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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 38843 | . 2 ⊢ pre 𝑁 = (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁)) | |
| 2 | elpredg 6266 | . . . 4 ⊢ ((𝑁 ∈ 𝑉 ∧ 𝑚 ∈ V) → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁)) | |
| 3 | 2 | elvd 3437 | . . 3 ⊢ (𝑁 ∈ 𝑉 → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁)) |
| 4 | 3 | iotabidv 6469 | . 2 ⊢ (𝑁 ∈ 𝑉 → (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁)) = (℩𝑚𝑚 SucMap 𝑁)) |
| 5 | 1, 4 | eqtrid 2786 | 1 ⊢ (𝑁 ∈ 𝑉 → pre 𝑁 = (℩𝑚𝑚 SucMap 𝑁)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 207 = wceq 1547 ∈ wcel 2119 Vcvv 3431 class class class wbr 5072 Predcpred 6251 ℩cio 6439 SucMap csucmap 38545 pre cpre 38547 |
| 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 |
| 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-clab 2718 df-cleq 2731 df-clel 2814 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-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-br 5073 df-opab 5135 df-xp 5624 df-cnv 5626 df-dm 5628 df-rn 5629 df-res 5630 df-ima 5631 df-pred 6252 df-suc 6316 df-iota 6441 df-sucmap 38829 df-pre 38842 |
| This theorem is referenced by: dfpre3 38845 presucmap 38862 |
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