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Theorem reldmmpo 7322
Description: The domain of an operation defined by maps-to notation is a relation. (Contributed by Stefan O'Rear, 27-Nov-2014.)
Hypothesis
Ref Expression
rngop.1 𝐹 = (𝑥𝐴, 𝑦𝐵𝐶)
Assertion
Ref Expression
reldmmpo Rel dom 𝐹
Distinct variable groups:   𝑦,𝐴   𝑥,𝑦
Allowed substitution hints:   𝐴(𝑥)   𝐵(𝑥,𝑦)   𝐶(𝑥,𝑦)   𝐹(𝑥,𝑦)

Proof of Theorem reldmmpo
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 reldmoprab 7294 . 2 Rel dom {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥𝐴𝑦𝐵) ∧ 𝑧 = 𝐶)}
2 rngop.1 . . . . 5 𝐹 = (𝑥𝐴, 𝑦𝐵𝐶)
3 df-mpo 7196 . . . . 5 (𝑥𝐴, 𝑦𝐵𝐶) = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥𝐴𝑦𝐵) ∧ 𝑧 = 𝐶)}
42, 3eqtri 2759 . . . 4 𝐹 = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥𝐴𝑦𝐵) ∧ 𝑧 = 𝐶)}
54dmeqi 5758 . . 3 dom 𝐹 = dom {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥𝐴𝑦𝐵) ∧ 𝑧 = 𝐶)}
65releqi 5634 . 2 (Rel dom 𝐹 ↔ Rel dom {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥𝐴𝑦𝐵) ∧ 𝑧 = 𝐶)})
71, 6mpbir 234 1 Rel dom 𝐹
Colors of variables: wff setvar class
Syntax hints:  wa 399   = wceq 1543  wcel 2112  dom cdm 5536  Rel wrel 5541  {coprab 7192  cmpo 7193
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2018  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2160  ax-12 2177  ax-ext 2708  ax-sep 5177  ax-nul 5184  ax-pr 5307
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2073  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2728  df-clel 2809  df-nfc 2879  df-rab 3060  df-v 3400  df-dif 3856  df-un 3858  df-in 3860  df-ss 3870  df-nul 4224  df-if 4426  df-sn 4528  df-pr 4530  df-op 4534  df-br 5040  df-opab 5102  df-xp 5542  df-rel 5543  df-dm 5546  df-oprab 7195  df-mpo 7196
This theorem is referenced by:  reldmmap  8495  reldmrelexp  14549  reldmsets  16693  reldmress  16734  reldmprds  16907  gsum0  18110  reldmghm  18575  oppglsm  18985  reldmdprd  19338  reldmlmhm  20016  zrhval  20428  reldmdsmm  20649  frlmrcl  20673  reldmpsr  20827  reldmmpl  20906  reldmopsr  20956  reldmevls  20998  vr1val  21067  reldmevls1  21187  evl1fval  21198  matbas0pc  21260  mdetfval  21437  madufval  21488  qtopres  22549  fgabs  22730  reldmtng  23490  reldmnghm  23564  reldmnmhm  23565  dvbsss  24753  reldmmdeg  24906  nbgrprc0  27376  wwlksn  27875  reldmresv  31198  bj-restsnid  34942  mzpmfp  40213  brovmptimex  41255  1aryenef  45607  2aryenef  45618
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