Theorem predprc 6320

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 6283	. 2 ⊢ Pred(𝑅, 𝐴, 𝑋) = (𝐴 ∩ (◡𝑅 “ {𝑋}))
2		snprc 4673	. . . . . . 7 ⊢ (¬ 𝑋 ∈ V ↔ {𝑋} = ∅)
3	2	biimpi 218	. . . . . 6 ⊢ (¬ 𝑋 ∈ V → {𝑋} = ∅)
4	3	imaeq2d 6045	. . . . 5 ⊢ (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = (◡𝑅 “ ∅))
5		ima0 6062	. . . . 5 ⊢ (◡𝑅 “ ∅) = ∅
6	4, 5	eqtrdi 2812	. . . 4 ⊢ (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = ∅)
7	6	ineq2d 4170	. . 3 ⊢ (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = (𝐴 ∩ ∅))
8		in0 4346	. . 3 ⊢ (𝐴 ∩ ∅) = ∅
9	7, 8	eqtrdi 2812	. 2 ⊢ (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = ∅)
10	1, 9	eqtrid 2808	1 ⊢ (¬ 𝑋 ∈ V → Pred(𝑅, 𝐴, 𝑋) = ∅)

Syntax hints:  ¬ wn 3   → wi 4   = wceq 1559   ∈ wcel 2141  Vcvv 3453   ∩ cin 3901  ∅c0 4283  {csn 4579  ^◡ccnv 5642   “ cima 5646  Predcpred 6282

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-ext 2733  ax-sep 5243  ax-pr 5387

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-sb 2090  df-clab 2740  df-cleq 2753  df-clel 2836  df-rab 3414  df-v 3455  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4284  df-if 4478  df-sn 4580  df-pr 4582  df-op 4586  df-br 5098  df-opab 5160  df-xp 5649  df-cnv 5651  df-dm 5653  df-rn 5654  df-res 5655  df-ima 5656  df-pred 6283

This theorem is referenced by:  predres  6321