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| Mirrors > Home > MPE Home > Th. List > 3nn | Structured version Visualization version GIF version | ||
| Description: 3 is a positive integer. (Contributed by NM, 8-Jan-2006.) |
| Ref | Expression |
|---|---|
| 3nn | ⊢ 3 ∈ ℕ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-3 12328 | . 2 ⊢ 3 = (2 + 1) | |
| 2 | 2nn 12338 | . . 3 ⊢ 2 ∈ ℕ | |
| 3 | peano2nn 12269 | . . 3 ⊢ (2 ∈ ℕ → (2 + 1) ∈ ℕ) | |
| 4 | 2, 3 | ax-mp 5 | . 2 ⊢ (2 + 1) ∈ ℕ |
| 5 | 1, 4 | eqeltri 2856 | 1 ⊢ 3 ∈ ℕ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 (class class class)co 7413 1c1 11125 + caddc 11127 ℕcn 12257 2c2 12319 3c3 12320 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pr 5398 ax-un 7736 ax-1cn 11182 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-ov 7416 df-om 7863 df-2nd 7987 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-nn 12258 df-2 12327 df-3 12328 |
| This theorem is used by: 4nn 12348 3pos 12373 3ne0 12374 3nn0 12546 3z 12651 ige3m2fz 13603 fvf1tp 13850 tpf1ofv0 14561 tpf1ofv1 14562 tpf1ofv2 14563 tpfo 14565 f1oun2prg 14988 01sqrexlem7 15335 bpoly4 16145 fsumcube 16146 sin01bnd 16273 egt2lt3 16294 rpnnen2lem2 16303 rpnnen2lem3 16304 rpnnen2lem4 16305 rpnnen2lem9 16310 rpnnen2lem11 16312 5ndvds3 16503 3lcm2e6woprm 16705 3lcm2e6 16823 prmo3 17133 5prm 17200 6nprm 17201 7prm 17202 9nprm 17204 11prm 17207 13prm 17208 17prm 17209 19prm 17210 23prm 17211 prmlem2 17212 37prm 17213 43prm 17214 83prm 17215 139prm 17216 163prm 17217 317prm 17218 631prm 17219 1259lem5 17227 2503lem1 17229 2503lem2 17230 2503lem3 17231 4001lem4 17236 4001prm 17237 mulrndx 17379 mulridx 17380 rngstr 17383 unifndx 17480 unifid 17481 unifndxnn 17482 slotsdifunifndx 17486 lt6abl 20022 cnfldstr 21587 tangtx 26743 1cubrlem 27078 1cubr 27079 dcubic1lem 27080 dcubic2 27081 dcubic 27083 mcubic 27084 cubic2 27085 cubic 27086 quartlem3 27096 quart 27098 log2cnv 27181 log2tlbnd 27182 log2ublem1 27183 log2ublem2 27184 log2ub 27186 ppiublem1 27438 ppiub 27440 chtub 27448 bposlem3 27522 bposlem4 27523 bposlem5 27524 bposlem6 27525 bposlem9 27528 lgsdir2lem5 27565 dchrvmasumlem2 27734 dchrvmasumlema 27736 pntleml 27847 tgcgr4 28873 axlowdimlem16 29414 axlowdimlem17 29415 usgrexmpldifpr 29718 upgr3v3e3cycl 30660 ex-cnv 30917 ex-rn 30920 ex-mod 30929 2sqr3minply 34290 cos9thpiminplylem1 34292 cos9thpiminplylem2 34293 cos9thpiminplylem5 34296 fib4 34915 circlevma 35150 circlemethhgt 35151 hgt750lema 35165 sinccvglem 36251 cnndvlem1 37234 mblfinlem3 38408 itg2addnclem2 38421 itg2addnc 38423 lcm3un 42881 aks4d1p1 42942 3cubeslem2 43530 3cubeslem3r 43532 3cubes 43535 rmydioph 43855 rmxdioph 43857 expdiophlem2 43863 expdioph 43864 amgm3d 45039 lhe4.4ex1a 45153 modm2nep1 48260 modm1nep2 48262 257prm 48464 fmtno4prmfac193 48476 fmtno4nprmfac193 48477 3ndvds4 48498 139prmALT 48499 31prm 48500 127prm 48502 41prothprm 48522 341fppr2 48650 nfermltl2rev 48659 wtgoldbnnsum4prm 48718 bgoldbnnsum3prm 48720 bgoldbtbndlem1 48721 tgoldbach 48733 grtriclwlk3 48861 gpg3kgrtriexlem2 49000 gpg3kgrtriexlem5 49003 gpg3kgrtriexlem6 49004 gpg3kgrtriex 49005 1elfz13 50776 2elfz13 50777 3elfz13 50778 veronesevrowd 50812 veroquadgsumlem 50816 |
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