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Theorem predprc 6289
Description: The predecessor of a proper class is empty. (Contributed by Scott Fenton, 25-Nov-2024.)
Assertion
Ref Expression
predprc 𝑋 ∈ V → Pred(𝑅, 𝐴, 𝑋) = ∅)

Proof of Theorem predprc
StepHypRef Expression
1 df-pred 6252 . 2 Pred(𝑅, 𝐴, 𝑋) = (𝐴 ∩ (𝑅 “ {𝑋}))
2 snprc 4649 . . . . . . 7 𝑋 ∈ V ↔ {𝑋} = ∅)
32biimpi 217 . . . . . 6 𝑋 ∈ V → {𝑋} = ∅)
43imaeq2d 6012 . . . . 5 𝑋 ∈ V → (𝑅 “ {𝑋}) = (𝑅 “ ∅))
5 ima0 6029 . . . . 5 (𝑅 “ ∅) = ∅
64, 5eqtrdi 2790 . . . 4 𝑋 ∈ V → (𝑅 “ {𝑋}) = ∅)
76ineq2d 4149 . . 3 𝑋 ∈ V → (𝐴 ∩ (𝑅 “ {𝑋})) = (𝐴 ∩ ∅))
8 in0 4323 . . 3 (𝐴 ∩ ∅) = ∅
97, 8eqtrdi 2790 . 2 𝑋 ∈ V → (𝐴 ∩ (𝑅 “ {𝑋})) = ∅)
101, 9eqtrid 2786 1 𝑋 ∈ V → Pred(𝑅, 𝐴, 𝑋) = ∅)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1547  wcel 2119  Vcvv 3431  cin 3882  c0 4261  {csn 4555  ccnv 5617  cima 5621  Predcpred 6251
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-ext 2711  ax-sep 5218  ax-pr 5362
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-clab 2718  df-cleq 2731  df-clel 2814  df-rab 3392  df-v 3433  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4262  df-if 4455  df-sn 4556  df-pr 4558  df-op 4562  df-br 5073  df-opab 5135  df-xp 5624  df-cnv 5626  df-dm 5628  df-rn 5629  df-res 5630  df-ima 5631  df-pred 6252
This theorem is referenced by:  predres  6290
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