Theorem reldmdprd 20264

Description: The domain of the internal direct product operation is a relation. (Contributed by Mario Carneiro, 25-Apr-2016.) (Proof shortened by AV, 11-Jul-2019.)

Assertion

Ref	Expression
reldmdprd	⊢ Rel dom DProd

Proof of Theorem reldmdprd

Dummy variables 𝑔 ℎ 𝑓 𝑠 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-dprd 20262	. 2 ⊢ DProd = (𝑔 ∈ Grp, 𝑠 ∈ {ℎ ∣ (ℎ:dom ℎ⟶(SubGrp‘𝑔) ∧ ∀𝑥 ∈ dom ℎ(∀𝑦 ∈ (dom ℎ ∖ {𝑥})(ℎ‘𝑥) ⊆ ((Cntz‘𝑔)‘(ℎ‘𝑦)) ∧ ((ℎ‘𝑥) ∩ ((mrCls‘(SubGrp‘𝑔))‘∪ (ℎ “ (dom ℎ ∖ {𝑥})))) = {(0g‘𝑔)}))} ↦ ran (𝑓 ∈ {ℎ ∈ X𝑥 ∈ dom 𝑠(𝑠‘𝑥) ∣ ℎ finSupp (0g‘𝑔)} ↦ (𝑔 Σg 𝑓)))
2	1	reldmmpo 7584	1 ⊢ Rel dom DProd

This proof depends on syntax axioms:   ∧ wa 401   = wceq 1570  {cab 2741  ∀wral 3080  {crab 3416   ⊆ wss 3900   ∖ cdif 4048   ∩ cin 4092  {csn 4588  ∪ cuni 4872   class class class wbr 5108   ↦ cmpt 5192  dom cdm 5658  ran crn 5659   “ cima 5661  Rel wrel 5663  ⟶wf 6562  ‘cfv 6566  (class class class)co 7451  Xcixp 8963   finSupp cfsupp 9391  0_gc0g 17660   Σ_g cgsu 17661  mrClscmrc 17803  Grpcgrp 19194  SubGrpcsubg 19380  Cntzccntz 19580   DProd cdprd 20260

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-sep 5255  ax-pr 5398

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4841  df-br 5109  df-opab 5174  df-xp 5664  df-rel 5665  df-dm 5668  df-oprab 7455  df-mpo 7456  df-dprd 20262

This theorem is used by:  dprddomprc  20267  dprdval0prc  20269  dprdval  20270  dprdgrp  20272  dprdf  20273  dprdssv  20283  subgdmdprd  20301  dprd2da  20309  dpjfval  20322