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| Mirrors > Home > MPE Home > Th. List > Mathboxes > eupre | Structured version Visualization version GIF version | ||
| Description: Unique predecessor exists on the successor class. (Contributed by Peter Mazsa, 27-Jan-2026.) |
| Ref | Expression |
|---|---|
| eupre | ⊢ (𝑁 ∈ 𝑉 → (𝑁 ∈ Suc ↔ ∃!𝑚 𝑚 SucMap 𝑁)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-succl 38836 | . . 3 ⊢ Suc = ran SucMap | |
| 2 | 1 | eleq2i 2831 | . 2 ⊢ (𝑁 ∈ Suc ↔ 𝑁 ∈ ran SucMap ) |
| 3 | eupre2 38860 | . 2 ⊢ (𝑁 ∈ 𝑉 → (𝑁 ∈ ran SucMap ↔ ∃!𝑚 𝑚 SucMap 𝑁)) | |
| 4 | 2, 3 | bitrid 284 | 1 ⊢ (𝑁 ∈ 𝑉 → (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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