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Theorem eupre 38861
Description: Unique predecessor exists on the successor class. (Contributed by Peter Mazsa, 27-Jan-2026.)
Assertion
Ref Expression
eupre (𝑁𝑉 → (𝑁 ∈ Suc ↔ ∃!𝑚 𝑚 SucMap 𝑁))
Distinct variable groups:   𝑚,𝑁   𝑚,𝑉

Proof of Theorem eupre
StepHypRef Expression
1 df-succl 38836 . . 3 Suc = ran SucMap
21eleq2i 2831 . 2 (𝑁 ∈ Suc ↔ 𝑁 ∈ ran SucMap )
3 eupre2 38860 . 2 (𝑁𝑉 → (𝑁 ∈ ran SucMap ↔ ∃!𝑚 𝑚 SucMap 𝑁))
42, 3bitrid 284 1 (𝑁𝑉 → (𝑁 ∈ Suc ↔ ∃!𝑚 𝑚 SucMap 𝑁))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207  wcel 2119  ∃!weu 2572   class class class wbr 5072  ran crn 5619   SucMap csucmap 38545   Suc csuccl 38546
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  ax-reg 9497
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-mo 2543  df-eu 2573  df-clab 2718  df-cleq 2731  df-clel 2814  df-ne 2935  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-pw 4531  df-sn 4556  df-pr 4558  df-op 4562  df-uni 4839  df-br 5073  df-opab 5135  df-eprel 5518  df-fr 5571  df-cnv 5626  df-dm 5628  df-rn 5629  df-suc 6316  df-sucmap 38829  df-succl 38836
This theorem is referenced by: (None)
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