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| Mirrors > Home > MPE Home > Th. List > Mathboxes > eupre2 | Structured version Visualization version GIF version | ||
| Description: Unique predecessor exists on the range of the successor map. (Contributed by Peter Mazsa, 12-Jan-2026.) |
| Ref | Expression |
|---|---|
| eupre2 | ⊢ (𝑁 ∈ 𝑉 → (𝑁 ∈ ran SucMap ↔ ∃!𝑚 𝑚 SucMap 𝑁)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elrng 5841 | . 2 ⊢ (𝑁 ∈ 𝑉 → (𝑁 ∈ ran SucMap ↔ ∃𝑚 𝑚 SucMap 𝑁)) | |
| 2 | exeupre 38829 | . 2 ⊢ (𝑁 ∈ 𝑉 → (∃𝑚 𝑚 SucMap 𝑁 ↔ ∃!𝑚 𝑚 SucMap 𝑁)) | |
| 3 | 1, 2 | bitrd 279 | 1 ⊢ (𝑁 ∈ 𝑉 → (𝑁 ∈ ran SucMap ↔ ∃!𝑚 𝑚 SucMap 𝑁)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∃wex 1781 ∈ wcel 2114 ∃!weu 2569 class class class wbr 5086 ran crn 5626 SucMap csucmap 38516 |
| 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 ax-reg 9501 |
| 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 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 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-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-eprel 5525 df-fr 5578 df-cnv 5633 df-dm 5635 df-rn 5636 df-suc 6324 df-sucmap 38800 |
| This theorem is referenced by: eupre 38832 presucmap 38833 |
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