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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 7877 | . 2 ⊢ Lim ω | |
| 2 | limsuc 7844 | . 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 2108 Lim wlim 6353 suc csuc 6354 ωcom 7861 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-ext 2707 ax-sep 5266 ax-nul 5276 ax-pr 5402 ax-un 7729 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-sb 2065 df-clab 2714 df-cleq 2727 df-clel 2809 df-ne 2933 df-ral 3052 df-rex 3061 df-rab 3416 df-v 3461 df-dif 3929 df-un 3931 df-in 3933 df-ss 3943 df-pss 3946 df-nul 4309 df-if 4501 df-pw 4577 df-sn 4602 df-pr 4604 df-op 4608 df-uni 4884 df-br 5120 df-opab 5182 df-tr 5230 df-eprel 5553 df-po 5561 df-so 5562 df-fr 5606 df-we 5608 df-ord 6355 df-on 6356 df-lim 6357 df-suc 6358 df-om 7862 |
| This theorem is referenced by: nnsuc 7879 peano2 7886 peano5 7889 frsuc 8451 frsucmptn 8453 nnaordi 8630 nnmsucr 8637 omsmolem 8669 php 9221 php4 9224 phpOLD 9231 unblem1 9300 isfinite2 9306 inf0 9635 inf3lem1 9642 inf3lem5 9646 cantnfp1lem3 9694 cantnflem1 9703 itunisuc 10433 ituniiun 10436 indpi 10921 constrllcllem 33786 constrlccllem 33787 constrcccllem 33788 rdgeqoa 37388 |
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