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Theorem dfpre2 38815
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 38814 . 2 pre 𝑁 = (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁))
2 elpredg 6274 . . . 4 ((𝑁𝑉𝑚 ∈ V) → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁))
32elvd 3436 . . 3 (𝑁𝑉 → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁))
43iotabidv 6477 . 2 (𝑁𝑉 → (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁)) = (℩𝑚𝑚 SucMap 𝑁))
51, 4eqtrid 2784 1 (𝑁𝑉 → pre 𝑁 = (℩𝑚𝑚 SucMap 𝑁))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206   = wceq 1542  wcel 2114  Vcvv 3430   class class class wbr 5086  Predcpred 6259  cio 6447   SucMap csucmap 38516   pre cpre 38518
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-ext 2709  ax-sep 5232  ax-pr 5371  ax-un 7683
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-clab 2716  df-cleq 2729  df-clel 2812  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-br 5087  df-opab 5149  df-xp 5631  df-cnv 5633  df-dm 5635  df-rn 5636  df-res 5637  df-ima 5638  df-pred 6260  df-suc 6324  df-iota 6449  df-sucmap 38800  df-pre 38813
This theorem is referenced by:  dfpre3  38816  presucmap  38833
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