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Theorem eupre2 38814
Description: Unique predecessor exists on the range of the successor map. (Contributed by Peter Mazsa, 12-Jan-2026.)
Assertion
Ref Expression
eupre2 (𝑁𝑉 → (𝑁 ∈ ran SucMap ↔ ∃!𝑚 𝑚 SucMap 𝑁))
Distinct variable groups:   𝑚,𝑁   𝑚,𝑉

Proof of Theorem eupre2
StepHypRef Expression
1 elrng 5846 . 2 (𝑁𝑉 → (𝑁 ∈ ran SucMap ↔ ∃𝑚 𝑚 SucMap 𝑁))
2 exeupre 38812 . 2 (𝑁𝑉 → (∃𝑚 𝑚 SucMap 𝑁 ↔ ∃!𝑚 𝑚 SucMap 𝑁))
31, 2bitrd 279 1 (𝑁𝑉 → (𝑁 ∈ ran SucMap ↔ ∃!𝑚 𝑚 SucMap 𝑁))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wex 1781  wcel 2114  ∃!weu 2568   class class class wbr 5085  ran crn 5632   SucMap csucmap 38499
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 2708  ax-sep 5231  ax-pr 5375  ax-un 7689  ax-reg 9507
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-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-ne 2933  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-eprel 5531  df-fr 5584  df-cnv 5639  df-dm 5641  df-rn 5642  df-suc 6329  df-sucmap 38783
This theorem is referenced by:  eupre  38815  presucmap  38816
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