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Theorem eldprdi 18463
 Description: The domain of definition of the internal direct product, which states that 𝑆 is a family of subgroups that mutually commute and have trivial intersections. (Contributed by Mario Carneiro, 25-Apr-2016.) (Revised by AV, 14-Jul-2019.)
Hypotheses
Ref Expression
eldprdi.0 0 = (0g𝐺)
eldprdi.w 𝑊 = {X𝑖𝐼 (𝑆𝑖) ∣ finSupp 0 }
eldprdi.1 (𝜑𝐺dom DProd 𝑆)
eldprdi.2 (𝜑 → dom 𝑆 = 𝐼)
eldprdi.3 (𝜑𝐹𝑊)
Assertion
Ref Expression
eldprdi (𝜑 → (𝐺 Σg 𝐹) ∈ (𝐺 DProd 𝑆))
Distinct variable groups:   ,𝐹   ,𝑖,𝐺   ,𝐼,𝑖   0 ,   𝑆,,𝑖
Allowed substitution hints:   𝜑(,𝑖)   𝐹(𝑖)   𝑊(,𝑖)   0 (𝑖)

Proof of Theorem eldprdi
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 eldprdi.1 . 2 (𝜑𝐺dom DProd 𝑆)
2 eldprdi.3 . . 3 (𝜑𝐹𝑊)
3 eqid 2651 . . 3 (𝐺 Σg 𝐹) = (𝐺 Σg 𝐹)
4 oveq2 6698 . . . . 5 (𝑓 = 𝐹 → (𝐺 Σg 𝑓) = (𝐺 Σg 𝐹))
54eqeq2d 2661 . . . 4 (𝑓 = 𝐹 → ((𝐺 Σg 𝐹) = (𝐺 Σg 𝑓) ↔ (𝐺 Σg 𝐹) = (𝐺 Σg 𝐹)))
65rspcev 3340 . . 3 ((𝐹𝑊 ∧ (𝐺 Σg 𝐹) = (𝐺 Σg 𝐹)) → ∃𝑓𝑊 (𝐺 Σg 𝐹) = (𝐺 Σg 𝑓))
72, 3, 6sylancl 695 . 2 (𝜑 → ∃𝑓𝑊 (𝐺 Σg 𝐹) = (𝐺 Σg 𝑓))
8 eldprdi.2 . . 3 (𝜑 → dom 𝑆 = 𝐼)
9 eldprdi.0 . . . 4 0 = (0g𝐺)
10 eldprdi.w . . . 4 𝑊 = {X𝑖𝐼 (𝑆𝑖) ∣ finSupp 0 }
119, 10eldprd 18449 . . 3 (dom 𝑆 = 𝐼 → ((𝐺 Σg 𝐹) ∈ (𝐺 DProd 𝑆) ↔ (𝐺dom DProd 𝑆 ∧ ∃𝑓𝑊 (𝐺 Σg 𝐹) = (𝐺 Σg 𝑓))))
128, 11syl 17 . 2 (𝜑 → ((𝐺 Σg 𝐹) ∈ (𝐺 DProd 𝑆) ↔ (𝐺dom DProd 𝑆 ∧ ∃𝑓𝑊 (𝐺 Σg 𝐹) = (𝐺 Σg 𝑓))))
131, 7, 12mpbir2and 977 1 (𝜑 → (𝐺 Σg 𝐹) ∈ (𝐺 DProd 𝑆))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 383   = wceq 1523   ∈ wcel 2030  ∃wrex 2942  {crab 2945   class class class wbr 4685  dom cdm 5143  ‘cfv 5926  (class class class)co 6690  Xcixp 7950   finSupp cfsupp 8316  0gc0g 16147   Σg cgsu 16148   DProd cdprd 18438 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-1st 7210  df-2nd 7211  df-ixp 7951  df-dprd 18440 This theorem is referenced by:  dprdfsub  18466  dprdf11  18468  dprdsubg  18469  dprdub  18470  dpjidcl  18503
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