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Related theorems GIF version |
| Description: A class belongs to omega iff its successor does. |
| Ref | Expression |
|---|---|
| peano2b | ⊢ (A ∈ ω ↔ suc A ∈ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | limom 2387 | . 2 ⊢ Lim ω | |
| 2 | limsuc 2361 | . 2 ⊢ (Lim ω → (A ∈ ω ↔ suc A ∈ ω)) | |
| 3 | 1, 2 | ax-mp 6 | 1 ⊢ (A ∈ ω ↔ suc A ∈ ω) |
| Colors of variables: wff set class |
| Syntax hints: ↔ wb 127 ∈ wcel 1092 Lim wlim 2200 suc csuc 2201 ωcom 2372 |
| This theorem is referenced by: nnsuc 2389 peano2 2391 peano5 2394 frsuc 2991 nnacom 3175 nnmsucr 3182 nnmordi 3188 omsmolem 3195 php 3409 php4 3412 omsucdom 3418 unblem1 3431 isfinite2 3437 inf0 3457 inf3lem1 3464 inf3lem5 3468 sucdom 3648 indpi 3828 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-un 1076 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-3or 582 df-3an 583 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-ral 1205 df-rex 1206 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-if 1777 df-pw 1799 df-sn 1811 df-pr 1812 df-tp 1814 df-op 1815 df-uni 1920 df-tr 2042 df-br 2063 df-opab 2098 df-eprel 2122 df-po 2128 df-so 2138 df-fr 2169 df-we 2186 df-ord 2202 df-on 2203 df-lim 2204 df-suc 2205 df-om 2373 |