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| Mirrors > Home > MPE Home > Th. List > peano2b | Structured version Visualization version GIF version | ||
| Description: A class belongs to omega iff its successor does. (Contributed by NM, 3-Dec-1995.) |
| Ref | Expression |
|---|---|
| peano2b | ⊢ (𝐴 ∈ ω ↔ suc 𝐴 ∈ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | limom 7807 | . 2 ⊢ Lim ω | |
| 2 | limsuc 7774 | . 2 ⊢ (Lim ω → (𝐴 ∈ ω ↔ suc 𝐴 ∈ ω)) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐴 ∈ ω ↔ suc 𝐴 ∈ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∈ wcel 2111 Lim wlim 6302 suc csuc 6303 ωcom 7791 |
| 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 2113 ax-9 2121 ax-ext 2703 ax-sep 5229 ax-nul 5239 ax-pr 5365 ax-un 7663 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2710 df-cleq 2723 df-clel 2806 df-ne 2929 df-ral 3048 df-rex 3057 df-rab 3396 df-v 3438 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-pss 3917 df-nul 4279 df-if 4471 df-pw 4547 df-sn 4572 df-pr 4574 df-op 4578 df-uni 4855 df-br 5087 df-opab 5149 df-tr 5194 df-eprel 5511 df-po 5519 df-so 5520 df-fr 5564 df-we 5566 df-ord 6304 df-on 6305 df-lim 6306 df-suc 6307 df-om 7792 |
| This theorem is referenced by: nnsuc 7809 peano2 7815 peano5 7818 frsuc 8351 frsucmptn 8353 nnaordi 8528 nnmsucr 8535 omsmolem 8567 php 9111 php4 9114 unblem1 9171 isfinite2 9177 inf0 9506 inf3lem1 9513 inf3lem5 9517 cantnfp1lem3 9565 cantnflem1 9574 itunisuc 10305 ituniiun 10308 indpi 10793 constrllcllem 33757 constrlccllem 33758 constrcccllem 33759 rdgeqoa 37404 |
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