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Mirrors > Home > ILE Home > Th. List > peano1 | Unicode version |
Description: Zero is a natural number. One of Peano's five postulates for arithmetic. Proposition 7.30(1) of [TakeutiZaring] p. 42. (Contributed by NM, 15-May-1994.) |
Ref | Expression |
---|---|
peano1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0ex 4055 | . . . 4 | |
2 | 1 | elint 3777 | . . 3 |
3 | df-clab 2126 | . . . 4 | |
4 | simpl 108 | . . . . . 6 | |
5 | 4 | sbimi 1737 | . . . . 5 |
6 | clelsb4 2245 | . . . . 5 | |
7 | 5, 6 | sylib 121 | . . . 4 |
8 | 3, 7 | sylbi 120 | . . 3 |
9 | 2, 8 | mpgbir 1429 | . 2 |
10 | dfom3 4506 | . 2 | |
11 | 9, 10 | eleqtrri 2215 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wcel 1480 wsb 1735 cab 2125 wral 2416 c0 3363 cint 3771 csuc 4287 com 4504 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-nul 4054 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-v 2688 df-dif 3073 df-nul 3364 df-int 3772 df-iom 4505 |
This theorem is referenced by: peano5 4512 limom 4527 nnregexmid 4534 omsinds 4535 nnpredcl 4536 frec0g 6294 frecabcl 6296 frecrdg 6305 oa1suc 6363 nna0r 6374 nnm0r 6375 nnmcl 6377 nnmsucr 6384 1onn 6416 nnm1 6420 nnaordex 6423 nnawordex 6424 php5 6752 php5dom 6757 0fin 6778 findcard2 6783 findcard2s 6784 infm 6798 inffiexmid 6800 0ct 6992 ctmlemr 6993 ctssdclemn0 6995 ctssdc 6998 omct 7002 fodjum 7018 fodju0 7019 ctssexmid 7024 1lt2pi 7148 nq0m0r 7264 nq0a0 7265 prarloclem5 7308 frec2uzrand 10178 frecuzrdg0 10186 frecuzrdg0t 10195 frecfzennn 10199 0tonninf 10212 1tonninf 10213 hashinfom 10524 hashunlem 10550 hash1 10557 ennnfonelemj0 11914 ennnfonelem1 11920 ennnfonelemhf1o 11926 ennnfonelemhom 11928 bj-nn0suc 13162 bj-nn0sucALT 13176 pwle2 13193 pwf1oexmid 13194 subctctexmid 13196 peano3nninf 13201 nninfall 13204 nninfsellemdc 13206 nninfsellemeq 13210 nninffeq 13216 isomninnlem 13225 |
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