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Theorem oen0 8190
Description: Ordinal exponentiation with a nonzero mantissa is nonzero. Proposition 8.32 of [TakeutiZaring] p. 67. (Contributed by NM, 4-Jan-2005.)
Assertion
Ref Expression
oen0 (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ ∅ ∈ 𝐴) → ∅ ∈ (𝐴o 𝐵))

Proof of Theorem oen0
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 oveq2 7141 . . . . . 6 (𝑥 = ∅ → (𝐴o 𝑥) = (𝐴o ∅))
21eleq2d 2896 . . . . 5 (𝑥 = ∅ → (∅ ∈ (𝐴o 𝑥) ↔ ∅ ∈ (𝐴o ∅)))
3 oveq2 7141 . . . . . 6 (𝑥 = 𝑦 → (𝐴o 𝑥) = (𝐴o 𝑦))
43eleq2d 2896 . . . . 5 (𝑥 = 𝑦 → (∅ ∈ (𝐴o 𝑥) ↔ ∅ ∈ (𝐴o 𝑦)))
5 oveq2 7141 . . . . . 6 (𝑥 = suc 𝑦 → (𝐴o 𝑥) = (𝐴o suc 𝑦))
65eleq2d 2896 . . . . 5 (𝑥 = suc 𝑦 → (∅ ∈ (𝐴o 𝑥) ↔ ∅ ∈ (𝐴o suc 𝑦)))
7 oveq2 7141 . . . . . 6 (𝑥 = 𝐵 → (𝐴o 𝑥) = (𝐴o 𝐵))
87eleq2d 2896 . . . . 5 (𝑥 = 𝐵 → (∅ ∈ (𝐴o 𝑥) ↔ ∅ ∈ (𝐴o 𝐵)))
9 0lt1o 8107 . . . . . . 7 ∅ ∈ 1o
10 oe0 8125 . . . . . . 7 (𝐴 ∈ On → (𝐴o ∅) = 1o)
119, 10eleqtrrid 2918 . . . . . 6 (𝐴 ∈ On → ∅ ∈ (𝐴o ∅))
1211adantr 483 . . . . 5 ((𝐴 ∈ On ∧ ∅ ∈ 𝐴) → ∅ ∈ (𝐴o ∅))
13 oecl 8140 . . . . . . . . . . 11 ((𝐴 ∈ On ∧ 𝑦 ∈ On) → (𝐴o 𝑦) ∈ On)
14 omordi 8170 . . . . . . . . . . . 12 (((𝐴 ∈ On ∧ (𝐴o 𝑦) ∈ On) ∧ ∅ ∈ (𝐴o 𝑦)) → (∅ ∈ 𝐴 → ((𝐴o 𝑦) ·o ∅) ∈ ((𝐴o 𝑦) ·o 𝐴)))
15 om0 8120 . . . . . . . . . . . . . 14 ((𝐴o 𝑦) ∈ On → ((𝐴o 𝑦) ·o ∅) = ∅)
1615eleq1d 2895 . . . . . . . . . . . . 13 ((𝐴o 𝑦) ∈ On → (((𝐴o 𝑦) ·o ∅) ∈ ((𝐴o 𝑦) ·o 𝐴) ↔ ∅ ∈ ((𝐴o 𝑦) ·o 𝐴)))
1716ad2antlr 725 . . . . . . . . . . . 12 (((𝐴 ∈ On ∧ (𝐴o 𝑦) ∈ On) ∧ ∅ ∈ (𝐴o 𝑦)) → (((𝐴o 𝑦) ·o ∅) ∈ ((𝐴o 𝑦) ·o 𝐴) ↔ ∅ ∈ ((𝐴o 𝑦) ·o 𝐴)))
1814, 17sylibd 241 . . . . . . . . . . 11 (((𝐴 ∈ On ∧ (𝐴o 𝑦) ∈ On) ∧ ∅ ∈ (𝐴o 𝑦)) → (∅ ∈ 𝐴 → ∅ ∈ ((𝐴o 𝑦) ·o 𝐴)))
1913, 18syldanl 603 . . . . . . . . . 10 (((𝐴 ∈ On ∧ 𝑦 ∈ On) ∧ ∅ ∈ (𝐴o 𝑦)) → (∅ ∈ 𝐴 → ∅ ∈ ((𝐴o 𝑦) ·o 𝐴)))
20 oesuc 8130 . . . . . . . . . . . 12 ((𝐴 ∈ On ∧ 𝑦 ∈ On) → (𝐴o suc 𝑦) = ((𝐴o 𝑦) ·o 𝐴))
2120eleq2d 2896 . . . . . . . . . . 11 ((𝐴 ∈ On ∧ 𝑦 ∈ On) → (∅ ∈ (𝐴o suc 𝑦) ↔ ∅ ∈ ((𝐴o 𝑦) ·o 𝐴)))
2221adantr 483 . . . . . . . . . 10 (((𝐴 ∈ On ∧ 𝑦 ∈ On) ∧ ∅ ∈ (𝐴o 𝑦)) → (∅ ∈ (𝐴o suc 𝑦) ↔ ∅ ∈ ((𝐴o 𝑦) ·o 𝐴)))
2319, 22sylibrd 261 . . . . . . . . 9 (((𝐴 ∈ On ∧ 𝑦 ∈ On) ∧ ∅ ∈ (𝐴o 𝑦)) → (∅ ∈ 𝐴 → ∅ ∈ (𝐴o suc 𝑦)))
2423exp31 422 . . . . . . . 8 (𝐴 ∈ On → (𝑦 ∈ On → (∅ ∈ (𝐴o 𝑦) → (∅ ∈ 𝐴 → ∅ ∈ (𝐴o suc 𝑦)))))
2524com12 32 . . . . . . 7 (𝑦 ∈ On → (𝐴 ∈ On → (∅ ∈ (𝐴o 𝑦) → (∅ ∈ 𝐴 → ∅ ∈ (𝐴o suc 𝑦)))))
2625com34 91 . . . . . 6 (𝑦 ∈ On → (𝐴 ∈ On → (∅ ∈ 𝐴 → (∅ ∈ (𝐴o 𝑦) → ∅ ∈ (𝐴o suc 𝑦)))))
2726impd 413 . . . . 5 (𝑦 ∈ On → ((𝐴 ∈ On ∧ ∅ ∈ 𝐴) → (∅ ∈ (𝐴o 𝑦) → ∅ ∈ (𝐴o suc 𝑦))))
28 0ellim 6229 . . . . . . . . . . . 12 (Lim 𝑥 → ∅ ∈ 𝑥)
29 eqimss2 4003 . . . . . . . . . . . . 13 ((𝐴o ∅) = 1o → 1o ⊆ (𝐴o ∅))
3010, 29syl 17 . . . . . . . . . . . 12 (𝐴 ∈ On → 1o ⊆ (𝐴o ∅))
31 oveq2 7141 . . . . . . . . . . . . . 14 (𝑦 = ∅ → (𝐴o 𝑦) = (𝐴o ∅))
3231sseq2d 3978 . . . . . . . . . . . . 13 (𝑦 = ∅ → (1o ⊆ (𝐴o 𝑦) ↔ 1o ⊆ (𝐴o ∅)))
3332rspcev 3602 . . . . . . . . . . . 12 ((∅ ∈ 𝑥 ∧ 1o ⊆ (𝐴o ∅)) → ∃𝑦𝑥 1o ⊆ (𝐴o 𝑦))
3428, 30, 33syl2an 597 . . . . . . . . . . 11 ((Lim 𝑥𝐴 ∈ On) → ∃𝑦𝑥 1o ⊆ (𝐴o 𝑦))
35 ssiun 4946 . . . . . . . . . . 11 (∃𝑦𝑥 1o ⊆ (𝐴o 𝑦) → 1o 𝑦𝑥 (𝐴o 𝑦))
3634, 35syl 17 . . . . . . . . . 10 ((Lim 𝑥𝐴 ∈ On) → 1o 𝑦𝑥 (𝐴o 𝑦))
3736adantrr 715 . . . . . . . . 9 ((Lim 𝑥 ∧ (𝐴 ∈ On ∧ ∅ ∈ 𝐴)) → 1o 𝑦𝑥 (𝐴o 𝑦))
38 vex 3476 . . . . . . . . . . . 12 𝑥 ∈ V
39 oelim 8137 . . . . . . . . . . . 12 (((𝐴 ∈ On ∧ (𝑥 ∈ V ∧ Lim 𝑥)) ∧ ∅ ∈ 𝐴) → (𝐴o 𝑥) = 𝑦𝑥 (𝐴o 𝑦))
4038, 39mpanlr1 704 . . . . . . . . . . 11 (((𝐴 ∈ On ∧ Lim 𝑥) ∧ ∅ ∈ 𝐴) → (𝐴o 𝑥) = 𝑦𝑥 (𝐴o 𝑦))
4140anasss 469 . . . . . . . . . 10 ((𝐴 ∈ On ∧ (Lim 𝑥 ∧ ∅ ∈ 𝐴)) → (𝐴o 𝑥) = 𝑦𝑥 (𝐴o 𝑦))
4241an12s 647 . . . . . . . . 9 ((Lim 𝑥 ∧ (𝐴 ∈ On ∧ ∅ ∈ 𝐴)) → (𝐴o 𝑥) = 𝑦𝑥 (𝐴o 𝑦))
4337, 42sseqtrrd 3987 . . . . . . . 8 ((Lim 𝑥 ∧ (𝐴 ∈ On ∧ ∅ ∈ 𝐴)) → 1o ⊆ (𝐴o 𝑥))
44 limelon 6230 . . . . . . . . . . . 12 ((𝑥 ∈ V ∧ Lim 𝑥) → 𝑥 ∈ On)
4538, 44mpan 688 . . . . . . . . . . 11 (Lim 𝑥𝑥 ∈ On)
46 oecl 8140 . . . . . . . . . . . 12 ((𝐴 ∈ On ∧ 𝑥 ∈ On) → (𝐴o 𝑥) ∈ On)
4746ancoms 461 . . . . . . . . . . 11 ((𝑥 ∈ On ∧ 𝐴 ∈ On) → (𝐴o 𝑥) ∈ On)
4845, 47sylan 582 . . . . . . . . . 10 ((Lim 𝑥𝐴 ∈ On) → (𝐴o 𝑥) ∈ On)
49 eloni 6177 . . . . . . . . . 10 ((𝐴o 𝑥) ∈ On → Ord (𝐴o 𝑥))
50 ordgt0ge1 8100 . . . . . . . . . 10 (Ord (𝐴o 𝑥) → (∅ ∈ (𝐴o 𝑥) ↔ 1o ⊆ (𝐴o 𝑥)))
5148, 49, 503syl 18 . . . . . . . . 9 ((Lim 𝑥𝐴 ∈ On) → (∅ ∈ (𝐴o 𝑥) ↔ 1o ⊆ (𝐴o 𝑥)))
5251adantrr 715 . . . . . . . 8 ((Lim 𝑥 ∧ (𝐴 ∈ On ∧ ∅ ∈ 𝐴)) → (∅ ∈ (𝐴o 𝑥) ↔ 1o ⊆ (𝐴o 𝑥)))
5343, 52mpbird 259 . . . . . . 7 ((Lim 𝑥 ∧ (𝐴 ∈ On ∧ ∅ ∈ 𝐴)) → ∅ ∈ (𝐴o 𝑥))
5453ex 415 . . . . . 6 (Lim 𝑥 → ((𝐴 ∈ On ∧ ∅ ∈ 𝐴) → ∅ ∈ (𝐴o 𝑥)))
5554a1dd 50 . . . . 5 (Lim 𝑥 → ((𝐴 ∈ On ∧ ∅ ∈ 𝐴) → (∀𝑦𝑥 ∅ ∈ (𝐴o 𝑦) → ∅ ∈ (𝐴o 𝑥))))
562, 4, 6, 8, 12, 27, 55tfinds3 7557 . . . 4 (𝐵 ∈ On → ((𝐴 ∈ On ∧ ∅ ∈ 𝐴) → ∅ ∈ (𝐴o 𝐵)))
5756expd 418 . . 3 (𝐵 ∈ On → (𝐴 ∈ On → (∅ ∈ 𝐴 → ∅ ∈ (𝐴o 𝐵))))
5857com12 32 . 2 (𝐴 ∈ On → (𝐵 ∈ On → (∅ ∈ 𝐴 → ∅ ∈ (𝐴o 𝐵))))
5958imp31 420 1 (((𝐴 ∈ On ∧ 𝐵 ∈ On) ∧ ∅ ∈ 𝐴) → ∅ ∈ (𝐴o 𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 208  wa 398   = wceq 1537  wcel 2114  wral 3125  wrex 3126  Vcvv 3473  wss 3913  c0 4269   ciun 4895  Ord word 6166  Oncon0 6167  Lim wlim 6168  suc csuc 6169  (class class class)co 7133  1oc1o 8073   ·o comu 8078  o coe 8079
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2792  ax-rep 5166  ax-sep 5179  ax-nul 5186  ax-pow 5242  ax-pr 5306  ax-un 7439
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2891  df-nfc 2959  df-ne 3007  df-ral 3130  df-rex 3131  df-reu 3132  df-rab 3134  df-v 3475  df-sbc 3753  df-csb 3861  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-pss 3932  df-nul 4270  df-if 4444  df-pw 4517  df-sn 4544  df-pr 4546  df-tp 4548  df-op 4550  df-uni 4815  df-iun 4897  df-br 5043  df-opab 5105  df-mpt 5123  df-tr 5149  df-id 5436  df-eprel 5441  df-po 5450  df-so 5451  df-fr 5490  df-we 5492  df-xp 5537  df-rel 5538  df-cnv 5539  df-co 5540  df-dm 5541  df-rn 5542  df-res 5543  df-ima 5544  df-pred 6124  df-ord 6170  df-on 6171  df-lim 6172  df-suc 6173  df-iota 6290  df-fun 6333  df-fn 6334  df-f 6335  df-f1 6336  df-fo 6337  df-f1o 6338  df-fv 6339  df-ov 7136  df-oprab 7137  df-mpo 7138  df-om 7559  df-wrecs 7925  df-recs 7986  df-rdg 8024  df-1o 8080  df-oadd 8084  df-omul 8085  df-oexp 8086
This theorem is referenced by:  oeordi  8191  oeordsuc  8198  oeoelem  8202  oelimcl  8204  oeeui  8206  cantnflt  9113  cnfcom  9141  infxpenc  9422  infxpenc2  9426
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