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Theorem dfse3 6341
Description: Alternate definition of set-like relationships. (Contributed by Scott Fenton, 19-Aug-2024.)
Assertion
Ref Expression
dfse3 (𝑅 Se 𝐴 ↔ ∀𝑥𝐴 Pred(𝑅, 𝐴, 𝑥) ∈ V)
Distinct variable groups:   𝑥,𝐴   𝑥,𝑅

Proof of Theorem dfse3
StepHypRef Expression
1 dfse2 6104 . 2 (𝑅 Se 𝐴 ↔ ∀𝑥𝐴 (𝐴 ∩ (𝑅 “ {𝑥})) ∈ V)
2 df-pred 6306 . . . 4 Pred(𝑅, 𝐴, 𝑥) = (𝐴 ∩ (𝑅 “ {𝑥}))
32eleq1i 2856 . . 3 (Pred(𝑅, 𝐴, 𝑥) ∈ V ↔ (𝐴 ∩ (𝑅 “ {𝑥})) ∈ V)
43ralbii 3113 . 2 (∀𝑥𝐴 Pred(𝑅, 𝐴, 𝑥) ∈ V ↔ ∀𝑥𝐴 (𝐴 ∩ (𝑅 “ {𝑥})) ∈ V)
51, 4bitr4i 281 1 (𝑅 Se 𝐴 ↔ ∀𝑥𝐴 Pred(𝑅, 𝐴, 𝑥) ∈ V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wb 209  wcel 2146  wral 3081  Vcvv 3457  cin 3905  {csn 4591   Se wse 5614  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-ral 3082  df-rex 3092  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-se 5617  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:  sexp2  8144  sexp3  8151  ttrclselem2  9698  ttrclse  9699
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