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Theorem mulgfng 13841
Description: Functionality of the group multiple operation. (Contributed by Mario Carneiro, 21-Mar-2015.) (Revised by Mario Carneiro, 2-Oct-2015.)
Hypotheses
Ref Expression
mulgfn.b 𝐵 = (Base‘𝐺)
mulgfn.t · = (.g𝐺)
Assertion
Ref Expression
mulgfng (𝐺𝑉· Fn (ℤ × 𝐵))

Proof of Theorem mulgfng
Dummy variables 𝑢 𝑣 𝑛 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 elex 2825 . . . . . . 7 (𝐺𝑉𝐺 ∈ V)
2 fn0g 13588 . . . . . . . 8 0g Fn V
3 funfvex 5687 . . . . . . . . 9 ((Fun 0g𝐺 ∈ dom 0g) → (0g𝐺) ∈ V)
43funfni 5458 . . . . . . . 8 ((0g Fn V ∧ 𝐺 ∈ V) → (0g𝐺) ∈ V)
52, 4mpan 424 . . . . . . 7 (𝐺 ∈ V → (0g𝐺) ∈ V)
61, 5syl 14 . . . . . 6 (𝐺𝑉 → (0g𝐺) ∈ V)
76ad2antrr 488 . . . . 5 (((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ 𝑛 = 0) → (0g𝐺) ∈ V)
8 nnuz 9890 . . . . . . . . . 10 ℕ = (ℤ‘1)
9 1zzd 9604 . . . . . . . . . 10 ((𝐺𝑉𝑥𝐵) → 1 ∈ ℤ)
10 fvconst2g 5898 . . . . . . . . . . . . 13 ((𝑥𝐵𝑢 ∈ ℕ) → ((ℕ × {𝑥})‘𝑢) = 𝑥)
11 simpl 109 . . . . . . . . . . . . 13 ((𝑥𝐵𝑢 ∈ ℕ) → 𝑥𝐵)
1210, 11eqeltrd 2309 . . . . . . . . . . . 12 ((𝑥𝐵𝑢 ∈ ℕ) → ((ℕ × {𝑥})‘𝑢) ∈ 𝐵)
1312elexd 2827 . . . . . . . . . . 11 ((𝑥𝐵𝑢 ∈ ℕ) → ((ℕ × {𝑥})‘𝑢) ∈ V)
1413adantll 476 . . . . . . . . . 10 (((𝐺𝑉𝑥𝐵) ∧ 𝑢 ∈ ℕ) → ((ℕ × {𝑥})‘𝑢) ∈ V)
15 simprl 531 . . . . . . . . . . 11 (((𝐺𝑉𝑥𝐵) ∧ (𝑢 ∈ V ∧ 𝑣 ∈ V)) → 𝑢 ∈ V)
16 plusgslid 13325 . . . . . . . . . . . . 13 (+g = Slot (+g‘ndx) ∧ (+g‘ndx) ∈ ℕ)
1716slotex 13239 . . . . . . . . . . . 12 (𝐺𝑉 → (+g𝐺) ∈ V)
1817ad2antrr 488 . . . . . . . . . . 11 (((𝐺𝑉𝑥𝐵) ∧ (𝑢 ∈ V ∧ 𝑣 ∈ V)) → (+g𝐺) ∈ V)
19 simprr 533 . . . . . . . . . . 11 (((𝐺𝑉𝑥𝐵) ∧ (𝑢 ∈ V ∧ 𝑣 ∈ V)) → 𝑣 ∈ V)
20 ovexg 6084 . . . . . . . . . . 11 ((𝑢 ∈ V ∧ (+g𝐺) ∈ V ∧ 𝑣 ∈ V) → (𝑢(+g𝐺)𝑣) ∈ V)
2115, 18, 19, 20syl3anc 1274 . . . . . . . . . 10 (((𝐺𝑉𝑥𝐵) ∧ (𝑢 ∈ V ∧ 𝑣 ∈ V)) → (𝑢(+g𝐺)𝑣) ∈ V)
228, 9, 14, 21seqf 10826 . . . . . . . . 9 ((𝐺𝑉𝑥𝐵) → seq1((+g𝐺), (ℕ × {𝑥})):ℕ⟶V)
2322adantrl 478 . . . . . . . 8 ((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) → seq1((+g𝐺), (ℕ × {𝑥})):ℕ⟶V)
2423ad2antrr 488 . . . . . . 7 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ 0 < 𝑛) → seq1((+g𝐺), (ℕ × {𝑥})):ℕ⟶V)
25 simprl 531 . . . . . . . . 9 ((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) → 𝑛 ∈ ℤ)
2625ad2antrr 488 . . . . . . . 8 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ 0 < 𝑛) → 𝑛 ∈ ℤ)
27 simpr 110 . . . . . . . 8 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ 0 < 𝑛) → 0 < 𝑛)
28 elnnz 9587 . . . . . . . 8 (𝑛 ∈ ℕ ↔ (𝑛 ∈ ℤ ∧ 0 < 𝑛))
2926, 27, 28sylanbrc 417 . . . . . . 7 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ 0 < 𝑛) → 𝑛 ∈ ℕ)
3024, 29ffvelcdmd 5813 . . . . . 6 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ 0 < 𝑛) → (seq1((+g𝐺), (ℕ × {𝑥}))‘𝑛) ∈ V)
31 mulgfn.b . . . . . . . . . 10 𝐵 = (Base‘𝐺)
32 eqid 2232 . . . . . . . . . 10 (invg𝐺) = (invg𝐺)
3331, 32grpinvfng 13757 . . . . . . . . 9 (𝐺𝑉 → (invg𝐺) Fn 𝐵)
34 basfn 13271 . . . . . . . . . . . 12 Base Fn V
35 funfvex 5687 . . . . . . . . . . . . 13 ((Fun Base ∧ 𝐺 ∈ dom Base) → (Base‘𝐺) ∈ V)
3635funfni 5458 . . . . . . . . . . . 12 ((Base Fn V ∧ 𝐺 ∈ V) → (Base‘𝐺) ∈ V)
3734, 36mpan 424 . . . . . . . . . . 11 (𝐺 ∈ V → (Base‘𝐺) ∈ V)
3831, 37eqeltrid 2319 . . . . . . . . . 10 (𝐺 ∈ V → 𝐵 ∈ V)
391, 38syl 14 . . . . . . . . 9 (𝐺𝑉𝐵 ∈ V)
40 fnex 5906 . . . . . . . . 9 (((invg𝐺) Fn 𝐵𝐵 ∈ V) → (invg𝐺) ∈ V)
4133, 39, 40syl2anc 411 . . . . . . . 8 (𝐺𝑉 → (invg𝐺) ∈ V)
4241ad3antrrr 492 . . . . . . 7 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → (invg𝐺) ∈ V)
4323ad2antrr 488 . . . . . . . 8 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → seq1((+g𝐺), (ℕ × {𝑥})):ℕ⟶V)
4425znegcld 9702 . . . . . . . . . 10 ((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) → -𝑛 ∈ ℤ)
4544ad2antrr 488 . . . . . . . . 9 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → -𝑛 ∈ ℤ)
46 simplr 529 . . . . . . . . . . 11 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → ¬ 𝑛 = 0)
47 simpr 110 . . . . . . . . . . 11 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → ¬ 0 < 𝑛)
48 ztri3or0 9619 . . . . . . . . . . . . 13 (𝑛 ∈ ℤ → (𝑛 < 0 ∨ 𝑛 = 0 ∨ 0 < 𝑛))
4925, 48syl 14 . . . . . . . . . . . 12 ((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) → (𝑛 < 0 ∨ 𝑛 = 0 ∨ 0 < 𝑛))
5049ad2antrr 488 . . . . . . . . . . 11 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → (𝑛 < 0 ∨ 𝑛 = 0 ∨ 0 < 𝑛))
5146, 47, 50ecase23d 1387 . . . . . . . . . 10 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → 𝑛 < 0)
5225zred 9700 . . . . . . . . . . . 12 ((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) → 𝑛 ∈ ℝ)
5352ad2antrr 488 . . . . . . . . . . 11 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → 𝑛 ∈ ℝ)
5453lt0neg1d 8789 . . . . . . . . . 10 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → (𝑛 < 0 ↔ 0 < -𝑛))
5551, 54mpbid 147 . . . . . . . . 9 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → 0 < -𝑛)
56 elnnz 9587 . . . . . . . . 9 (-𝑛 ∈ ℕ ↔ (-𝑛 ∈ ℤ ∧ 0 < -𝑛))
5745, 55, 56sylanbrc 417 . . . . . . . 8 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → -𝑛 ∈ ℕ)
5843, 57ffvelcdmd 5813 . . . . . . 7 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → (seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛) ∈ V)
59 fvexg 5689 . . . . . . 7 (((invg𝐺) ∈ V ∧ (seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛) ∈ V) → ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛)) ∈ V)
6042, 58, 59syl2anc 411 . . . . . 6 ((((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) ∧ ¬ 0 < 𝑛) → ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛)) ∈ V)
61 0zd 9589 . . . . . . 7 (((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) → 0 ∈ ℤ)
62 simplrl 537 . . . . . . 7 (((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) → 𝑛 ∈ ℤ)
63 zdclt 9655 . . . . . . 7 ((0 ∈ ℤ ∧ 𝑛 ∈ ℤ) → DECID 0 < 𝑛)
6461, 62, 63syl2anc 411 . . . . . 6 (((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) → DECID 0 < 𝑛)
6530, 60, 64ifcldadc 3652 . . . . 5 (((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) ∧ ¬ 𝑛 = 0) → if(0 < 𝑛, (seq1((+g𝐺), (ℕ × {𝑥}))‘𝑛), ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛))) ∈ V)
66 0zd 9589 . . . . . 6 ((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) → 0 ∈ ℤ)
67 zdceq 9653 . . . . . 6 ((𝑛 ∈ ℤ ∧ 0 ∈ ℤ) → DECID 𝑛 = 0)
6825, 66, 67syl2anc 411 . . . . 5 ((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) → DECID 𝑛 = 0)
697, 65, 68ifcldadc 3652 . . . 4 ((𝐺𝑉 ∧ (𝑛 ∈ ℤ ∧ 𝑥𝐵)) → if(𝑛 = 0, (0g𝐺), if(0 < 𝑛, (seq1((+g𝐺), (ℕ × {𝑥}))‘𝑛), ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛)))) ∈ V)
7069ralrimivva 2624 . . 3 (𝐺𝑉 → ∀𝑛 ∈ ℤ ∀𝑥𝐵 if(𝑛 = 0, (0g𝐺), if(0 < 𝑛, (seq1((+g𝐺), (ℕ × {𝑥}))‘𝑛), ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛)))) ∈ V)
71 eqid 2232 . . . 4 (𝑛 ∈ ℤ, 𝑥𝐵 ↦ if(𝑛 = 0, (0g𝐺), if(0 < 𝑛, (seq1((+g𝐺), (ℕ × {𝑥}))‘𝑛), ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛))))) = (𝑛 ∈ ℤ, 𝑥𝐵 ↦ if(𝑛 = 0, (0g𝐺), if(0 < 𝑛, (seq1((+g𝐺), (ℕ × {𝑥}))‘𝑛), ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛)))))
7271fnmpo 6398 . . 3 (∀𝑛 ∈ ℤ ∀𝑥𝐵 if(𝑛 = 0, (0g𝐺), if(0 < 𝑛, (seq1((+g𝐺), (ℕ × {𝑥}))‘𝑛), ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛)))) ∈ V → (𝑛 ∈ ℤ, 𝑥𝐵 ↦ if(𝑛 = 0, (0g𝐺), if(0 < 𝑛, (seq1((+g𝐺), (ℕ × {𝑥}))‘𝑛), ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛))))) Fn (ℤ × 𝐵))
7370, 72syl 14 . 2 (𝐺𝑉 → (𝑛 ∈ ℤ, 𝑥𝐵 ↦ if(𝑛 = 0, (0g𝐺), if(0 < 𝑛, (seq1((+g𝐺), (ℕ × {𝑥}))‘𝑛), ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛))))) Fn (ℤ × 𝐵))
74 eqid 2232 . . . 4 (+g𝐺) = (+g𝐺)
75 eqid 2232 . . . 4 (0g𝐺) = (0g𝐺)
76 mulgfn.t . . . 4 · = (.g𝐺)
7731, 74, 75, 32, 76mulgfvalg 13838 . . 3 (𝐺𝑉· = (𝑛 ∈ ℤ, 𝑥𝐵 ↦ if(𝑛 = 0, (0g𝐺), if(0 < 𝑛, (seq1((+g𝐺), (ℕ × {𝑥}))‘𝑛), ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛))))))
7877fneq1d 5446 . 2 (𝐺𝑉 → ( · Fn (ℤ × 𝐵) ↔ (𝑛 ∈ ℤ, 𝑥𝐵 ↦ if(𝑛 = 0, (0g𝐺), if(0 < 𝑛, (seq1((+g𝐺), (ℕ × {𝑥}))‘𝑛), ((invg𝐺)‘(seq1((+g𝐺), (ℕ × {𝑥}))‘-𝑛))))) Fn (ℤ × 𝐵)))
7973, 78mpbird 167 1 (𝐺𝑉· Fn (ℤ × 𝐵))
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 104  DECID wdc 842  w3o 1004   = wceq 1398  wcel 2203  wral 2520  Vcvv 2813  ifcif 3620  {csn 3689   class class class wbr 4109   × cxp 4747   Fn wfn 5347  wf 5348  cfv 5352  (class class class)co 6050  cmpo 6052  cr 8126  0cc0 8127  1c1 8128   < clt 8308  -cneg 8445  cn 9237  cz 9577  seqcseq 10809  Basecbs 13212  +gcplusg 13290  0gc0g 13469  invgcminusg 13714  .gcmg 13836
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-coll 4225  ax-sep 4228  ax-nul 4236  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659  ax-iinf 4710  ax-cnex 8218  ax-resscn 8219  ax-1cn 8220  ax-1re 8221  ax-icn 8222  ax-addcl 8223  ax-addrcl 8224  ax-mulcl 8225  ax-addcom 8227  ax-addass 8229  ax-distr 8231  ax-i2m1 8232  ax-0lt1 8233  ax-0id 8235  ax-rnegex 8236  ax-cnre 8238  ax-pre-ltirr 8239  ax-pre-ltwlin 8240  ax-pre-lttrn 8241  ax-pre-ltadd 8243
This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-reu 2527  df-rab 2529  df-v 2815  df-sbc 3043  df-csb 3139  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-nul 3509  df-if 3621  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-int 3950  df-iun 3993  df-br 4110  df-opab 4172  df-mpt 4173  df-tr 4209  df-id 4414  df-iord 4487  df-on 4489  df-ilim 4490  df-suc 4492  df-iom 4713  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-f1 5357  df-fo 5358  df-f1o 5359  df-fv 5360  df-riota 6003  df-ov 6053  df-oprab 6054  df-mpo 6055  df-1st 6334  df-2nd 6335  df-recs 6536  df-frec 6622  df-pnf 8310  df-mnf 8311  df-xr 8312  df-ltxr 8313  df-le 8314  df-sub 8446  df-neg 8447  df-inn 9238  df-2 9296  df-n0 9497  df-z 9578  df-uz 9854  df-seqfrec 10810  df-ndx 13215  df-slot 13216  df-base 13218  df-plusg 13303  df-0g 13471  df-minusg 13717  df-mulg 13837
This theorem is referenced by: (None)
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