Theorem predprc 6343

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 6306	. 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 6064	. . . . 5 ⊢ (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = (◡𝑅 “ ∅))
5		ima0 6081	. . . . 5 ⊢ (◡𝑅 “ ∅) = ∅
6	4, 5	eqtrdi 2816	. . . 4 ⊢ (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = ∅)
7	6	ineq2d 4173	. . 3 ⊢ (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = (𝐴 ∩ ∅))
8		in0 4352	. . 3 ⊢ (𝐴 ∩ ∅) = ∅
9	7, 8	eqtrdi 2816	. 2 ⊢ (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = ∅)
10	1, 9	eqtrid 2812	1 ⊢ (¬ 𝑋 ∈ V → Pred(𝑅, 𝐴, 𝑋) = ∅)

This proof depends on syntax axioms:  ¬ wn 3   → wi 4   = wceq 1570   ∈ wcel 2146  Vcvv 3457   ∩ cin 3905  ∅c0 4286  {csn 4591  ^◡ccnv 5662   “ cima 5666  Predcpred 6305

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 2148  ax-9 2156  ax-ext 2737  ax-sep 5259  ax-pr 5406

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 2744  df-cleq 2757  df-clel 2840  df-rab 3419  df-v 3459  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-sn 4592  df-pr 4594  df-op 4598  df-br 5112  df-opab 5176  df-xp 5669  df-cnv 5671  df-dm 5673  df-rn 5674  df-res 5675  df-ima 5676  df-pred 6306

This theorem is used by:  predres  6344