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Theorem dmtpos 8222
Description: The domain of tpos 𝐹 when dom 𝐹 is a relation. (Contributed by Mario Carneiro, 10-Sep-2015.)
Assertion
Ref Expression
dmtpos (Rel dom 𝐹 → dom tpos 𝐹 = dom 𝐹)

Proof of Theorem dmtpos
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 0nelxp 5710 . . . . 5 ¬ ∅ ∈ (V × V)
2 ssel 3975 . . . . 5 (dom 𝐹 ⊆ (V × V) → (∅ ∈ dom 𝐹 → ∅ ∈ (V × V)))
31, 2mtoi 198 . . . 4 (dom 𝐹 ⊆ (V × V) → ¬ ∅ ∈ dom 𝐹)
4 df-rel 5683 . . . 4 (Rel dom 𝐹 ↔ dom 𝐹 ⊆ (V × V))
5 reldmtpos 8218 . . . 4 (Rel dom tpos 𝐹 ↔ ¬ ∅ ∈ dom 𝐹)
63, 4, 53imtr4i 291 . . 3 (Rel dom 𝐹 → Rel dom tpos 𝐹)
7 relcnv 6103 . . 3 Rel dom 𝐹
86, 7jctir 521 . 2 (Rel dom 𝐹 → (Rel dom tpos 𝐹 ∧ Rel dom 𝐹))
9 vex 3478 . . . . . 6 𝑧 ∈ V
10 brtpos 8219 . . . . . 6 (𝑧 ∈ V → (⟨𝑥, 𝑦⟩tpos 𝐹𝑧 ↔ ⟨𝑦, 𝑥𝐹𝑧))
119, 10mp1i 13 . . . . 5 (Rel dom 𝐹 → (⟨𝑥, 𝑦⟩tpos 𝐹𝑧 ↔ ⟨𝑦, 𝑥𝐹𝑧))
1211exbidv 1924 . . . 4 (Rel dom 𝐹 → (∃𝑧𝑥, 𝑦⟩tpos 𝐹𝑧 ↔ ∃𝑧𝑦, 𝑥𝐹𝑧))
13 opex 5464 . . . . 5 𝑥, 𝑦⟩ ∈ V
1413eldm 5900 . . . 4 (⟨𝑥, 𝑦⟩ ∈ dom tpos 𝐹 ↔ ∃𝑧𝑥, 𝑦⟩tpos 𝐹𝑧)
15 vex 3478 . . . . . 6 𝑥 ∈ V
16 vex 3478 . . . . . 6 𝑦 ∈ V
1715, 16opelcnv 5881 . . . . 5 (⟨𝑥, 𝑦⟩ ∈ dom 𝐹 ↔ ⟨𝑦, 𝑥⟩ ∈ dom 𝐹)
18 opex 5464 . . . . . 6 𝑦, 𝑥⟩ ∈ V
1918eldm 5900 . . . . 5 (⟨𝑦, 𝑥⟩ ∈ dom 𝐹 ↔ ∃𝑧𝑦, 𝑥𝐹𝑧)
2017, 19bitri 274 . . . 4 (⟨𝑥, 𝑦⟩ ∈ dom 𝐹 ↔ ∃𝑧𝑦, 𝑥𝐹𝑧)
2112, 14, 203bitr4g 313 . . 3 (Rel dom 𝐹 → (⟨𝑥, 𝑦⟩ ∈ dom tpos 𝐹 ↔ ⟨𝑥, 𝑦⟩ ∈ dom 𝐹))
2221eqrelrdv2 5795 . 2 (((Rel dom tpos 𝐹 ∧ Rel dom 𝐹) ∧ Rel dom 𝐹) → dom tpos 𝐹 = dom 𝐹)
238, 22mpancom 686 1 (Rel dom 𝐹 → dom tpos 𝐹 = dom 𝐹)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205  wa 396   = wceq 1541  wex 1781  wcel 2106  Vcvv 3474  wss 3948  c0 4322  cop 4634   class class class wbr 5148   × cxp 5674  ccnv 5675  dom cdm 5676  Rel wrel 5681  tpos ctpos 8209
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-sep 5299  ax-nul 5306  ax-pow 5363  ax-pr 5427  ax-un 7724
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-eu 2563  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ne 2941  df-ral 3062  df-rex 3071  df-rab 3433  df-v 3476  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-br 5149  df-opab 5211  df-mpt 5232  df-id 5574  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-res 5688  df-ima 5689  df-iota 6495  df-fun 6545  df-fn 6546  df-fv 6551  df-tpos 8210
This theorem is referenced by:  rntpos  8223  dftpos2  8227  dftpos3  8228  tposfn2  8232
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