| Mathbox for Peter Mazsa |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > preel | Structured version Visualization version GIF version | ||
| Description: Predecessor is a subset of its successor. (Contributed by Peter Mazsa, 12-Jan-2026.) |
| Ref | Expression |
|---|---|
| preel | ⊢ (𝑁 ∈ Suc → pre 𝑁 ∈ 𝑁) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | preex 39561 | . . 3 ⊢ pre 𝑁 ∈ V | |
| 2 | 1 | sucid 6450 | . 2 ⊢ pre 𝑁 ∈ suc pre 𝑁 |
| 3 | sucpre 39566 | . 2 ⊢ (𝑁 ∈ Suc → suc pre 𝑁 = 𝑁) | |
| 4 | 2, 3 | eleqtrid 2866 | 1 ⊢ (𝑁 ∈ Suc → pre 𝑁 ∈ 𝑁) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2144 suc csuc 6367 Suc csuccl 39248 pre cpre 39249 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5391 ax-un 7755 ax-reg 9593 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3897 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-eprel 5551 df-fr 5604 df-xp 5657 df-cnv 5659 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6307 df-suc 6371 df-iota 6497 df-sucmap 39531 df-succl 39538 df-pre 39544 |
| This theorem is used by: (None) |
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