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Theorem fn0g 13697
Description: The group zero extractor is a function. (Contributed by Stefan O'Rear, 10-Jan-2015.)
Assertion
Ref Expression
fn0g 0g Fn V

Proof of Theorem fn0g
Dummy variables 𝑒 𝑔 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-riota 6038 . . 3 (𝑒 ∈ (Base‘𝑔)∀𝑥 ∈ (Base‘𝑔)((𝑒(+g𝑔)𝑥) = 𝑥 ∧ (𝑥(+g𝑔)𝑒) = 𝑥)) = (℩𝑒(𝑒 ∈ (Base‘𝑔) ∧ ∀𝑥 ∈ (Base‘𝑔)((𝑒(+g𝑔)𝑥) = 𝑥 ∧ (𝑥(+g𝑔)𝑒) = 𝑥)))
2 basfn 13413 . . . . 5 Base Fn V
3 vex 2824 . . . . 5 𝑔 ∈ V
4 funfvex 5712 . . . . . 6 ((Fun Base ∧ 𝑔 ∈ dom Base) → (Base‘𝑔) ∈ V)
54funfni 5483 . . . . 5 ((Base Fn V ∧ 𝑔 ∈ V) → (Base‘𝑔) ∈ V)
62, 3, 5mp2an 430 . . . 4 (Base‘𝑔) ∈ V
7 riotaexg 6042 . . . 4 ((Base‘𝑔) ∈ V → (𝑒 ∈ (Base‘𝑔)∀𝑥 ∈ (Base‘𝑔)((𝑒(+g𝑔)𝑥) = 𝑥 ∧ (𝑥(+g𝑔)𝑒) = 𝑥)) ∈ V)
86, 7ax-mp 5 . . 3 (𝑒 ∈ (Base‘𝑔)∀𝑥 ∈ (Base‘𝑔)((𝑒(+g𝑔)𝑥) = 𝑥 ∧ (𝑥(+g𝑔)𝑒) = 𝑥)) ∈ V
91, 8eqeltrri 2312 . 2 (℩𝑒(𝑒 ∈ (Base‘𝑔) ∧ ∀𝑥 ∈ (Base‘𝑔)((𝑒(+g𝑔)𝑥) = 𝑥 ∧ (𝑥(+g𝑔)𝑒) = 𝑥))) ∈ V
10 df-0g 13614 . 2 0g = (𝑔 ∈ V ↦ (℩𝑒(𝑒 ∈ (Base‘𝑔) ∧ ∀𝑥 ∈ (Base‘𝑔)((𝑒(+g𝑔)𝑥) = 𝑥 ∧ (𝑥(+g𝑔)𝑒) = 𝑥))))
119, 10fnmpti 5512 1 0g Fn V
Colors of variables:    wff set class
This proof depends on syntax axioms:  wa 104   = wceq 1402  wcel 2209  wral 2528  Vcvv 2821  cio 5335   Fn wfn 5372  cfv 5377  crio 6037  (class class class)co 6085  Basecbs 13354  +gcplusg 13433  0gc0g 13612
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-cnex 8270  ax-resscn 8271  ax-1re 8273  ax-addrcl 8276
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-iota 5337  df-fun 5379  df-fn 5380  df-fv 5385  df-riota 6038  df-inn 9306  df-ndx 13357  df-slot 13358  df-base 13360  df-0g 13614
This theorem is used by:  fngzsum  13710  gzsumvalx  13711  gzsumfzval  13713  gzsum0  13715  0mhm  13795  mulgval  13927  mulgfng  13929  prdsidlem  14195  prdsinvlem  14198  pws0g  14215  ringidval  14267  issrg  14271  isdomn  14580
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