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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 11701 | . 2 ⊢ 9 = (8 + 1) | |
2 | 8nn 11726 | . . 3 ⊢ 8 ∈ ℕ | |
3 | peano2nn 11644 | . . 3 ⊢ (8 ∈ ℕ → (8 + 1) ∈ ℕ) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ (8 + 1) ∈ ℕ |
5 | 1, 4 | eqeltri 2909 | 1 ⊢ 9 ∈ ℕ |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2110 (class class class)co 7150 1c1 10532 + caddc 10534 ℕcn 11632 8c8 11692 9c9 11693 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2156 ax-12 2172 ax-ext 2793 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5322 ax-un 7455 ax-1cn 10589 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3497 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4562 df-pr 4564 df-tp 4566 df-op 4568 df-uni 4833 df-iun 4914 df-br 5060 df-opab 5122 df-mpt 5140 df-tr 5166 df-id 5455 df-eprel 5460 df-po 5469 df-so 5470 df-fr 5509 df-we 5511 df-xp 5556 df-rel 5557 df-cnv 5558 df-co 5559 df-dm 5560 df-rn 5561 df-res 5562 df-ima 5563 df-pred 6143 df-ord 6189 df-on 6190 df-lim 6191 df-suc 6192 df-iota 6309 df-fun 6352 df-fn 6353 df-f 6354 df-f1 6355 df-fo 6356 df-f1o 6357 df-fv 6358 df-ov 7153 df-om 7575 df-wrecs 7941 df-recs 8002 df-rdg 8040 df-nn 11633 df-2 11694 df-3 11695 df-4 11696 df-5 11697 df-6 11698 df-7 11699 df-8 11700 df-9 11701 |
This theorem is referenced by: 9nn0 11915 9p1e10 12094 10nn 12108 3dvdsdec 15675 19prm 16445 prmlem2 16447 37prm 16448 43prm 16449 83prm 16450 139prm 16451 163prm 16452 317prm 16453 631prm 16454 1259lem1 16458 1259lem2 16459 1259lem3 16460 1259lem4 16461 1259lem5 16462 2503lem3 16466 tsetndx 16653 tsetid 16654 topgrpstr 16655 resstset 16659 otpsstr 16662 odrngstr 16673 imasvalstr 16719 ipostr 17757 oppgtset 18474 mgptset 19241 sratset 19950 psrvalstr 20137 cnfldstr 20541 eltpsg 21545 indistpsALT 21615 2logb9irr 25367 sqrt2cxp2logb9e3 25371 mcubic 25419 log2cnv 25516 log2tlbnd 25517 log2ublem2 25519 log2ub 25521 bposlem7 25860 ex-cnv 28210 ex-dm 28212 ex-gcd 28230 ex-lcm 28231 ex-prmo 28232 hgt750lem2 31918 rmydioph 39604 deccarry 43504 257prm 43716 fmtno4nprmfac193 43729 139prmALT 43752 127prm 43756 8exp8mod9 43894 9fppr8 43895 nfermltl8rev 43900 wtgoldbnnsum4prm 43960 bgoldbnnsum3prm 43962 bgoldbtbndlem1 43963 tgblthelfgott 43973 |
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