Theorem predprc 6304

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 6267	. 2 ⊢ Pred(𝑅, 𝐴, 𝑋) = (𝐴 ∩ (◡𝑅 “ {𝑋}))
2		snprc 4676	. . . . . . 7 ⊢ (¬ 𝑋 ∈ V ↔ {𝑋} = ∅)
3	2	biimpi 216	. . . . . 6 ⊢ (¬ 𝑋 ∈ V → {𝑋} = ∅)
4	3	imaeq2d 6027	. . . . 5 ⊢ (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = (◡𝑅 “ ∅))
5		ima0 6044	. . . . 5 ⊢ (◡𝑅 “ ∅) = ∅
6	4, 5	eqtrdi 2788	. . . 4 ⊢ (¬ 𝑋 ∈ V → (◡𝑅 “ {𝑋}) = ∅)
7	6	ineq2d 4174	. . 3 ⊢ (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = (𝐴 ∩ ∅))
8		in0 4349	. . 3 ⊢ (𝐴 ∩ ∅) = ∅
9	7, 8	eqtrdi 2788	. 2 ⊢ (¬ 𝑋 ∈ V → (𝐴 ∩ (◡𝑅 “ {𝑋})) = ∅)
10	1, 9	eqtrid 2784	1 ⊢ (¬ 𝑋 ∈ V → Pred(𝑅, 𝐴, 𝑋) = ∅)

Syntax hints:  ¬ wn 3   → wi 4   = wceq 1542   ∈ wcel 2114  Vcvv 3442   ∩ cin 3902  ∅c0 4287  {csn 4582  ^◡ccnv 5631   “ cima 5635  Predcpred 6266

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-ext 2709  ax-sep 5243  ax-pr 5379

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-clab 2716  df-cleq 2729  df-clel 2812  df-rab 3402  df-v 3444  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-op 4589  df-br 5101  df-opab 5163  df-xp 5638  df-cnv 5640  df-dm 5642  df-rn 5643  df-res 5644  df-ima 5645  df-pred 6267

This theorem is referenced by:  predres  6305