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Theorem pred0 5708
 Description: The predecessor class over ∅ is always ∅. (Contributed by Scott Fenton, 16-Apr-2011.) (Proof shortened by AV, 11-Jun-2021.)
Assertion
Ref Expression
pred0 Pred(𝑅, ∅, 𝑋) = ∅

Proof of Theorem pred0
StepHypRef Expression
1 df-pred 5678 . 2 Pred(𝑅, ∅, 𝑋) = (∅ ∩ (𝑅 “ {𝑋}))
2 0in 3967 . 2 (∅ ∩ (𝑅 “ {𝑋})) = ∅
31, 2eqtri 2643 1 Pred(𝑅, ∅, 𝑋) = ∅
 Colors of variables: wff setvar class Syntax hints:   = wceq 1482   ∩ cin 3571  ∅c0 3913  {csn 4175  ◡ccnv 5111   “ cima 5115  Predcpred 5677 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1721  ax-4 1736  ax-5 1838  ax-6 1887  ax-7 1934  ax-9 1998  ax-10 2018  ax-11 2033  ax-12 2046  ax-13 2245  ax-ext 2601 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-tru 1485  df-ex 1704  df-nf 1709  df-sb 1880  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2752  df-v 3200  df-dif 3575  df-in 3579  df-nul 3914  df-pred 5678 This theorem is referenced by:  trpred0  31720
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