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Theorem dfpre2 38976
Description: Alternate definition of the successor-predecessor. (Contributed by Peter Mazsa, 12-Jan-2026.)
Assertion
Ref Expression
dfpre2 (𝑁𝑉 → pre 𝑁 = (℩𝑚𝑚 SucMap 𝑁))
Distinct variable groups:   𝑚,𝑁   𝑚,𝑉

Proof of Theorem dfpre2
StepHypRef Expression
1 dfpre 38975 . 2 pre 𝑁 = (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁))
2 elpredg 6302 . . . 4 ((𝑁𝑉𝑚 ∈ V) → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁))
32elvd 3460 . . 3 (𝑁𝑉 → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁))
43iotabidv 6505 . 2 (𝑁𝑉 → (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁)) = (℩𝑚𝑚 SucMap 𝑁))
51, 4eqtrid 2809 1 (𝑁𝑉 → pre 𝑁 = (℩𝑚𝑚 SucMap 𝑁))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 208   = wceq 1560  wcel 2142  Vcvv 3454   class class class wbr 5100  Predcpred 6287  cio 6475   SucMap csucmap 38677   pre cpre 38679
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1815  ax-4 1829  ax-5 1930  ax-6 1987  ax-7 2028  ax-8 2144  ax-9 2152  ax-ext 2734  ax-sep 5246  ax-pr 5390  ax-un 7718
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1100  df-tru 1563  df-fal 1573  df-ex 1800  df-sb 2091  df-clab 2741  df-cleq 2754  df-clel 2837  df-ral 3077  df-rex 3087  df-rab 3415  df-v 3456  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4481  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-opab 5163  df-xp 5653  df-cnv 5655  df-dm 5657  df-rn 5658  df-res 5659  df-ima 5660  df-pred 6288  df-suc 6352  df-iota 6477  df-sucmap 38961  df-pre 38974
This theorem is referenced by:  dfpre3  38977  presucmap  38994
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