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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 7822 | . 2 ⊢ Lim ω | |
| 2 | limsuc 7789 | . 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 207 ∈ wcel 2119 Lim wlim 6311 suc csuc 6312 ωcom 7806 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2711 ax-sep 5218 ax-nul 5228 ax-pr 5362 ax-un 7678 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-clab 2718 df-cleq 2731 df-clel 2814 df-ne 2935 df-ral 3054 df-rex 3064 df-rab 3392 df-v 3433 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3903 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-br 5073 df-opab 5135 df-tr 5180 df-eprel 5518 df-po 5526 df-so 5527 df-fr 5571 df-we 5573 df-ord 6313 df-on 6314 df-lim 6315 df-suc 6316 df-om 7807 |
| This theorem is referenced by: nnsuc 7824 peano2 7830 peano5 7833 frsuc 8366 frsucmptn 8368 nnaordi 8544 nnmsucr 8551 omsmolem 8583 php 9131 php4 9134 unblem1 9192 isfinite2 9198 inf0 9533 inf3lem1 9540 inf3lem5 9544 cantnfp1lem3 9592 cantnflem1 9601 itunisuc 10332 ituniiun 10335 indpi 10821 constrllcllem 33936 constrlccllem 33937 constrcccllem 33938 rdgeqoa 37732 |
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