Theorem predprc 6336

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

Step	Hyp	Ref	Expression
1		df-pred 6299	. 2 ⊢ Pred(𝑅, 𝐴, 𝑋) = (𝐴 ∩ (◡𝑅 “ {𝑋}))
2		snprc 4685	. . . . . . 7 ⊢ (¬ 𝑋 ∈ V ↔ {𝑋} = ∅)
3	2	biimpi 219	. . . . . 6 ⊢ (¬ 𝑋 ∈ V → {𝑋} = ∅)
4	3	imaeq2d 6060	. . . . 5 ⊢ (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = (◡𝑅 “ ∅))
5		ima0 6077	. . . . 5 ⊢ (◡𝑅 “ ∅) = ∅
6	4, 5	eqtrdi 2820	. . . 4 ⊢ (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = ∅)
7	6	ineq2d 4181	. . 3 ⊢ (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = (𝐴 ∩ ∅))
8		in0 4358	. . 3 ⊢ (𝐴 ∩ ∅) = ∅
9	7, 8	eqtrdi 2820	. 2 ⊢ (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = ∅)
10	1, 9	eqtrid 2816	1 ⊢ (¬ 𝑋 ∈ V → Pred(𝑅, 𝐴, 𝑋) = ∅)

Syntax hints:  ¬ wn 3   → wi 4   = wceq 1567   ∈ wcel 2149  Vcvv 3463   ∩ cin 3912  ∅c0 4294  {csn 4591  ^◡ccnv 5658   “ cima 5662  Predcpred 6298

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-ext 2741  ax-sep 5258  ax-pr 5402

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-sb 2098  df-clab 2748  df-cleq 2761  df-clel 2844  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4490  df-sn 4592  df-pr 4594  df-op 4598  df-br 5111  df-opab 5175  df-xp 5665  df-cnv 5667  df-dm 5669  df-rn 5670  df-res 5671  df-ima 5672  df-pred 6299

This theorem is referenced by:  predres  6337