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Theorem fnoei 6449
Description: Functionality and domain of ordinal exponentiation. (Contributed by Mario Carneiro, 29-May-2015.) (Revised by Mario Carneiro, 3-Jul-2019.)
Assertion
Ref Expression
fnoei o Fn (On × On)

Proof of Theorem fnoei
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-oexpi 6419 . 2 o = (𝑥 ∈ On, 𝑦 ∈ On ↦ (rec((𝑧 ∈ V ↦ (𝑧 ·o 𝑥)), 1o)‘𝑦))
2 vex 2740 . . 3 𝑦 ∈ V
3 1on 6420 . . . . 5 1o ∈ On
43elexi 2749 . . . 4 1o ∈ V
5 vex 2740 . . . . . 6 𝑧 ∈ V
6 vex 2740 . . . . . 6 𝑥 ∈ V
7 omexg 6448 . . . . . 6 ((𝑧 ∈ V ∧ 𝑥 ∈ V) → (𝑧 ·o 𝑥) ∈ V)
85, 6, 7mp2an 426 . . . . 5 (𝑧 ·o 𝑥) ∈ V
9 eqid 2177 . . . . 5 (𝑧 ∈ V ↦ (𝑧 ·o 𝑥)) = (𝑧 ∈ V ↦ (𝑧 ·o 𝑥))
108, 9fnmpti 5342 . . . 4 (𝑧 ∈ V ↦ (𝑧 ·o 𝑥)) Fn V
114, 10rdgexg 6386 . . 3 (𝑦 ∈ V → (rec((𝑧 ∈ V ↦ (𝑧 ·o 𝑥)), 1o)‘𝑦) ∈ V)
122, 11ax-mp 5 . 2 (rec((𝑧 ∈ V ↦ (𝑧 ·o 𝑥)), 1o)‘𝑦) ∈ V
131, 12fnmpoi 6201 1 o Fn (On × On)
Colors of variables: wff set class
Syntax hints:  wcel 2148  Vcvv 2737  cmpt 4063  Oncon0 4362   × cxp 4623   Fn wfn 5209  cfv 5214  (class class class)co 5871  reccrdg 6366  1oc1o 6406   ·o comu 6411  o coei 6412
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-coll 4117  ax-sep 4120  ax-nul 4128  ax-pow 4173  ax-pr 4208  ax-un 4432  ax-setind 4535
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-ral 2460  df-rex 2461  df-reu 2462  df-rab 2464  df-v 2739  df-sbc 2963  df-csb 3058  df-dif 3131  df-un 3133  df-in 3135  df-ss 3142  df-nul 3423  df-pw 3577  df-sn 3598  df-pr 3599  df-op 3601  df-uni 3810  df-iun 3888  df-br 4003  df-opab 4064  df-mpt 4065  df-tr 4101  df-id 4292  df-iord 4365  df-on 4367  df-suc 4370  df-xp 4631  df-rel 4632  df-cnv 4633  df-co 4634  df-dm 4635  df-rn 4636  df-res 4637  df-ima 4638  df-iota 5176  df-fun 5216  df-fn 5217  df-f 5218  df-f1 5219  df-fo 5220  df-f1o 5221  df-fv 5222  df-ov 5874  df-oprab 5875  df-mpo 5876  df-1st 6137  df-2nd 6138  df-recs 6302  df-irdg 6367  df-1o 6413  df-oadd 6417  df-omul 6418  df-oexpi 6419
This theorem is referenced by: (None)
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