . . . . . . . 20 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → ¬ 𝑧 ∈ dom 𝑓)
156 fsnunfv 6936 . . . . . . . . . . . . . . . . . . . 20 ((𝑧 ∈ V ∧ 𝑤 ∈ V ∧ ¬ 𝑧 ∈ dom 𝑓) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑧) = 𝑤)
157150, 151, 155, 156syl3anc 1368 . . . . . . . . . . . . . . . . . . 19 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑧) = 𝑤)
158149, 157eqtrd 2833 . . . . . . . . . . . . . . . . . 18 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) = 𝑤)
159145, 158, 1473eltr4d 2905 . . . . . . . . . . . . . . . . 17 (((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) ∧ 𝑥 ∈ {𝑧}) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)
160 simplr 768 . . . . . . . . . . . . . . . . . 18 ((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) → 𝑥 ∈ (𝑦 ∪ {𝑧}))
161160, 78sylib 221 . . . . . . . . . . . . . . . . 17 ((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) → (𝑥𝑦𝑥 ∈ {𝑧}))
162142, 159, 161mpjaodan 956 . . . . . . . . . . . . . . . 16 ((((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) ∧ 𝑥 ≠ ∅) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)
163162ex 416 . . . . . . . . . . . . . . 15 (((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) ∧ 𝑥 ∈ (𝑦 ∪ {𝑧})) → (𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥))
164163ex 416 . . . . . . . . . . . . . 14 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → (𝑥 ∈ (𝑦 ∪ {𝑧}) → (𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)))
165132, 164ralrimi 3180 . . . . . . . . . . . . 13 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥))
166126, 165jca 515 . . . . . . . . . . . 12 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → ((𝑓 ∪ {⟨𝑧, 𝑤⟩}) Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → ((𝑓 ∪ {⟨𝑧, 𝑤⟩})‘𝑥) ∈ 𝑥)))
167166, 97syl 17 . . . . . . . . . . 11 ((¬ 𝑧𝑦 ∧ (𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → ∃𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
168167ex 416 . . . . . . . . . 10 𝑧𝑦 → ((𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → ∃𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥))))
1691682eximdv 1920 . . . . . . . . 9 𝑧𝑦 → (∃𝑤𝑓(𝑤𝑧 ∧ (𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → ∃𝑤𝑓𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥))))
170119, 169syl5bir 246 . . . . . . . 8 𝑧𝑦 → ((∃𝑤 𝑤𝑧 ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → ∃𝑤𝑓𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥))))
171170imp 410 . . . . . . 7 ((¬ 𝑧𝑦 ∧ (∃𝑤 𝑤𝑧 ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → ∃𝑤𝑓𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
172100exlimiv 1931 . . . . . . 7 (∃𝑤𝑓𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)) → ∃𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
173171, 172syl 17 . . . . . 6 ((¬ 𝑧𝑦 ∧ (∃𝑤 𝑤𝑧 ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → ∃𝑔(𝑔 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑔𝑥) ∈ 𝑥)))
174173, 110sylibr 237 . . . . 5 ((¬ 𝑧𝑦 ∧ (∃𝑤 𝑤𝑧 ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))) → ∃𝑓(𝑓 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
175118, 174syl 17 . . . 4 ((((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) ∧ ¬ 𝑧 = ∅) → ∃𝑓(𝑓 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
176111, 175pm2.61dan 812 . . 3 (((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) ∧ ∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))) → ∃𝑓(𝑓 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
177176ex 416 . 2 ((𝑦 ∈ Fin ∧ ¬ 𝑧𝑦) → (∃𝑓(𝑓 Fn 𝑦 ∧ ∀𝑥𝑦 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)) → ∃𝑓(𝑓 Fn (𝑦 ∪ {𝑧}) ∧ ∀𝑥 ∈ (𝑦 ∪ {𝑧})(𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥))))
1784, 8, 12, 16, 24, 177findcard2s 8761 1 (𝐴 ∈ Fin → ∃𝑓(𝑓 Fn 𝐴 ∧ ∀𝑥𝐴 (𝑥 ≠ ∅ → (𝑓𝑥) ∈ 𝑥)))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 399   ∨ wo 844   ∧ w3a 1084   = wceq 1538  ∃wex 1781   ∈ wcel 2111   ≠ wne 2987  ∀wral 3106  Vcvv 3442   ∪ cun 3881  ∅c0 4246  {csn 4528  ⟨cop 4534  dom cdm 5523   Fn wfn 6327  ⟶wf 6328  ‘cfv 6332  Fincfn 8510 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5171  ax-nul 5178  ax-pow 5235  ax-pr 5299  ax-un 7454 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ne 2988  df-ral 3111  df-rex 3112  df-rab 3115  df-v 3444  df-sbc 3723  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3902  df-nul 4247  df-if 4429  df-pw 4502  df-sn 4529  df-pr 4531  df-tp 4533  df-op 4535  df-uni 4805  df-br 5035  df-opab 5097  df-tr 5141  df-id 5429  df-eprel 5434  df-po 5442  df-so 5443  df-fr 5482  df-we 5484  df-xp 5529  df-rel 5530  df-cnv 5531  df-co 5532  df-dm 5533  df-rn 5534  df-res 5535  df-ima 5536  df-ord 6169  df-on 6170  df-lim 6171  df-suc 6172  df-iota 6291  df-fun 6334  df-fn 6335  df-f 6336  df-f1 6337  df-fo 6338  df-f1o 6339  df-fv 6340  df-om 7574  df-1o 8103  df-er 8290  df-en 8511  df-fin 8514 This theorem is referenced by:  choicefi  41999  stoweidlem31  42841  stoweidlem35  42845  stoweidlem59  42869
 Copyright terms: Public domain W3C validator