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Theorem snres0 6290
Description: Condition for restriction of a singleton to be empty. (Contributed by Scott Fenton, 9-Aug-2024.)
Hypothesis
Ref Expression
snres0.1 𝐵 ∈ V
Assertion
Ref Expression
snres0 (({⟨𝐴, 𝐵⟩} ↾ 𝐶) = ∅ ↔ ¬ 𝐴𝐶)

Proof of Theorem snres0
StepHypRef Expression
1 relres 6003 . . 3 Rel ({⟨𝐴, 𝐵⟩} ↾ 𝐶)
2 reldm0 5920 . . 3 (Rel ({⟨𝐴, 𝐵⟩} ↾ 𝐶) → (({⟨𝐴, 𝐵⟩} ↾ 𝐶) = ∅ ↔ dom ({⟨𝐴, 𝐵⟩} ↾ 𝐶) = ∅))
31, 2ax-mp 5 . 2 (({⟨𝐴, 𝐵⟩} ↾ 𝐶) = ∅ ↔ dom ({⟨𝐴, 𝐵⟩} ↾ 𝐶) = ∅)
4 dmres 5996 . . . 4 dom ({⟨𝐴, 𝐵⟩} ↾ 𝐶) = (𝐶 ∩ dom {⟨𝐴, 𝐵⟩})
5 snres0.1 . . . . . 6 𝐵 ∈ V
65dmsnop 6208 . . . . 5 dom {⟨𝐴, 𝐵⟩} = {𝐴}
76ineq2i 4204 . . . 4 (𝐶 ∩ dom {⟨𝐴, 𝐵⟩}) = (𝐶 ∩ {𝐴})
84, 7eqtri 2754 . . 3 dom ({⟨𝐴, 𝐵⟩} ↾ 𝐶) = (𝐶 ∩ {𝐴})
98eqeq1i 2731 . 2 (dom ({⟨𝐴, 𝐵⟩} ↾ 𝐶) = ∅ ↔ (𝐶 ∩ {𝐴}) = ∅)
10 disjsn 4710 . 2 ((𝐶 ∩ {𝐴}) = ∅ ↔ ¬ 𝐴𝐶)
113, 9, 103bitri 297 1 (({⟨𝐴, 𝐵⟩} ↾ 𝐶) = ∅ ↔ ¬ 𝐴𝐶)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wb 205   = wceq 1533  wcel 2098  Vcvv 3468  cin 3942  c0 4317  {csn 4623  cop 4629  dom cdm 5669  cres 5671  Rel wrel 5674
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-ext 2697  ax-sep 5292  ax-nul 5299  ax-pr 5420
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-sb 2060  df-clab 2704  df-cleq 2718  df-clel 2804  df-ral 3056  df-rex 3065  df-rab 3427  df-v 3470  df-dif 3946  df-un 3948  df-in 3950  df-ss 3960  df-nul 4318  df-if 4524  df-sn 4624  df-pr 4626  df-op 4630  df-br 5142  df-opab 5204  df-xp 5675  df-rel 5676  df-dm 5679  df-res 5681
This theorem is referenced by:  noinfbnd2lem1  27614
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