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Theorem onfununi 7599
Description: A property of functions on ordinal numbers. Generalization of Theorem Schema 8E of [Enderton] p. 218. (Contributed by Eric Schmidt, 26-May-2009.)
Hypotheses
Ref Expression
onfununi.1 (Lim 𝑦 → (𝐹𝑦) = 𝑥𝑦 (𝐹𝑥))
onfununi.2 ((𝑥 ∈ On ∧ 𝑦 ∈ On ∧ 𝑥𝑦) → (𝐹𝑥) ⊆ (𝐹𝑦))
Assertion
Ref Expression
onfununi ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝐹 𝑆) = 𝑥𝑆 (𝐹𝑥))
Distinct variable groups:   𝑥,𝑦,𝑆   𝑥,𝐹,𝑦   𝑥,𝑇
Allowed substitution hint:   𝑇(𝑦)

Proof of Theorem onfununi
StepHypRef Expression
1 ssorduni 7142 . . . . . . . . . 10 (𝑆 ⊆ On → Ord 𝑆)
21ad2antrr 764 . . . . . . . . 9 (((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) ∧ 𝑆 ≠ ∅) → Ord 𝑆)
3 nelneq 2855 . . . . . . . . . . . . . . . 16 ((𝑥𝑆 ∧ ¬ 𝑆𝑆) → ¬ 𝑥 = 𝑆)
4 elssuni 4611 . . . . . . . . . . . . . . . . . . . 20 (𝑥𝑆𝑥 𝑆)
54adantl 473 . . . . . . . . . . . . . . . . . . 19 ((𝑆 ⊆ On ∧ 𝑥𝑆) → 𝑥 𝑆)
6 ssel 3730 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑆 ⊆ On → (𝑥𝑆𝑥 ∈ On))
7 eloni 5886 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑥 ∈ On → Ord 𝑥)
86, 7syl6 35 . . . . . . . . . . . . . . . . . . . . . 22 (𝑆 ⊆ On → (𝑥𝑆 → Ord 𝑥))
98imp 444 . . . . . . . . . . . . . . . . . . . . 21 ((𝑆 ⊆ On ∧ 𝑥𝑆) → Ord 𝑥)
10 ordsseleq 5905 . . . . . . . . . . . . . . . . . . . . 21 ((Ord 𝑥 ∧ Ord 𝑆) → (𝑥 𝑆 ↔ (𝑥 𝑆𝑥 = 𝑆)))
119, 1, 10syl2an 495 . . . . . . . . . . . . . . . . . . . 20 (((𝑆 ⊆ On ∧ 𝑥𝑆) ∧ 𝑆 ⊆ On) → (𝑥 𝑆 ↔ (𝑥 𝑆𝑥 = 𝑆)))
1211anabss1 890 . . . . . . . . . . . . . . . . . . 19 ((𝑆 ⊆ On ∧ 𝑥𝑆) → (𝑥 𝑆 ↔ (𝑥 𝑆𝑥 = 𝑆)))
135, 12mpbid 222 . . . . . . . . . . . . . . . . . 18 ((𝑆 ⊆ On ∧ 𝑥𝑆) → (𝑥 𝑆𝑥 = 𝑆))
1413ord 391 . . . . . . . . . . . . . . . . 17 ((𝑆 ⊆ On ∧ 𝑥𝑆) → (¬ 𝑥 𝑆𝑥 = 𝑆))
1514con1d 139 . . . . . . . . . . . . . . . 16 ((𝑆 ⊆ On ∧ 𝑥𝑆) → (¬ 𝑥 = 𝑆𝑥 𝑆))
163, 15syl5 34 . . . . . . . . . . . . . . 15 ((𝑆 ⊆ On ∧ 𝑥𝑆) → ((𝑥𝑆 ∧ ¬ 𝑆𝑆) → 𝑥 𝑆))
1716exp4b 633 . . . . . . . . . . . . . 14 (𝑆 ⊆ On → (𝑥𝑆 → (𝑥𝑆 → (¬ 𝑆𝑆𝑥 𝑆))))
1817pm2.43d 53 . . . . . . . . . . . . 13 (𝑆 ⊆ On → (𝑥𝑆 → (¬ 𝑆𝑆𝑥 𝑆)))
1918com23 86 . . . . . . . . . . . 12 (𝑆 ⊆ On → (¬ 𝑆𝑆 → (𝑥𝑆𝑥 𝑆)))
2019imp 444 . . . . . . . . . . 11 ((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) → (𝑥𝑆𝑥 𝑆))
2120ssrdv 3742 . . . . . . . . . 10 ((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) → 𝑆 𝑆)
22 ssn0 4111 . . . . . . . . . 10 ((𝑆 𝑆𝑆 ≠ ∅) → 𝑆 ≠ ∅)
2321, 22sylan 489 . . . . . . . . 9 (((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) ∧ 𝑆 ≠ ∅) → 𝑆 ≠ ∅)
2421unissd 4606 . . . . . . . . . . 11 ((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) → 𝑆 𝑆)
25 orduniss 5974 . . . . . . . . . . . . 13 (Ord 𝑆 𝑆 𝑆)
261, 25syl 17 . . . . . . . . . . . 12 (𝑆 ⊆ On → 𝑆 𝑆)
2726adantr 472 . . . . . . . . . . 11 ((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) → 𝑆 𝑆)
2824, 27eqssd 3753 . . . . . . . . . 10 ((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) → 𝑆 = 𝑆)
2928adantr 472 . . . . . . . . 9 (((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) ∧ 𝑆 ≠ ∅) → 𝑆 = 𝑆)
30 df-lim 5881 . . . . . . . . 9 (Lim 𝑆 ↔ (Ord 𝑆 𝑆 ≠ ∅ ∧ 𝑆 = 𝑆))
312, 23, 29, 30syl3anbrc 1426 . . . . . . . 8 (((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) ∧ 𝑆 ≠ ∅) → Lim 𝑆)
3231an32s 881 . . . . . . 7 (((𝑆 ⊆ On ∧ 𝑆 ≠ ∅) ∧ ¬ 𝑆𝑆) → Lim 𝑆)
33323adantl1 1169 . . . . . 6 (((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) ∧ ¬ 𝑆𝑆) → Lim 𝑆)
34 ssonuni 7143 . . . . . . . . . 10 (𝑆𝑇 → (𝑆 ⊆ On → 𝑆 ∈ On))
35 limeq 5888 . . . . . . . . . . . 12 (𝑦 = 𝑆 → (Lim 𝑦 ↔ Lim 𝑆))
36 fveq2 6344 . . . . . . . . . . . . 13 (𝑦 = 𝑆 → (𝐹𝑦) = (𝐹 𝑆))
37 iuneq1 4678 . . . . . . . . . . . . 13 (𝑦 = 𝑆 𝑥𝑦 (𝐹𝑥) = 𝑥 𝑆(𝐹𝑥))
3836, 37eqeq12d 2767 . . . . . . . . . . . 12 (𝑦 = 𝑆 → ((𝐹𝑦) = 𝑥𝑦 (𝐹𝑥) ↔ (𝐹 𝑆) = 𝑥 𝑆(𝐹𝑥)))
3935, 38imbi12d 333 . . . . . . . . . . 11 (𝑦 = 𝑆 → ((Lim 𝑦 → (𝐹𝑦) = 𝑥𝑦 (𝐹𝑥)) ↔ (Lim 𝑆 → (𝐹 𝑆) = 𝑥 𝑆(𝐹𝑥))))
40 onfununi.1 . . . . . . . . . . 11 (Lim 𝑦 → (𝐹𝑦) = 𝑥𝑦 (𝐹𝑥))
4139, 40vtoclg 3398 . . . . . . . . . 10 ( 𝑆 ∈ On → (Lim 𝑆 → (𝐹 𝑆) = 𝑥 𝑆(𝐹𝑥)))
4234, 41syl6 35 . . . . . . . . 9 (𝑆𝑇 → (𝑆 ⊆ On → (Lim 𝑆 → (𝐹 𝑆) = 𝑥 𝑆(𝐹𝑥))))
4342imp 444 . . . . . . . 8 ((𝑆𝑇𝑆 ⊆ On) → (Lim 𝑆 → (𝐹 𝑆) = 𝑥 𝑆(𝐹𝑥)))
44433adant3 1126 . . . . . . 7 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (Lim 𝑆 → (𝐹 𝑆) = 𝑥 𝑆(𝐹𝑥)))
4544adantr 472 . . . . . 6 (((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) ∧ ¬ 𝑆𝑆) → (Lim 𝑆 → (𝐹 𝑆) = 𝑥 𝑆(𝐹𝑥)))
4633, 45mpd 15 . . . . 5 (((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) ∧ ¬ 𝑆𝑆) → (𝐹 𝑆) = 𝑥 𝑆(𝐹𝑥))
47 eluni2 4584 . . . . . . . . . . . 12 (𝑥 𝑆 ↔ ∃𝑦𝑆 𝑥𝑦)
48 ssel 3730 . . . . . . . . . . . . . . . . . 18 (𝑆 ⊆ On → (𝑦𝑆𝑦 ∈ On))
4948anim1d 589 . . . . . . . . . . . . . . . . 17 (𝑆 ⊆ On → ((𝑦𝑆𝑥𝑦) → (𝑦 ∈ On ∧ 𝑥𝑦)))
50 onelon 5901 . . . . . . . . . . . . . . . . 17 ((𝑦 ∈ On ∧ 𝑥𝑦) → 𝑥 ∈ On)
5149, 50syl6 35 . . . . . . . . . . . . . . . 16 (𝑆 ⊆ On → ((𝑦𝑆𝑥𝑦) → 𝑥 ∈ On))
5248adantrd 485 . . . . . . . . . . . . . . . 16 (𝑆 ⊆ On → ((𝑦𝑆𝑥𝑦) → 𝑦 ∈ On))
53 eloni 5886 . . . . . . . . . . . . . . . . . 18 (𝑦 ∈ On → Ord 𝑦)
5448, 53syl6 35 . . . . . . . . . . . . . . . . 17 (𝑆 ⊆ On → (𝑦𝑆 → Ord 𝑦))
55 ordelss 5892 . . . . . . . . . . . . . . . . . 18 ((Ord 𝑦𝑥𝑦) → 𝑥𝑦)
5655a1i 11 . . . . . . . . . . . . . . . . 17 (𝑆 ⊆ On → ((Ord 𝑦𝑥𝑦) → 𝑥𝑦))
5754, 56syland 499 . . . . . . . . . . . . . . . 16 (𝑆 ⊆ On → ((𝑦𝑆𝑥𝑦) → 𝑥𝑦))
5851, 52, 573jcad 1123 . . . . . . . . . . . . . . 15 (𝑆 ⊆ On → ((𝑦𝑆𝑥𝑦) → (𝑥 ∈ On ∧ 𝑦 ∈ On ∧ 𝑥𝑦)))
59 onfununi.2 . . . . . . . . . . . . . . 15 ((𝑥 ∈ On ∧ 𝑦 ∈ On ∧ 𝑥𝑦) → (𝐹𝑥) ⊆ (𝐹𝑦))
6058, 59syl6 35 . . . . . . . . . . . . . 14 (𝑆 ⊆ On → ((𝑦𝑆𝑥𝑦) → (𝐹𝑥) ⊆ (𝐹𝑦)))
6160expd 451 . . . . . . . . . . . . 13 (𝑆 ⊆ On → (𝑦𝑆 → (𝑥𝑦 → (𝐹𝑥) ⊆ (𝐹𝑦))))
6261reximdvai 3145 . . . . . . . . . . . 12 (𝑆 ⊆ On → (∃𝑦𝑆 𝑥𝑦 → ∃𝑦𝑆 (𝐹𝑥) ⊆ (𝐹𝑦)))
6347, 62syl5bi 232 . . . . . . . . . . 11 (𝑆 ⊆ On → (𝑥 𝑆 → ∃𝑦𝑆 (𝐹𝑥) ⊆ (𝐹𝑦)))
64 ssiun 4706 . . . . . . . . . . 11 (∃𝑦𝑆 (𝐹𝑥) ⊆ (𝐹𝑦) → (𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦))
6563, 64syl6 35 . . . . . . . . . 10 (𝑆 ⊆ On → (𝑥 𝑆 → (𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦)))
6665ralrimiv 3095 . . . . . . . . 9 (𝑆 ⊆ On → ∀𝑥 𝑆(𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦))
67 iunss 4705 . . . . . . . . 9 ( 𝑥 𝑆(𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦) ↔ ∀𝑥 𝑆(𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦))
6866, 67sylibr 224 . . . . . . . 8 (𝑆 ⊆ On → 𝑥 𝑆(𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦))
69 fveq2 6344 . . . . . . . . 9 (𝑦 = 𝑥 → (𝐹𝑦) = (𝐹𝑥))
7069cbviunv 4703 . . . . . . . 8 𝑦𝑆 (𝐹𝑦) = 𝑥𝑆 (𝐹𝑥)
7168, 70syl6sseq 3784 . . . . . . 7 (𝑆 ⊆ On → 𝑥 𝑆(𝐹𝑥) ⊆ 𝑥𝑆 (𝐹𝑥))
72713ad2ant2 1128 . . . . . 6 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → 𝑥 𝑆(𝐹𝑥) ⊆ 𝑥𝑆 (𝐹𝑥))
7372adantr 472 . . . . 5 (((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) ∧ ¬ 𝑆𝑆) → 𝑥 𝑆(𝐹𝑥) ⊆ 𝑥𝑆 (𝐹𝑥))
7446, 73eqsstrd 3772 . . . 4 (((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) ∧ ¬ 𝑆𝑆) → (𝐹 𝑆) ⊆ 𝑥𝑆 (𝐹𝑥))
7574ex 449 . . 3 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (¬ 𝑆𝑆 → (𝐹 𝑆) ⊆ 𝑥𝑆 (𝐹𝑥)))
76 fveq2 6344 . . . 4 (𝑥 = 𝑆 → (𝐹𝑥) = (𝐹 𝑆))
7776ssiun2s 4708 . . 3 ( 𝑆𝑆 → (𝐹 𝑆) ⊆ 𝑥𝑆 (𝐹𝑥))
7875, 77pm2.61d2 172 . 2 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝐹 𝑆) ⊆ 𝑥𝑆 (𝐹𝑥))
7934imp 444 . . . . . 6 ((𝑆𝑇𝑆 ⊆ On) → 𝑆 ∈ On)
80793adant3 1126 . . . . 5 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → 𝑆 ∈ On)
8163ad2ant2 1128 . . . . . 6 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝑥𝑆𝑥 ∈ On))
824a1i 11 . . . . . 6 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝑥𝑆𝑥 𝑆))
8381, 82jcad 556 . . . . 5 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝑥𝑆 → (𝑥 ∈ On ∧ 𝑥 𝑆)))
84 sseq2 3760 . . . . . . . 8 (𝑦 = 𝑆 → (𝑥𝑦𝑥 𝑆))
8584anbi2d 742 . . . . . . 7 (𝑦 = 𝑆 → ((𝑥 ∈ On ∧ 𝑥𝑦) ↔ (𝑥 ∈ On ∧ 𝑥 𝑆)))
8636sseq2d 3766 . . . . . . 7 (𝑦 = 𝑆 → ((𝐹𝑥) ⊆ (𝐹𝑦) ↔ (𝐹𝑥) ⊆ (𝐹 𝑆)))
8785, 86imbi12d 333 . . . . . 6 (𝑦 = 𝑆 → (((𝑥 ∈ On ∧ 𝑥𝑦) → (𝐹𝑥) ⊆ (𝐹𝑦)) ↔ ((𝑥 ∈ On ∧ 𝑥 𝑆) → (𝐹𝑥) ⊆ (𝐹 𝑆))))
88593com12 1117 . . . . . . 7 ((𝑦 ∈ On ∧ 𝑥 ∈ On ∧ 𝑥𝑦) → (𝐹𝑥) ⊆ (𝐹𝑦))
89883expib 1116 . . . . . 6 (𝑦 ∈ On → ((𝑥 ∈ On ∧ 𝑥𝑦) → (𝐹𝑥) ⊆ (𝐹𝑦)))
9087, 89vtoclga 3404 . . . . 5 ( 𝑆 ∈ On → ((𝑥 ∈ On ∧ 𝑥 𝑆) → (𝐹𝑥) ⊆ (𝐹 𝑆)))
9180, 83, 90sylsyld 61 . . . 4 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝑥𝑆 → (𝐹𝑥) ⊆ (𝐹 𝑆)))
9291ralrimiv 3095 . . 3 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → ∀𝑥𝑆 (𝐹𝑥) ⊆ (𝐹 𝑆))
93 iunss 4705 . . 3 ( 𝑥𝑆 (𝐹𝑥) ⊆ (𝐹 𝑆) ↔ ∀𝑥𝑆 (𝐹𝑥) ⊆ (𝐹 𝑆))
9492, 93sylibr 224 . 2 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → 𝑥𝑆 (𝐹𝑥) ⊆ (𝐹 𝑆))
9578, 94eqssd 3753 1 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝐹 𝑆) = 𝑥𝑆 (𝐹𝑥))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wo 382  wa 383  w3a 1072   = wceq 1624  wcel 2131  wne 2924  wral 3042  wrex 3043  wss 3707  c0 4050   cuni 4580   ciun 4664  Ord word 5875  Oncon0 5876  Lim wlim 5877  cfv 6041
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1863  ax-4 1878  ax-5 1980  ax-6 2046  ax-7 2082  ax-8 2133  ax-9 2140  ax-10 2160  ax-11 2175  ax-12 2188  ax-13 2383  ax-ext 2732  ax-sep 4925  ax-nul 4933  ax-pr 5047  ax-un 7106
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1073  df-3an 1074  df-tru 1627  df-ex 1846  df-nf 1851  df-sb 2039  df-eu 2603  df-mo 2604  df-clab 2739  df-cleq 2745  df-clel 2748  df-nfc 2883  df-ne 2925  df-ral 3047  df-rex 3048  df-rab 3051  df-v 3334  df-sbc 3569  df-dif 3710  df-un 3712  df-in 3714  df-ss 3721  df-pss 3723  df-nul 4051  df-if 4223  df-sn 4314  df-pr 4316  df-tp 4318  df-op 4320  df-uni 4581  df-iun 4666  df-br 4797  df-opab 4857  df-tr 4897  df-eprel 5171  df-po 5179  df-so 5180  df-fr 5217  df-we 5219  df-ord 5879  df-on 5880  df-lim 5881  df-iota 6004  df-fv 6049
This theorem is referenced by:  onovuni  7600
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