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Theorem cnvimadfsn 8114
Description: The support of functions "defined" by inverse images expressed by binary relations. (Contributed by AV, 7-Apr-2019.)
Assertion
Ref Expression
cnvimadfsn (𝑅 “ (V ∖ {𝑍})) = {𝑥 ∣ ∃𝑦(𝑥𝑅𝑦𝑦𝑍)}
Distinct variable groups:   𝑥,𝑅,𝑦   𝑥,𝑍,𝑦

Proof of Theorem cnvimadfsn
StepHypRef Expression
1 dfima3 6022 . 2 (𝑅 “ (V ∖ {𝑍})) = {𝑥 ∣ ∃𝑦(𝑦 ∈ (V ∖ {𝑍}) ∧ ⟨𝑦, 𝑥⟩ ∈ 𝑅)}
2 eldifvsn 4753 . . . . . 6 (𝑦 ∈ V → (𝑦 ∈ (V ∖ {𝑍}) ↔ 𝑦𝑍))
32elv 3445 . . . . 5 (𝑦 ∈ (V ∖ {𝑍}) ↔ 𝑦𝑍)
4 vex 3444 . . . . . . 7 𝑦 ∈ V
5 vex 3444 . . . . . . 7 𝑥 ∈ V
64, 5opelcnv 5830 . . . . . 6 (⟨𝑦, 𝑥⟩ ∈ 𝑅 ↔ ⟨𝑥, 𝑦⟩ ∈ 𝑅)
7 df-br 5099 . . . . . 6 (𝑥𝑅𝑦 ↔ ⟨𝑥, 𝑦⟩ ∈ 𝑅)
86, 7bitr4i 278 . . . . 5 (⟨𝑦, 𝑥⟩ ∈ 𝑅𝑥𝑅𝑦)
93, 8anbi12ci 629 . . . 4 ((𝑦 ∈ (V ∖ {𝑍}) ∧ ⟨𝑦, 𝑥⟩ ∈ 𝑅) ↔ (𝑥𝑅𝑦𝑦𝑍))
109exbii 1849 . . 3 (∃𝑦(𝑦 ∈ (V ∖ {𝑍}) ∧ ⟨𝑦, 𝑥⟩ ∈ 𝑅) ↔ ∃𝑦(𝑥𝑅𝑦𝑦𝑍))
1110abbii 2803 . 2 {𝑥 ∣ ∃𝑦(𝑦 ∈ (V ∖ {𝑍}) ∧ ⟨𝑦, 𝑥⟩ ∈ 𝑅)} = {𝑥 ∣ ∃𝑦(𝑥𝑅𝑦𝑦𝑍)}
121, 11eqtri 2759 1 (𝑅 “ (V ∖ {𝑍})) = {𝑥 ∣ ∃𝑦(𝑥𝑅𝑦𝑦𝑍)}
Colors of variables: wff setvar class
Syntax hints:  wb 206  wa 395   = wceq 1541  wex 1780  wcel 2113  {cab 2714  wne 2932  Vcvv 3440  cdif 3898  {csn 4580  cop 4586   class class class wbr 5098  ccnv 5623  cima 5627
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-ext 2708  ax-sep 5241  ax-nul 5251  ax-pr 5377
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2068  df-clab 2715  df-cleq 2728  df-clel 2811  df-ne 2933  df-ral 3052  df-rex 3061  df-rab 3400  df-v 3442  df-dif 3904  df-un 3906  df-in 3908  df-ss 3918  df-nul 4286  df-if 4480  df-sn 4581  df-pr 4583  df-op 4587  df-br 5099  df-opab 5161  df-xp 5630  df-cnv 5632  df-dm 5634  df-rn 5635  df-res 5636  df-ima 5637
This theorem is referenced by:  suppimacnvss  8115  suppimacnv  8116
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