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| Mirrors > Home > MPE Home > Th. List > Mathboxes > dfpre2 | Structured version Visualization version GIF version | ||
| Description: Alternate definition of the successor-predecessor. (Contributed by Peter Mazsa, 12-Jan-2026.) |
| Ref | Expression |
|---|---|
| dfpre2 | ⊢ (𝑁 ∈ 𝑉 → pre 𝑁 = (℩𝑚𝑚 SucMap 𝑁)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dfpre 39014 | . 2 ⊢ pre 𝑁 = (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁)) | |
| 2 | elpredg 6317 | . . . 4 ⊢ ((𝑁 ∈ 𝑉 ∧ 𝑚 ∈ V) → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁)) | |
| 3 | 2 | elvd 3469 | . . 3 ⊢ (𝑁 ∈ 𝑉 → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁)) |
| 4 | 3 | iotabidv 6521 | . 2 ⊢ (𝑁 ∈ 𝑉 → (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁)) = (℩𝑚𝑚 SucMap 𝑁)) |
| 5 | 1, 4 | eqtrid 2816 | 1 ⊢ (𝑁 ∈ 𝑉 → pre 𝑁 = (℩𝑚𝑚 SucMap 𝑁)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 209 = wceq 1567 ∈ wcel 2149 Vcvv 3463 class class class wbr 5113 Predcpred 6302 ℩cio 6491 SucMap csucmap 38716 pre cpre 38718 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 ax-sep 5261 ax-pr 5405 ax-un 7733 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-sb 2098 df-clab 2748 df-cleq 2761 df-clel 2844 df-ral 3086 df-rex 3096 df-rab 3424 df-v 3465 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-br 5114 df-opab 5178 df-xp 5668 df-cnv 5670 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-pred 6303 df-suc 6367 df-iota 6493 df-sucmap 39000 df-pre 39013 |
| This theorem is referenced by: dfpre3 39016 presucmap 39033 |
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