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Theorem dfpre2 38844
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 38843 . 2 pre 𝑁 = (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁))
2 elpredg 6266 . . . 4 ((𝑁𝑉𝑚 ∈ V) → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁))
32elvd 3437 . . 3 (𝑁𝑉 → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁))
43iotabidv 6469 . 2 (𝑁𝑉 → (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁)) = (℩𝑚𝑚 SucMap 𝑁))
51, 4eqtrid 2786 1 (𝑁𝑉 → pre 𝑁 = (℩𝑚𝑚 SucMap 𝑁))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207   = wceq 1547  wcel 2119  Vcvv 3431   class class class wbr 5072  Predcpred 6251  cio 6439   SucMap csucmap 38545   pre cpre 38547
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-ext 2711  ax-sep 5218  ax-pr 5362  ax-un 7678
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-clab 2718  df-cleq 2731  df-clel 2814  df-ral 3054  df-rex 3064  df-rab 3392  df-v 3433  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4262  df-if 4455  df-sn 4556  df-pr 4558  df-op 4562  df-uni 4839  df-br 5073  df-opab 5135  df-xp 5624  df-cnv 5626  df-dm 5628  df-rn 5629  df-res 5630  df-ima 5631  df-pred 6252  df-suc 6316  df-iota 6441  df-sucmap 38829  df-pre 38842
This theorem is referenced by:  dfpre3  38845  presucmap  38862
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