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Theorem predprc 6340
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 6303 . 2 Pred(𝑅, 𝐴, 𝑋) = (𝐴 ∩ (◡𝑅 “ {𝑋}))
2 snprc 4678 . . . . . . 7 (¬ 𝑋 ∈ V ↔ {𝑋} = ∅)
32biimpi 219 . . . . . 6 (¬ 𝑋 ∈ V → {𝑋} = ∅)
43imaeq2d 6052 . . . . 5 (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = (◡𝑅 “ ∅))
5 ima0 6075 . . . . 5 (◡𝑅 “ ∅) = ∅
64, 5eqtrdi 2812 . . . 4 (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = ∅)
76ineq2d 4166 . . 3 (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = (𝐴 ∩ ∅))
8 in0 4345 . . 3 (𝐴 ∩ ∅) = ∅
97, 8eqtrdi 2812 . 2 (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = ∅)
101, 9eqtrid 2808 1 (¬ 𝑋 ∈ V → Pred(𝑅, 𝐴, 𝑋) = ∅)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3   → wi 4   = wceq 1570   ∈ wcel 2145  Vcvv 3451   ∩ cin 3898  ∅c0 4279  {csn 4584  ◡ccnv 5650   “ cima 5654  Predcpred 6302
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733  ax-sep 5249  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-xp 5657  df-cnv 5659  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-pred 6303
This theorem is used by:  predres  6341
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