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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 11688 | . 2 ⊢ 8 = (7 + 1) | |
2 | 7nn 11711 | . . 3 ⊢ 7 ∈ ℕ | |
3 | peano2nn 11631 | . . 3 ⊢ (7 ∈ ℕ → (7 + 1) ∈ ℕ) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ (7 + 1) ∈ ℕ |
5 | 1, 4 | eqeltri 2907 | 1 ⊢ 8 ∈ ℕ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2114 (class class class)co 7137 1c1 10519 + caddc 10521 ℕcn 11619 7c7 11679 8c8 11680 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2792 ax-sep 5184 ax-nul 5191 ax-pow 5247 ax-pr 5311 ax-un 7442 ax-1cn 10576 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2653 df-clab 2799 df-cleq 2813 df-clel 2891 df-nfc 2959 df-ne 3012 df-ral 3138 df-rex 3139 df-reu 3140 df-rab 3142 df-v 3483 df-sbc 3759 df-csb 3867 df-dif 3922 df-un 3924 df-in 3926 df-ss 3935 df-pss 3937 df-nul 4275 df-if 4449 df-pw 4522 df-sn 4549 df-pr 4551 df-tp 4553 df-op 4555 df-uni 4820 df-iun 4902 df-br 5048 df-opab 5110 df-mpt 5128 df-tr 5154 df-id 5441 df-eprel 5446 df-po 5455 df-so 5456 df-fr 5495 df-we 5497 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-res 5548 df-ima 5549 df-pred 6129 df-ord 6175 df-on 6176 df-lim 6177 df-suc 6178 df-iota 6295 df-fun 6338 df-fn 6339 df-f 6340 df-f1 6341 df-fo 6342 df-f1o 6343 df-fv 6344 df-ov 7140 df-om 7562 df-wrecs 7928 df-recs 7989 df-rdg 8027 df-nn 11620 df-2 11682 df-3 11683 df-4 11684 df-5 11685 df-6 11686 df-7 11687 df-8 11688 |
This theorem is referenced by: 9nn 11717 8nn0 11902 37prm 16432 43prm 16433 83prm 16434 317prm 16437 1259lem4 16445 1259lem5 16446 2503prm 16451 4001prm 16456 ipndx 16619 ipid 16620 ipsstr 16621 ressip 16630 phlstr 16631 tngip 23234 quart1cl 25413 quart1lem 25414 quart1 25415 log2tlbnd 25504 bposlem8 25848 lgsdir2lem2 25883 lgsdir2lem3 25884 2lgslem3a1 25957 2lgslem3b1 25958 2lgslem3c1 25959 2lgslem3d1 25960 2lgslem4 25963 2lgsoddprmlem2 25966 pntlemr 26159 pntlemj 26160 edgfid 26757 edgfndxnn 26758 edgfndxid 26759 baseltedgf 26760 ex-prmo 28217 hgt750lem 31924 hgt750lem2 31925 420gcd8e4 39139 420lcm8e840 39144 lcm8un 39162 rmydioph 39698 fmtnoprmfac2lem1 43808 127prm 43843 mod42tp1mod8 43847 8even 43958 8exp8mod9 43981 9fppr8 43982 nfermltl8rev 43987 nfermltlrev 43989 nnsum4primesevenALTV 44046 wtgoldbnnsum4prm 44047 bgoldbnnsum3prm 44049 bgoldbtbndlem1 44050 tgblthelfgott 44060 tgoldbachlt 44061 |
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