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Mirrors > Home > MPE Home > Th. List > 9nn | Structured version Visualization version GIF version |
Description: 9 is a positive integer. (Contributed by NM, 21-Oct-2012.) |
Ref | Expression |
---|---|
9nn | ⊢ 9 ∈ ℕ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-9 11695 | . 2 ⊢ 9 = (8 + 1) | |
2 | 8nn 11720 | . . 3 ⊢ 8 ∈ ℕ | |
3 | peano2nn 11637 | . . 3 ⊢ (8 ∈ ℕ → (8 + 1) ∈ ℕ) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ (8 + 1) ∈ ℕ |
5 | 1, 4 | eqeltri 2886 | 1 ⊢ 9 ∈ ℕ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2111 (class class class)co 7135 1c1 10527 + caddc 10529 ℕcn 11625 8c8 11686 9c9 11687 |
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 df-9 11695 |
This theorem is referenced by: 9nn0 11909 9p1e10 12088 10nn 12102 3dvdsdec 15673 19prm 16443 prmlem2 16445 37prm 16446 43prm 16447 83prm 16448 139prm 16449 163prm 16450 317prm 16451 631prm 16452 1259lem1 16456 1259lem2 16457 1259lem3 16458 1259lem4 16459 1259lem5 16460 2503lem3 16464 tsetndx 16651 tsetid 16652 topgrpstr 16653 resstset 16657 otpsstr 16660 odrngstr 16671 imasvalstr 16717 ipostr 17755 oppgtset 18472 mgptset 19240 sratset 19949 cnfldstr 20093 psrvalstr 20601 eltpsg 21548 indistpsALT 21618 2logb9irr 25381 sqrt2cxp2logb9e3 25385 mcubic 25433 log2cnv 25530 log2tlbnd 25531 log2ublem2 25533 log2ub 25535 bposlem7 25874 ex-cnv 28222 ex-dm 28224 ex-gcd 28242 ex-lcm 28243 ex-prmo 28244 idlsrgstr 31055 hgt750lem2 32033 lcmineqlem23 39339 rmydioph 39955 deccarry 43868 257prm 44078 fmtno4nprmfac193 44091 139prmALT 44113 127prm 44116 8exp8mod9 44254 9fppr8 44255 nfermltl8rev 44260 wtgoldbnnsum4prm 44320 bgoldbnnsum3prm 44322 bgoldbtbndlem1 44323 tgblthelfgott 44333 |
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