| 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 38665 | . . 3 ⊢ pre 𝑁 ∈ V | |
| 2 | 1 | sucid 6401 | . 2 ⊢ pre 𝑁 ∈ suc pre 𝑁 |
| 3 | sucpre 38670 | . 2 ⊢ (𝑁 ∈ Suc → suc pre 𝑁 = 𝑁) | |
| 4 | 2, 3 | eleqtrid 2842 | 1 ⊢ (𝑁 ∈ Suc → pre 𝑁 ∈ 𝑁) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2113 suc csuc 6319 Suc csuccl 38379 pre cpre 38380 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pr 5377 ax-un 7680 ax-reg 9497 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-rab 3400 df-v 3442 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-opab 5161 df-eprel 5524 df-fr 5577 df-xp 5630 df-cnv 5632 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-suc 6323 df-iota 6448 df-sucmap 38636 df-succl 38643 df-pre 38649 |
| This theorem is referenced by: (None) |
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