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Theorem oelim2 8231
 Description: Ordinal exponentiation with a limit exponent. Part of Exercise 4.36 of [Mendelson] p. 250. (Contributed by NM, 6-Jan-2005.)
Assertion
Ref Expression
oelim2 ((𝐴 ∈ On ∧ (𝐵𝐶 ∧ Lim 𝐵)) → (𝐴o 𝐵) = 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵
Allowed substitution hint:   𝐶(𝑥)

Proof of Theorem oelim2
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 limelon 6232 . . . . . 6 ((𝐵𝐶 ∧ Lim 𝐵) → 𝐵 ∈ On)
2 0ellim 6231 . . . . . . 7 (Lim 𝐵 → ∅ ∈ 𝐵)
32adantl 485 . . . . . 6 ((𝐵𝐶 ∧ Lim 𝐵) → ∅ ∈ 𝐵)
4 oe0m1 8156 . . . . . . 7 (𝐵 ∈ On → (∅ ∈ 𝐵 ↔ (∅ ↑o 𝐵) = ∅))
54biimpa 480 . . . . . 6 ((𝐵 ∈ On ∧ ∅ ∈ 𝐵) → (∅ ↑o 𝐵) = ∅)
61, 3, 5syl2anc 587 . . . . 5 ((𝐵𝐶 ∧ Lim 𝐵) → (∅ ↑o 𝐵) = ∅)
7 eldif 3868 . . . . . . . . 9 (𝑥 ∈ (𝐵 ∖ 1o) ↔ (𝑥𝐵 ∧ ¬ 𝑥 ∈ 1o))
8 limord 6228 . . . . . . . . . . . 12 (Lim 𝐵 → Ord 𝐵)
9 ordelon 6193 . . . . . . . . . . . 12 ((Ord 𝐵𝑥𝐵) → 𝑥 ∈ On)
108, 9sylan 583 . . . . . . . . . . 11 ((Lim 𝐵𝑥𝐵) → 𝑥 ∈ On)
11 on0eln0 6224 . . . . . . . . . . . . 13 (𝑥 ∈ On → (∅ ∈ 𝑥𝑥 ≠ ∅))
12 el1o 8134 . . . . . . . . . . . . . 14 (𝑥 ∈ 1o𝑥 = ∅)
1312necon3bbii 2998 . . . . . . . . . . . . 13 𝑥 ∈ 1o𝑥 ≠ ∅)
1411, 13bitr4di 292 . . . . . . . . . . . 12 (𝑥 ∈ On → (∅ ∈ 𝑥 ↔ ¬ 𝑥 ∈ 1o))
15 oe0m1 8156 . . . . . . . . . . . . 13 (𝑥 ∈ On → (∅ ∈ 𝑥 ↔ (∅ ↑o 𝑥) = ∅))
1615biimpd 232 . . . . . . . . . . . 12 (𝑥 ∈ On → (∅ ∈ 𝑥 → (∅ ↑o 𝑥) = ∅))
1714, 16sylbird 263 . . . . . . . . . . 11 (𝑥 ∈ On → (¬ 𝑥 ∈ 1o → (∅ ↑o 𝑥) = ∅))
1810, 17syl 17 . . . . . . . . . 10 ((Lim 𝐵𝑥𝐵) → (¬ 𝑥 ∈ 1o → (∅ ↑o 𝑥) = ∅))
1918impr 458 . . . . . . . . 9 ((Lim 𝐵 ∧ (𝑥𝐵 ∧ ¬ 𝑥 ∈ 1o)) → (∅ ↑o 𝑥) = ∅)
207, 19sylan2b 596 . . . . . . . 8 ((Lim 𝐵𝑥 ∈ (𝐵 ∖ 1o)) → (∅ ↑o 𝑥) = ∅)
2120iuneq2dv 4907 . . . . . . 7 (Lim 𝐵 𝑥 ∈ (𝐵 ∖ 1o)(∅ ↑o 𝑥) = 𝑥 ∈ (𝐵 ∖ 1o)∅)
22 df-1o 8112 . . . . . . . . . 10 1o = suc ∅
23 limsuc 7563 . . . . . . . . . . 11 (Lim 𝐵 → (∅ ∈ 𝐵 ↔ suc ∅ ∈ 𝐵))
242, 23mpbid 235 . . . . . . . . . 10 (Lim 𝐵 → suc ∅ ∈ 𝐵)
2522, 24eqeltrid 2856 . . . . . . . . 9 (Lim 𝐵 → 1o𝐵)
26 1on 8119 . . . . . . . . . 10 1o ∈ On
2726onirri 6276 . . . . . . . . 9 ¬ 1o ∈ 1o
28 eldif 3868 . . . . . . . . 9 (1o ∈ (𝐵 ∖ 1o) ↔ (1o𝐵 ∧ ¬ 1o ∈ 1o))
2925, 27, 28sylanblrc 593 . . . . . . . 8 (Lim 𝐵 → 1o ∈ (𝐵 ∖ 1o))
30 ne0i 4233 . . . . . . . 8 (1o ∈ (𝐵 ∖ 1o) → (𝐵 ∖ 1o) ≠ ∅)
31 iunconst 4892 . . . . . . . 8 ((𝐵 ∖ 1o) ≠ ∅ → 𝑥 ∈ (𝐵 ∖ 1o)∅ = ∅)
3229, 30, 313syl 18 . . . . . . 7 (Lim 𝐵 𝑥 ∈ (𝐵 ∖ 1o)∅ = ∅)
3321, 32eqtrd 2793 . . . . . 6 (Lim 𝐵 𝑥 ∈ (𝐵 ∖ 1o)(∅ ↑o 𝑥) = ∅)
3433adantl 485 . . . . 5 ((𝐵𝐶 ∧ Lim 𝐵) → 𝑥 ∈ (𝐵 ∖ 1o)(∅ ↑o 𝑥) = ∅)
356, 34eqtr4d 2796 . . . 4 ((𝐵𝐶 ∧ Lim 𝐵) → (∅ ↑o 𝐵) = 𝑥 ∈ (𝐵 ∖ 1o)(∅ ↑o 𝑥))
36 oveq1 7157 . . . . 5 (𝐴 = ∅ → (𝐴o 𝐵) = (∅ ↑o 𝐵))
37 oveq1 7157 . . . . . 6 (𝐴 = ∅ → (𝐴o 𝑥) = (∅ ↑o 𝑥))
3837iuneq2d 4912 . . . . 5 (𝐴 = ∅ → 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥) = 𝑥 ∈ (𝐵 ∖ 1o)(∅ ↑o 𝑥))
3936, 38eqeq12d 2774 . . . 4 (𝐴 = ∅ → ((𝐴o 𝐵) = 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥) ↔ (∅ ↑o 𝐵) = 𝑥 ∈ (𝐵 ∖ 1o)(∅ ↑o 𝑥)))
4035, 39syl5ibr 249 . . 3 (𝐴 = ∅ → ((𝐵𝐶 ∧ Lim 𝐵) → (𝐴o 𝐵) = 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥)))
4140impcom 411 . 2 (((𝐵𝐶 ∧ Lim 𝐵) ∧ 𝐴 = ∅) → (𝐴o 𝐵) = 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥))
42 oelim 8169 . . 3 (((𝐴 ∈ On ∧ (𝐵𝐶 ∧ Lim 𝐵)) ∧ ∅ ∈ 𝐴) → (𝐴o 𝐵) = 𝑦𝐵 (𝐴o 𝑦))
43 limsuc 7563 . . . . . . . . . . . . 13 (Lim 𝐵 → (𝑦𝐵 ↔ suc 𝑦𝐵))
4443biimpa 480 . . . . . . . . . . . 12 ((Lim 𝐵𝑦𝐵) → suc 𝑦𝐵)
45 nsuceq0 6249 . . . . . . . . . . . 12 suc 𝑦 ≠ ∅
46 dif1o 8135 . . . . . . . . . . . 12 (suc 𝑦 ∈ (𝐵 ∖ 1o) ↔ (suc 𝑦𝐵 ∧ suc 𝑦 ≠ ∅))
4744, 45, 46sylanblrc 593 . . . . . . . . . . 11 ((Lim 𝐵𝑦𝐵) → suc 𝑦 ∈ (𝐵 ∖ 1o))
4847ex 416 . . . . . . . . . 10 (Lim 𝐵 → (𝑦𝐵 → suc 𝑦 ∈ (𝐵 ∖ 1o)))
4948ad2antlr 726 . . . . . . . . 9 (((𝐴 ∈ On ∧ Lim 𝐵) ∧ ∅ ∈ 𝐴) → (𝑦𝐵 → suc 𝑦 ∈ (𝐵 ∖ 1o)))
50 sssucid 6246 . . . . . . . . . . 11 𝑦 ⊆ suc 𝑦
51 ordelon 6193 . . . . . . . . . . . . . . . . 17 ((Ord 𝐵𝑦𝐵) → 𝑦 ∈ On)
528, 51sylan 583 . . . . . . . . . . . . . . . 16 ((Lim 𝐵𝑦𝐵) → 𝑦 ∈ On)
53 suceloni 7527 . . . . . . . . . . . . . . . 16 (𝑦 ∈ On → suc 𝑦 ∈ On)
5452, 53jccir 525 . . . . . . . . . . . . . . 15 ((Lim 𝐵𝑦𝐵) → (𝑦 ∈ On ∧ suc 𝑦 ∈ On))
55 id 22 . . . . . . . . . . . . . . . . 17 ((𝑦 ∈ On ∧ suc 𝑦 ∈ On ∧ 𝐴 ∈ On) → (𝑦 ∈ On ∧ suc 𝑦 ∈ On ∧ 𝐴 ∈ On))
56553expa 1115 . . . . . . . . . . . . . . . 16 (((𝑦 ∈ On ∧ suc 𝑦 ∈ On) ∧ 𝐴 ∈ On) → (𝑦 ∈ On ∧ suc 𝑦 ∈ On ∧ 𝐴 ∈ On))
5756ancoms 462 . . . . . . . . . . . . . . 15 ((𝐴 ∈ On ∧ (𝑦 ∈ On ∧ suc 𝑦 ∈ On)) → (𝑦 ∈ On ∧ suc 𝑦 ∈ On ∧ 𝐴 ∈ On))
5854, 57sylan2 595 . . . . . . . . . . . . . 14 ((𝐴 ∈ On ∧ (Lim 𝐵𝑦𝐵)) → (𝑦 ∈ On ∧ suc 𝑦 ∈ On ∧ 𝐴 ∈ On))
5958anassrs 471 . . . . . . . . . . . . 13 (((𝐴 ∈ On ∧ Lim 𝐵) ∧ 𝑦𝐵) → (𝑦 ∈ On ∧ suc 𝑦 ∈ On ∧ 𝐴 ∈ On))
60 oewordi 8227 . . . . . . . . . . . . 13 (((𝑦 ∈ On ∧ suc 𝑦 ∈ On ∧ 𝐴 ∈ On) ∧ ∅ ∈ 𝐴) → (𝑦 ⊆ suc 𝑦 → (𝐴o 𝑦) ⊆ (𝐴o suc 𝑦)))
6159, 60sylan 583 . . . . . . . . . . . 12 ((((𝐴 ∈ On ∧ Lim 𝐵) ∧ 𝑦𝐵) ∧ ∅ ∈ 𝐴) → (𝑦 ⊆ suc 𝑦 → (𝐴o 𝑦) ⊆ (𝐴o suc 𝑦)))
6261an32s 651 . . . . . . . . . . 11 ((((𝐴 ∈ On ∧ Lim 𝐵) ∧ ∅ ∈ 𝐴) ∧ 𝑦𝐵) → (𝑦 ⊆ suc 𝑦 → (𝐴o 𝑦) ⊆ (𝐴o suc 𝑦)))
6350, 62mpi 20 . . . . . . . . . 10 ((((𝐴 ∈ On ∧ Lim 𝐵) ∧ ∅ ∈ 𝐴) ∧ 𝑦𝐵) → (𝐴o 𝑦) ⊆ (𝐴o suc 𝑦))
6463ex 416 . . . . . . . . 9 (((𝐴 ∈ On ∧ Lim 𝐵) ∧ ∅ ∈ 𝐴) → (𝑦𝐵 → (𝐴o 𝑦) ⊆ (𝐴o suc 𝑦)))
6549, 64jcad 516 . . . . . . . 8 (((𝐴 ∈ On ∧ Lim 𝐵) ∧ ∅ ∈ 𝐴) → (𝑦𝐵 → (suc 𝑦 ∈ (𝐵 ∖ 1o) ∧ (𝐴o 𝑦) ⊆ (𝐴o suc 𝑦))))
66 oveq2 7158 . . . . . . . . . 10 (𝑥 = suc 𝑦 → (𝐴o 𝑥) = (𝐴o suc 𝑦))
6766sseq2d 3924 . . . . . . . . 9 (𝑥 = suc 𝑦 → ((𝐴o 𝑦) ⊆ (𝐴o 𝑥) ↔ (𝐴o 𝑦) ⊆ (𝐴o suc 𝑦)))
6867rspcev 3541 . . . . . . . 8 ((suc 𝑦 ∈ (𝐵 ∖ 1o) ∧ (𝐴o 𝑦) ⊆ (𝐴o suc 𝑦)) → ∃𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑦) ⊆ (𝐴o 𝑥))
6965, 68syl6 35 . . . . . . 7 (((𝐴 ∈ On ∧ Lim 𝐵) ∧ ∅ ∈ 𝐴) → (𝑦𝐵 → ∃𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑦) ⊆ (𝐴o 𝑥)))
7069ralrimiv 3112 . . . . . 6 (((𝐴 ∈ On ∧ Lim 𝐵) ∧ ∅ ∈ 𝐴) → ∀𝑦𝐵𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑦) ⊆ (𝐴o 𝑥))
71 iunss2 4938 . . . . . 6 (∀𝑦𝐵𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑦) ⊆ (𝐴o 𝑥) → 𝑦𝐵 (𝐴o 𝑦) ⊆ 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥))
7270, 71syl 17 . . . . 5 (((𝐴 ∈ On ∧ Lim 𝐵) ∧ ∅ ∈ 𝐴) → 𝑦𝐵 (𝐴o 𝑦) ⊆ 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥))
73 difss 4037 . . . . . . . 8 (𝐵 ∖ 1o) ⊆ 𝐵
74 iunss1 4897 . . . . . . . 8 ((𝐵 ∖ 1o) ⊆ 𝐵 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥) ⊆ 𝑥𝐵 (𝐴o 𝑥))
7573, 74ax-mp 5 . . . . . . 7 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥) ⊆ 𝑥𝐵 (𝐴o 𝑥)
76 oveq2 7158 . . . . . . . 8 (𝑥 = 𝑦 → (𝐴o 𝑥) = (𝐴o 𝑦))
7776cbviunv 4929 . . . . . . 7 𝑥𝐵 (𝐴o 𝑥) = 𝑦𝐵 (𝐴o 𝑦)
7875, 77sseqtri 3928 . . . . . 6 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥) ⊆ 𝑦𝐵 (𝐴o 𝑦)
7978a1i 11 . . . . 5 (((𝐴 ∈ On ∧ Lim 𝐵) ∧ ∅ ∈ 𝐴) → 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥) ⊆ 𝑦𝐵 (𝐴o 𝑦))
8072, 79eqssd 3909 . . . 4 (((𝐴 ∈ On ∧ Lim 𝐵) ∧ ∅ ∈ 𝐴) → 𝑦𝐵 (𝐴o 𝑦) = 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥))
8180adantlrl 719 . . 3 (((𝐴 ∈ On ∧ (𝐵𝐶 ∧ Lim 𝐵)) ∧ ∅ ∈ 𝐴) → 𝑦𝐵 (𝐴o 𝑦) = 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥))
8242, 81eqtrd 2793 . 2 (((𝐴 ∈ On ∧ (𝐵𝐶 ∧ Lim 𝐵)) ∧ ∅ ∈ 𝐴) → (𝐴o 𝐵) = 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥))
8341, 82oe0lem 8148 1 ((𝐴 ∈ On ∧ (𝐵𝐶 ∧ Lim 𝐵)) → (𝐴o 𝐵) = 𝑥 ∈ (𝐵 ∖ 1o)(𝐴o 𝑥))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 399   ∧ w3a 1084   = wceq 1538   ∈ wcel 2111   ≠ wne 2951  ∀wral 3070  ∃wrex 3071   ∖ cdif 3855   ⊆ wss 3858  ∅c0 4225  ∪ ciun 4883  Ord word 6168  Oncon0 6169  Lim wlim 6170  suc csuc 6171  (class class class)co 7150  1oc1o 8105   ↑o coe 8111 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 2729  ax-rep 5156  ax-sep 5169  ax-nul 5176  ax-pr 5298  ax-un 7459 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ne 2952  df-ral 3075  df-rex 3076  df-reu 3077  df-rab 3079  df-v 3411  df-sbc 3697  df-csb 3806  df-dif 3861  df-un 3863  df-in 3865  df-ss 3875  df-pss 3877  df-nul 4226  df-if 4421  df-pw 4496  df-sn 4523  df-pr 4525  df-tp 4527  df-op 4529  df-uni 4799  df-iun 4885  df-br 5033  df-opab 5095  df-mpt 5113  df-tr 5139  df-id 5430  df-eprel 5435  df-po 5443  df-so 5444  df-fr 5483  df-we 5485  df-xp 5530  df-rel 5531  df-cnv 5532  df-co 5533  df-dm 5534  df-rn 5535  df-res 5536  df-ima 5537  df-pred 6126  df-ord 6172  df-on 6173  df-lim 6174  df-suc 6175  df-iota 6294  df-fun 6337  df-fn 6338  df-f 6339  df-f1 6340  df-fo 6341  df-f1o 6342  df-fv 6343  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7580  df-wrecs 7957  df-recs 8018  df-rdg 8056  df-1o 8112  df-2o 8113  df-oadd 8116  df-omul 8117  df-oexp 8118 This theorem is referenced by:  oelimcl  8236  oaabs2  8282  omabs  8284
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