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Theorem dfcnv2 29816
Description: Alternative definition of the converse of a relation. (Contributed by Thierry Arnoux, 31-Mar-2018.)
Assertion
Ref Expression
dfcnv2 (ran 𝑅𝐴𝑅 = 𝑥𝐴 ({𝑥} × (𝑅 “ {𝑥})))
Distinct variable groups:   𝑥,𝐴   𝑥,𝑅

Proof of Theorem dfcnv2
Dummy variables 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 relcnv 5644 . 2 Rel 𝑅
2 relxp 5266 . . . 4 Rel ({𝑥} × (𝑅 “ {𝑥}))
32rgenw 3073 . . 3 𝑥𝐴 Rel ({𝑥} × (𝑅 “ {𝑥}))
4 reliun 5378 . . 3 (Rel 𝑥𝐴 ({𝑥} × (𝑅 “ {𝑥})) ↔ ∀𝑥𝐴 Rel ({𝑥} × (𝑅 “ {𝑥})))
53, 4mpbir 221 . 2 Rel 𝑥𝐴 ({𝑥} × (𝑅 “ {𝑥}))
6 vex 3354 . . . . . . . . 9 𝑧 ∈ V
7 vex 3354 . . . . . . . . 9 𝑦 ∈ V
86, 7opeldm 5466 . . . . . . . 8 (⟨𝑧, 𝑦⟩ ∈ 𝑅𝑧 ∈ dom 𝑅)
9 df-rn 5260 . . . . . . . 8 ran 𝑅 = dom 𝑅
108, 9syl6eleqr 2861 . . . . . . 7 (⟨𝑧, 𝑦⟩ ∈ 𝑅𝑧 ∈ ran 𝑅)
11 ssel2 3747 . . . . . . 7 ((ran 𝑅𝐴𝑧 ∈ ran 𝑅) → 𝑧𝐴)
1210, 11sylan2 572 . . . . . 6 ((ran 𝑅𝐴 ∧ ⟨𝑧, 𝑦⟩ ∈ 𝑅) → 𝑧𝐴)
1312ex 397 . . . . 5 (ran 𝑅𝐴 → (⟨𝑧, 𝑦⟩ ∈ 𝑅𝑧𝐴))
1413pm4.71rd 544 . . . 4 (ran 𝑅𝐴 → (⟨𝑧, 𝑦⟩ ∈ 𝑅 ↔ (𝑧𝐴 ∧ ⟨𝑧, 𝑦⟩ ∈ 𝑅)))
156, 7elimasn 5631 . . . . 5 (𝑦 ∈ (𝑅 “ {𝑧}) ↔ ⟨𝑧, 𝑦⟩ ∈ 𝑅)
1615anbi2i 601 . . . 4 ((𝑧𝐴𝑦 ∈ (𝑅 “ {𝑧})) ↔ (𝑧𝐴 ∧ ⟨𝑧, 𝑦⟩ ∈ 𝑅))
1714, 16syl6bbr 278 . . 3 (ran 𝑅𝐴 → (⟨𝑧, 𝑦⟩ ∈ 𝑅 ↔ (𝑧𝐴𝑦 ∈ (𝑅 “ {𝑧}))))
18 sneq 4326 . . . . 5 (𝑥 = 𝑧 → {𝑥} = {𝑧})
1918imaeq2d 5607 . . . 4 (𝑥 = 𝑧 → (𝑅 “ {𝑥}) = (𝑅 “ {𝑧}))
2019opeliunxp2 5399 . . 3 (⟨𝑧, 𝑦⟩ ∈ 𝑥𝐴 ({𝑥} × (𝑅 “ {𝑥})) ↔ (𝑧𝐴𝑦 ∈ (𝑅 “ {𝑧})))
2117, 20syl6bbr 278 . 2 (ran 𝑅𝐴 → (⟨𝑧, 𝑦⟩ ∈ 𝑅 ↔ ⟨𝑧, 𝑦⟩ ∈ 𝑥𝐴 ({𝑥} × (𝑅 “ {𝑥}))))
221, 5, 21eqrelrdv 5356 1 (ran 𝑅𝐴𝑅 = 𝑥𝐴 ({𝑥} × (𝑅 “ {𝑥})))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 382   = wceq 1631  wcel 2145  wral 3061  wss 3723  {csn 4316  cop 4322   ciun 4654   × cxp 5247  ccnv 5248  dom cdm 5249  ran crn 5250  cima 5252  Rel wrel 5254
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885  ax-5 1991  ax-6 2057  ax-7 2093  ax-9 2154  ax-10 2174  ax-11 2190  ax-12 2203  ax-13 2408  ax-ext 2751  ax-sep 4915  ax-nul 4923  ax-pr 5034
This theorem depends on definitions:  df-bi 197  df-an 383  df-or 827  df-3an 1073  df-tru 1634  df-ex 1853  df-nf 1858  df-sb 2050  df-eu 2622  df-mo 2623  df-clab 2758  df-cleq 2764  df-clel 2767  df-nfc 2902  df-ral 3066  df-rex 3067  df-rab 3070  df-v 3353  df-sbc 3588  df-csb 3683  df-dif 3726  df-un 3728  df-in 3730  df-ss 3737  df-nul 4064  df-if 4226  df-sn 4317  df-pr 4319  df-op 4323  df-iun 4656  df-br 4787  df-opab 4847  df-xp 5255  df-rel 5256  df-cnv 5257  df-dm 5259  df-rn 5260  df-res 5261  df-ima 5262
This theorem is referenced by:  gsummpt2co  30120
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