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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 38727 | . 2 ⊢ pre 𝑁 = (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁)) | |
| 2 | elpredg 6281 | . . . 4 ⊢ ((𝑁 ∈ 𝑉 ∧ 𝑚 ∈ V) → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁)) | |
| 3 | 2 | elvd 3448 | . . 3 ⊢ (𝑁 ∈ 𝑉 → (𝑚 ∈ Pred( SucMap , V, 𝑁) ↔ 𝑚 SucMap 𝑁)) |
| 4 | 3 | iotabidv 6484 | . 2 ⊢ (𝑁 ∈ 𝑉 → (℩𝑚𝑚 ∈ Pred( SucMap , V, 𝑁)) = (℩𝑚𝑚 SucMap 𝑁)) |
| 5 | 1, 4 | eqtrid 2784 | 1 ⊢ (𝑁 ∈ 𝑉 → pre 𝑁 = (℩𝑚𝑚 SucMap 𝑁)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 = wceq 1542 ∈ wcel 2114 Vcvv 3442 class class class wbr 5100 Predcpred 6266 ℩cio 6454 SucMap csucmap 38429 pre cpre 38431 |
| 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 5243 ax-pr 5379 ax-un 7690 |
| 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-clab 2716 df-cleq 2729 df-clel 2812 df-ral 3053 df-rex 3063 df-rab 3402 df-v 3444 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-xp 5638 df-cnv 5640 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-suc 6331 df-iota 6456 df-sucmap 38713 df-pre 38726 |
| This theorem is referenced by: dfpre3 38729 presucmap 38746 |
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