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Theorem onfununi 8380
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 7798 . . . . . . . . . 10 (𝑆 ⊆ On → Ord 𝑆)
21ad2antrr 726 . . . . . . . . 9 (((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) ∧ 𝑆 ≠ ∅) → Ord 𝑆)
3 nelneq 2863 . . . . . . . . . . . . . . . 16 ((𝑥𝑆 ∧ ¬ 𝑆𝑆) → ¬ 𝑥 = 𝑆)
4 elssuni 4942 . . . . . . . . . . . . . . . . . . . 20 (𝑥𝑆𝑥 𝑆)
54adantl 481 . . . . . . . . . . . . . . . . . . 19 ((𝑆 ⊆ On ∧ 𝑥𝑆) → 𝑥 𝑆)
6 ssel 3989 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑆 ⊆ On → (𝑥𝑆𝑥 ∈ On))
7 eloni 6396 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑥 ∈ On → Ord 𝑥)
86, 7syl6 35 . . . . . . . . . . . . . . . . . . . . . 22 (𝑆 ⊆ On → (𝑥𝑆 → Ord 𝑥))
98imp 406 . . . . . . . . . . . . . . . . . . . . 21 ((𝑆 ⊆ On ∧ 𝑥𝑆) → Ord 𝑥)
10 ordsseleq 6415 . . . . . . . . . . . . . . . . . . . . 21 ((Ord 𝑥 ∧ Ord 𝑆) → (𝑥 𝑆 ↔ (𝑥 𝑆𝑥 = 𝑆)))
119, 1, 10syl2an 596 . . . . . . . . . . . . . . . . . . . 20 (((𝑆 ⊆ On ∧ 𝑥𝑆) ∧ 𝑆 ⊆ On) → (𝑥 𝑆 ↔ (𝑥 𝑆𝑥 = 𝑆)))
1211anabss1 666 . . . . . . . . . . . . . . . . . . 19 ((𝑆 ⊆ On ∧ 𝑥𝑆) → (𝑥 𝑆 ↔ (𝑥 𝑆𝑥 = 𝑆)))
135, 12mpbid 232 . . . . . . . . . . . . . . . . . 18 ((𝑆 ⊆ On ∧ 𝑥𝑆) → (𝑥 𝑆𝑥 = 𝑆))
1413ord 864 . . . . . . . . . . . . . . . . 17 ((𝑆 ⊆ On ∧ 𝑥𝑆) → (¬ 𝑥 𝑆𝑥 = 𝑆))
1514con1d 145 . . . . . . . . . . . . . . . 16 ((𝑆 ⊆ On ∧ 𝑥𝑆) → (¬ 𝑥 = 𝑆𝑥 𝑆))
163, 15syl5 34 . . . . . . . . . . . . . . 15 ((𝑆 ⊆ On ∧ 𝑥𝑆) → ((𝑥𝑆 ∧ ¬ 𝑆𝑆) → 𝑥 𝑆))
1716exp4b 430 . . . . . . . . . . . . . 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 406 . . . . . . . . . . 11 ((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) → (𝑥𝑆𝑥 𝑆))
2120ssrdv 4001 . . . . . . . . . 10 ((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) → 𝑆 𝑆)
22 ssn0 4410 . . . . . . . . . 10 ((𝑆 𝑆𝑆 ≠ ∅) → 𝑆 ≠ ∅)
2321, 22sylan 580 . . . . . . . . 9 (((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) ∧ 𝑆 ≠ ∅) → 𝑆 ≠ ∅)
2421unissd 4922 . . . . . . . . . . 11 ((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) → 𝑆 𝑆)
25 orduniss 6483 . . . . . . . . . . . . 13 (Ord 𝑆 𝑆 𝑆)
261, 25syl 17 . . . . . . . . . . . 12 (𝑆 ⊆ On → 𝑆 𝑆)
2726adantr 480 . . . . . . . . . . 11 ((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) → 𝑆 𝑆)
2824, 27eqssd 4013 . . . . . . . . . 10 ((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) → 𝑆 = 𝑆)
2928adantr 480 . . . . . . . . 9 (((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) ∧ 𝑆 ≠ ∅) → 𝑆 = 𝑆)
30 df-lim 6391 . . . . . . . . 9 (Lim 𝑆 ↔ (Ord 𝑆 𝑆 ≠ ∅ ∧ 𝑆 = 𝑆))
312, 23, 29, 30syl3anbrc 1342 . . . . . . . 8 (((𝑆 ⊆ On ∧ ¬ 𝑆𝑆) ∧ 𝑆 ≠ ∅) → Lim 𝑆)
3231an32s 652 . . . . . . 7 (((𝑆 ⊆ On ∧ 𝑆 ≠ ∅) ∧ ¬ 𝑆𝑆) → Lim 𝑆)
33323adantl1 1165 . . . . . 6 (((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) ∧ ¬ 𝑆𝑆) → Lim 𝑆)
34 ssonuni 7799 . . . . . . . . . 10 (𝑆𝑇 → (𝑆 ⊆ On → 𝑆 ∈ On))
35 limeq 6398 . . . . . . . . . . . 12 (𝑦 = 𝑆 → (Lim 𝑦 ↔ Lim 𝑆))
36 fveq2 6907 . . . . . . . . . . . . 13 (𝑦 = 𝑆 → (𝐹𝑦) = (𝐹 𝑆))
37 iuneq1 5013 . . . . . . . . . . . . 13 (𝑦 = 𝑆 𝑥𝑦 (𝐹𝑥) = 𝑥 𝑆(𝐹𝑥))
3836, 37eqeq12d 2751 . . . . . . . . . . . 12 (𝑦 = 𝑆 → ((𝐹𝑦) = 𝑥𝑦 (𝐹𝑥) ↔ (𝐹 𝑆) = 𝑥 𝑆(𝐹𝑥)))
3935, 38imbi12d 344 . . . . . . . . . . 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 3554 . . . . . . . . . 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 406 . . . . . . . 8 ((𝑆𝑇𝑆 ⊆ On) → (Lim 𝑆 → (𝐹 𝑆) = 𝑥 𝑆(𝐹𝑥)))
44433adant3 1131 . . . . . . 7 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (Lim 𝑆 → (𝐹 𝑆) = 𝑥 𝑆(𝐹𝑥)))
4544adantr 480 . . . . . 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 4916 . . . . . . . . . . . 12 (𝑥 𝑆 ↔ ∃𝑦𝑆 𝑥𝑦)
48 ssel 3989 . . . . . . . . . . . . . . . . . 18 (𝑆 ⊆ On → (𝑦𝑆𝑦 ∈ On))
4948anim1d 611 . . . . . . . . . . . . . . . . 17 (𝑆 ⊆ On → ((𝑦𝑆𝑥𝑦) → (𝑦 ∈ On ∧ 𝑥𝑦)))
50 onelon 6411 . . . . . . . . . . . . . . . . 17 ((𝑦 ∈ On ∧ 𝑥𝑦) → 𝑥 ∈ On)
5149, 50syl6 35 . . . . . . . . . . . . . . . 16 (𝑆 ⊆ On → ((𝑦𝑆𝑥𝑦) → 𝑥 ∈ On))
5248adantrd 491 . . . . . . . . . . . . . . . 16 (𝑆 ⊆ On → ((𝑦𝑆𝑥𝑦) → 𝑦 ∈ On))
53 eloni 6396 . . . . . . . . . . . . . . . . . 18 (𝑦 ∈ On → Ord 𝑦)
5448, 53syl6 35 . . . . . . . . . . . . . . . . 17 (𝑆 ⊆ On → (𝑦𝑆 → Ord 𝑦))
55 ordelss 6402 . . . . . . . . . . . . . . . . . 18 ((Ord 𝑦𝑥𝑦) → 𝑥𝑦)
5655a1i 11 . . . . . . . . . . . . . . . . 17 (𝑆 ⊆ On → ((Ord 𝑦𝑥𝑦) → 𝑥𝑦))
5754, 56syland 603 . . . . . . . . . . . . . . . 16 (𝑆 ⊆ On → ((𝑦𝑆𝑥𝑦) → 𝑥𝑦))
5851, 52, 573jcad 1128 . . . . . . . . . . . . . . 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 415 . . . . . . . . . . . . 13 (𝑆 ⊆ On → (𝑦𝑆 → (𝑥𝑦 → (𝐹𝑥) ⊆ (𝐹𝑦))))
6261reximdvai 3163 . . . . . . . . . . . 12 (𝑆 ⊆ On → (∃𝑦𝑆 𝑥𝑦 → ∃𝑦𝑆 (𝐹𝑥) ⊆ (𝐹𝑦)))
6347, 62biimtrid 242 . . . . . . . . . . 11 (𝑆 ⊆ On → (𝑥 𝑆 → ∃𝑦𝑆 (𝐹𝑥) ⊆ (𝐹𝑦)))
64 ssiun 5051 . . . . . . . . . . 11 (∃𝑦𝑆 (𝐹𝑥) ⊆ (𝐹𝑦) → (𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦))
6563, 64syl6 35 . . . . . . . . . 10 (𝑆 ⊆ On → (𝑥 𝑆 → (𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦)))
6665ralrimiv 3143 . . . . . . . . 9 (𝑆 ⊆ On → ∀𝑥 𝑆(𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦))
67 iunss 5050 . . . . . . . . 9 ( 𝑥 𝑆(𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦) ↔ ∀𝑥 𝑆(𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦))
6866, 67sylibr 234 . . . . . . . 8 (𝑆 ⊆ On → 𝑥 𝑆(𝐹𝑥) ⊆ 𝑦𝑆 (𝐹𝑦))
69 fveq2 6907 . . . . . . . . 9 (𝑦 = 𝑥 → (𝐹𝑦) = (𝐹𝑥))
7069cbviunv 5045 . . . . . . . 8 𝑦𝑆 (𝐹𝑦) = 𝑥𝑆 (𝐹𝑥)
7168, 70sseqtrdi 4046 . . . . . . 7 (𝑆 ⊆ On → 𝑥 𝑆(𝐹𝑥) ⊆ 𝑥𝑆 (𝐹𝑥))
72713ad2ant2 1133 . . . . . 6 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → 𝑥 𝑆(𝐹𝑥) ⊆ 𝑥𝑆 (𝐹𝑥))
7372adantr 480 . . . . 5 (((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) ∧ ¬ 𝑆𝑆) → 𝑥 𝑆(𝐹𝑥) ⊆ 𝑥𝑆 (𝐹𝑥))
7446, 73eqsstrd 4034 . . . 4 (((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) ∧ ¬ 𝑆𝑆) → (𝐹 𝑆) ⊆ 𝑥𝑆 (𝐹𝑥))
7574ex 412 . . 3 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (¬ 𝑆𝑆 → (𝐹 𝑆) ⊆ 𝑥𝑆 (𝐹𝑥)))
76 fveq2 6907 . . . 4 (𝑥 = 𝑆 → (𝐹𝑥) = (𝐹 𝑆))
7776ssiun2s 5053 . . 3 ( 𝑆𝑆 → (𝐹 𝑆) ⊆ 𝑥𝑆 (𝐹𝑥))
7875, 77pm2.61d2 181 . 2 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝐹 𝑆) ⊆ 𝑥𝑆 (𝐹𝑥))
7934imp 406 . . . . . 6 ((𝑆𝑇𝑆 ⊆ On) → 𝑆 ∈ On)
80793adant3 1131 . . . . 5 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → 𝑆 ∈ On)
8163ad2ant2 1133 . . . . . 6 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝑥𝑆𝑥 ∈ On))
8281, 4jca2 513 . . . . 5 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝑥𝑆 → (𝑥 ∈ On ∧ 𝑥 𝑆)))
83 sseq2 4022 . . . . . . . 8 (𝑦 = 𝑆 → (𝑥𝑦𝑥 𝑆))
8483anbi2d 630 . . . . . . 7 (𝑦 = 𝑆 → ((𝑥 ∈ On ∧ 𝑥𝑦) ↔ (𝑥 ∈ On ∧ 𝑥 𝑆)))
8536sseq2d 4028 . . . . . . 7 (𝑦 = 𝑆 → ((𝐹𝑥) ⊆ (𝐹𝑦) ↔ (𝐹𝑥) ⊆ (𝐹 𝑆)))
8684, 85imbi12d 344 . . . . . 6 (𝑦 = 𝑆 → (((𝑥 ∈ On ∧ 𝑥𝑦) → (𝐹𝑥) ⊆ (𝐹𝑦)) ↔ ((𝑥 ∈ On ∧ 𝑥 𝑆) → (𝐹𝑥) ⊆ (𝐹 𝑆))))
87593com12 1122 . . . . . . 7 ((𝑦 ∈ On ∧ 𝑥 ∈ On ∧ 𝑥𝑦) → (𝐹𝑥) ⊆ (𝐹𝑦))
88873expib 1121 . . . . . 6 (𝑦 ∈ On → ((𝑥 ∈ On ∧ 𝑥𝑦) → (𝐹𝑥) ⊆ (𝐹𝑦)))
8986, 88vtoclga 3577 . . . . 5 ( 𝑆 ∈ On → ((𝑥 ∈ On ∧ 𝑥 𝑆) → (𝐹𝑥) ⊆ (𝐹 𝑆)))
9080, 82, 89sylsyld 61 . . . 4 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝑥𝑆 → (𝐹𝑥) ⊆ (𝐹 𝑆)))
9190ralrimiv 3143 . . 3 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → ∀𝑥𝑆 (𝐹𝑥) ⊆ (𝐹 𝑆))
92 iunss 5050 . . 3 ( 𝑥𝑆 (𝐹𝑥) ⊆ (𝐹 𝑆) ↔ ∀𝑥𝑆 (𝐹𝑥) ⊆ (𝐹 𝑆))
9391, 92sylibr 234 . 2 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → 𝑥𝑆 (𝐹𝑥) ⊆ (𝐹 𝑆))
9478, 93eqssd 4013 1 ((𝑆𝑇𝑆 ⊆ On ∧ 𝑆 ≠ ∅) → (𝐹 𝑆) = 𝑥𝑆 (𝐹𝑥))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 206  wa 395  wo 847  w3a 1086   = wceq 1537  wcel 2106  wne 2938  wral 3059  wrex 3068  wss 3963  c0 4339   cuni 4912   ciun 4996  Ord word 6385  Oncon0 6386  Lim wlim 6387  cfv 6563
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-10 2139  ax-11 2155  ax-12 2175  ax-ext 2706  ax-sep 5302  ax-nul 5312  ax-pr 5438  ax-un 7754
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-nf 1781  df-sb 2063  df-clab 2713  df-cleq 2727  df-clel 2814  df-nfc 2890  df-ne 2939  df-ral 3060  df-rex 3069  df-rab 3434  df-v 3480  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-pss 3983  df-nul 4340  df-if 4532  df-pw 4607  df-sn 4632  df-pr 4634  df-op 4638  df-uni 4913  df-iun 4998  df-br 5149  df-opab 5211  df-tr 5266  df-eprel 5589  df-po 5597  df-so 5598  df-fr 5641  df-we 5643  df-ord 6389  df-on 6390  df-lim 6391  df-iota 6516  df-fv 6571
This theorem is referenced by:  onovuni  8381
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