![]() |
Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
|
Mirrors > Home > MPE Home > Th. List > peano2 | Structured version Visualization version GIF version |
Description: The successor of any natural number is a natural number. One of Peano's five postulates for arithmetic. Proposition 7.30(2) of [TakeutiZaring] p. 42. (Contributed by NM, 3-Sep-2003.) |
Ref | Expression |
---|---|
peano2 | ⊢ (𝐴 ∈ ω → suc 𝐴 ∈ ω) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | peano2b 7576 | . 2 ⊢ (𝐴 ∈ ω ↔ suc 𝐴 ∈ ω) | |
2 | 1 | biimpi 219 | 1 ⊢ (𝐴 ∈ ω → suc 𝐴 ∈ ω) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2111 suc csuc 6161 ωcom 7560 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 ax-un 7441 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-rab 3115 df-v 3443 df-sbc 3721 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-tr 5137 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-we 5480 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-om 7561 |
This theorem is referenced by: onnseq 7964 seqomlem1 8069 seqomlem4 8072 onasuc 8136 onmsuc 8137 onesuc 8138 o2p2e4 8149 nnacl 8220 nnecl 8222 nnacom 8226 nnmsucr 8234 1onn 8248 2onn 8249 3onn 8250 4onn 8251 nnneo 8261 nneob 8262 omopthlem1 8265 onomeneq 8693 dif1en 8735 findcard 8741 findcard2 8742 unbnn2 8759 dffi3 8879 wofib 8993 axinf2 9087 dfom3 9094 noinfep 9107 cantnflt 9119 trcl 9154 cardsucnn 9398 harsucnn 9411 dif1card 9421 fseqdom 9437 alephfp 9519 ackbij1lem5 9635 ackbij1lem16 9646 ackbij2lem2 9651 ackbij2lem3 9652 ackbij2 9654 sornom 9688 infpssrlem4 9717 fin23lem26 9736 fin23lem20 9748 fin23lem38 9760 fin23lem39 9761 isf32lem2 9765 isf32lem3 9766 isf34lem7 9790 isf34lem6 9791 fin1a2lem6 9816 fin1a2lem9 9819 fin1a2lem12 9822 domtriomlem 9853 axdc2lem 9859 axdc3lem 9861 axdc3lem2 9862 axdc3lem4 9864 axdc4lem 9866 axdclem2 9931 peano2nn 11637 om2uzrani 13315 uzrdgsuci 13323 fzennn 13331 axdc4uzlem 13346 bnj970 32329 satfvsuc 32721 satfvsucsuc 32725 gonarlem 32754 goalrlem 32756 satffunlem2lem2 32766 satffunlem2 32768 ex-sategoelelomsuc 32786 trpredtr 33182 elhf2 33749 0hf 33751 hfsn 33753 hfpw 33759 neibastop2lem 33821 exrecfnlem 34796 finxpsuclem 34814 domalom 34821 |
Copyright terms: Public domain | W3C validator |