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Theorem dfpre2 39015
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 39014 . 2 pre 𝑁 = (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁))
2 elpredg 6317 . . . 4 ((𝑁𝑉𝑚 ∈ V) → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁))
32elvd 3469 . . 3 (𝑁𝑉 → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁))
43iotabidv 6521 . 2 (𝑁𝑉 → (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁)) = (℩𝑚𝑚 SucMap 𝑁))
51, 4eqtrid 2816 1 (𝑁𝑉 → pre 𝑁 = (℩𝑚𝑚 SucMap 𝑁))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209   = wceq 1567  wcel 2149  Vcvv 3463   class class class wbr 5113  Predcpred 6302  cio 6491   SucMap csucmap 38716   pre cpre 38718
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-ext 2741  ax-sep 5261  ax-pr 5405  ax-un 7733
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-sb 2098  df-clab 2748  df-cleq 2761  df-clel 2844  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-br 5114  df-opab 5178  df-xp 5668  df-cnv 5670  df-dm 5672  df-rn 5673  df-res 5674  df-ima 5675  df-pred 6303  df-suc 6367  df-iota 6493  df-sucmap 39000  df-pre 39013
This theorem is referenced by:  dfpre3  39016  presucmap  39033
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