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Mirrors > Home > MPE Home > Th. List > 4nn | Structured version Visualization version GIF version |
Description: 4 is a positive integer. (Contributed by NM, 8-Jan-2006.) |
Ref | Expression |
---|---|
4nn | ⊢ 4 ∈ ℕ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-4 11690 | . 2 ⊢ 4 = (3 + 1) | |
2 | 3nn 11704 | . . 3 ⊢ 3 ∈ ℕ | |
3 | peano2nn 11637 | . . 3 ⊢ (3 ∈ ℕ → (3 + 1) ∈ ℕ) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ (3 + 1) ∈ ℕ |
5 | 1, 4 | eqeltri 2886 | 1 ⊢ 4 ∈ ℕ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2111 (class class class)co 7135 1c1 10527 + caddc 10529 ℕcn 11625 3c3 11681 4c4 11682 |
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-pow 5231 ax-pr 5295 ax-un 7441 ax-1cn 10584 |
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-reu 3113 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 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-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-pred 6116 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-ov 7138 df-om 7561 df-wrecs 7930 df-recs 7991 df-rdg 8029 df-nn 11626 df-2 11688 df-3 11689 df-4 11690 |
This theorem is referenced by: 5nn 11711 4nn0 11904 4z 12004 fldiv4p1lem1div2 13200 fldiv4lem1div2 13202 iexpcyc 13565 fsumcube 15406 ef01bndlem 15529 flodddiv4 15754 6lcm4e12 15950 2expltfac 16418 8nprm 16437 37prm 16446 43prm 16447 83prm 16448 139prm 16449 631prm 16452 prmo4 16453 1259prm 16461 2503lem2 16463 starvndx 16615 starvid 16616 ressstarv 16618 srngstr 16619 homndx 16679 homid 16680 resshom 16683 prdsvalstr 16718 oppchomfval 16976 oppcbas 16980 rescco 17094 catstr 17219 lt6abl 19008 pcoass 23629 minveclem3 24033 iblitg 24372 dveflem 24582 tan4thpi 25107 atan1 25514 log2tlbnd 25531 log2ub 25535 bclbnd 25864 bpos1 25867 bposlem6 25873 bposlem7 25874 bposlem8 25875 bposlem9 25876 gausslemma2dlem4 25953 m1lgs 25972 2lgslem1a 25975 2lgslem3a 25980 2lgslem3b 25981 2lgslem3c 25982 2lgslem3d 25983 2sqreultlem 26031 2sqreunnltlem 26034 chebbnd1lem1 26053 chebbnd1lem2 26054 chebbnd1lem3 26055 pntibndlem1 26173 pntibndlem2 26175 pntibndlem3 26176 pntlema 26180 pntlemb 26181 pntlemg 26182 pntlemf 26189 upgr4cycl4dv4e 27970 fib5 31773 hgt750lem2 32033 hgt750leme 32039 iccioo01 34741 420gcd8e4 39294 420lcm8e840 39299 lcm4un 39304 lcmineqlem23 39339 lcmineqlem 39340 3lexlogpow5ineq1 39341 rmydioph 39955 rmxdioph 39957 expdiophlem2 39963 inductionexd 40858 amgm4d 40906 257prm 44078 fmtno4sqrt 44088 fmtno4prmfac 44089 fmtno4prmfac193 44090 fmtno5nprm 44100 139prmALT 44113 mod42tp1mod8 44120 2exp340mod341 44251 341fppr2 44252 wtgoldbnnsum4prm 44320 bgoldbachlt 44331 tgblthelfgott 44333 |
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