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Mirrors > Home > MPE Home > Th. List > 8nn | Structured version Visualization version GIF version |
Description: 8 is a positive integer. (Contributed by Mario Carneiro, 15-Sep-2013.) |
Ref | Expression |
---|---|
8nn | ⊢ 8 ∈ ℕ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-8 11694 | . 2 ⊢ 8 = (7 + 1) | |
2 | 7nn 11717 | . . 3 ⊢ 7 ∈ ℕ | |
3 | peano2nn 11637 | . . 3 ⊢ (7 ∈ ℕ → (7 + 1) ∈ ℕ) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ (7 + 1) ∈ ℕ |
5 | 1, 4 | eqeltri 2886 | 1 ⊢ 8 ∈ ℕ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2111 (class class class)co 7135 1c1 10527 + caddc 10529 ℕcn 11625 7c7 11685 8c8 11686 |
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 df-5 11691 df-6 11692 df-7 11693 df-8 11694 |
This theorem is referenced by: 9nn 11723 8nn0 11908 37prm 16446 43prm 16447 83prm 16448 317prm 16451 1259lem4 16459 1259lem5 16460 2503prm 16465 4001prm 16470 ipndx 16633 ipid 16634 ipsstr 16635 ressip 16644 phlstr 16645 tngip 23253 quart1cl 25440 quart1lem 25441 quart1 25442 log2tlbnd 25531 bposlem8 25875 lgsdir2lem2 25910 lgsdir2lem3 25911 2lgslem3a1 25984 2lgslem3b1 25985 2lgslem3c1 25986 2lgslem3d1 25987 2lgslem4 25990 2lgsoddprmlem2 25993 pntlemr 26186 pntlemj 26187 edgfid 26784 edgfndxnn 26785 edgfndxid 26786 baseltedgf 26787 ex-prmo 28244 hgt750lem 32032 hgt750lem2 32033 420gcd8e4 39294 420lcm8e840 39299 lcm8un 39308 lcmineqlem23 39339 lcmineqlem 39340 3lexlogpow5ineq2 39342 rmydioph 39955 fmtnoprmfac2lem1 44083 127prm 44116 mod42tp1mod8 44120 8even 44231 8exp8mod9 44254 9fppr8 44255 nfermltl8rev 44260 nfermltlrev 44262 nnsum4primesevenALTV 44319 wtgoldbnnsum4prm 44320 bgoldbnnsum3prm 44322 bgoldbtbndlem1 44323 tgblthelfgott 44333 tgoldbachlt 44334 |
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