elnnz - Metamath Proof Explorer

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Theorem elnnz 11994

Description: Positive integer property expressed in terms of integers. (Contributed by NM, 8-Jan-2002.)

**Assertion**
Ref	Expression
elnnz	⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℤ ∧ 0 < 𝑁))

**Proof of Theorem elnnz**
Step	Hyp	Ref	Expression
1		nnre 11647	. . . 4 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℝ)
2		orc 863	. . . 4 ⊢ (𝑁 ∈ ℕ → (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)))
3		nngt0 11671	. . . 4 ⊢ (𝑁 ∈ ℕ → 0 < 𝑁)
4	1, 2, 3	jca31 517	. . 3 ⊢ (𝑁 ∈ ℕ → ((𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))) ∧ 0 < 𝑁))
5		idd 24	. . . . . . 7 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → (𝑁 ∈ ℕ → 𝑁 ∈ ℕ))
6		lt0neg2 11149	. . . . . . . . . . . 12 ⊢ (𝑁 ∈ ℝ → (0 < 𝑁 ↔ -𝑁 < 0))
7		renegcl 10951	. . . . . . . . . . . . 13 ⊢ (𝑁 ∈ ℝ → -𝑁 ∈ ℝ)
8		0re 10645	. . . . . . . . . . . . 13 ⊢ 0 ∈ ℝ
9		ltnsym 10740	. . . . . . . . . . . . 13 ⊢ ((-𝑁 ∈ ℝ ∧ 0 ∈ ℝ) → (-𝑁 < 0 → ¬ 0 < -𝑁))
10	7, 8, 9	sylancl 588	. . . . . . . . . . . 12 ⊢ (𝑁 ∈ ℝ → (-𝑁 < 0 → ¬ 0 < -𝑁))
11	6, 10	sylbid 242	. . . . . . . . . . 11 ⊢ (𝑁 ∈ ℝ → (0 < 𝑁 → ¬ 0 < -𝑁))
12	11	imp 409	. . . . . . . . . 10 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ¬ 0 < -𝑁)
13		nngt0 11671	. . . . . . . . . 10 ⊢ (-𝑁 ∈ ℕ → 0 < -𝑁)
14	12, 13	nsyl 142	. . . . . . . . 9 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ¬ -𝑁 ∈ ℕ)
15		gt0ne0 11107	. . . . . . . . . 10 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → 𝑁 ≠ 0)
16	15	neneqd 3023	. . . . . . . . 9 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ¬ 𝑁 = 0)
17		ioran 980	. . . . . . . . 9 ⊢ (¬ (-𝑁 ∈ ℕ ∨ 𝑁 = 0) ↔ (¬ -𝑁 ∈ ℕ ∧ ¬ 𝑁 = 0))
18	14, 16, 17	sylanbrc 585	. . . . . . . 8 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ¬ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))
19	18	pm2.21d 121	. . . . . . 7 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ((-𝑁 ∈ ℕ ∨ 𝑁 = 0) → 𝑁 ∈ ℕ))
20	5, 19	jaod 855	. . . . . 6 ⊢ ((𝑁 ∈ ℝ ∧ 0 < 𝑁) → ((𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)) → 𝑁 ∈ ℕ))
21	20	ex 415	. . . . 5 ⊢ (𝑁 ∈ ℝ → (0 < 𝑁 → ((𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)) → 𝑁 ∈ ℕ)))
22	21	com23 86	. . . 4 ⊢ (𝑁 ∈ ℝ → ((𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)) → (0 < 𝑁 → 𝑁 ∈ ℕ)))
23	22	imp31 420	. . 3 ⊢ (((𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))) ∧ 0 < 𝑁) → 𝑁 ∈ ℕ)
24	4, 23	impbii 211	. 2 ⊢ (𝑁 ∈ ℕ ↔ ((𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))) ∧ 0 < 𝑁))
25		elz 11986	. . . 4 ⊢ (𝑁 ∈ ℤ ↔ (𝑁 ∈ ℝ ∧ (𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ)))
26		3orrot 1088	. . . . . 6 ⊢ ((𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ) ↔ (𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ ∨ 𝑁 = 0))
27		3orass 1086	. . . . . 6 ⊢ ((𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ ∨ 𝑁 = 0) ↔ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)))
28	26, 27	bitri 277	. . . . 5 ⊢ ((𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ) ↔ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0)))
29	28	anbi2i 624	. . . 4 ⊢ ((𝑁 ∈ ℝ ∧ (𝑁 = 0 ∨ 𝑁 ∈ ℕ ∨ -𝑁 ∈ ℕ)) ↔ (𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))))
30	25, 29	bitri 277	. . 3 ⊢ (𝑁 ∈ ℤ ↔ (𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))))
31	30	anbi1i 625	. 2 ⊢ ((𝑁 ∈ ℤ ∧ 0 < 𝑁) ↔ ((𝑁 ∈ ℝ ∧ (𝑁 ∈ ℕ ∨ (-𝑁 ∈ ℕ ∨ 𝑁 = 0))) ∧ 0 < 𝑁))
32	24, 31	bitr4i 280	1 ⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℤ ∧ 0 < 𝑁))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 ∧ wa 398 ∨ wo 843 ∨ w3o 1082 = wceq 1537 ∈ wcel 2114 class class class wbr 5068 ℝcr 10538 0cc0 10539 < clt 10677 -cneg 10873 ℕcn 11640 ℤcz 11984

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 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616

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 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-iun 4923 df-br 5069 df-opab 5131 df-mpt 5149 df-tr 5175 df-id 5462 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-we 5518 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-pred 6150 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-om 7583 df-wrecs 7949 df-recs 8010 df-rdg 8048 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-nn 11641 df-z 11985

This theorem is referenced by: elnn0z 11997 elnnz1 12011 znnsub 12031 nn0ge0div 12054 msqznn 12067 elpq 12377 lbfzo0 13080 elfzo0z 13082 fzofzim 13087 fzo1fzo0n0 13091 elfzodifsumelfzo 13106 elfznelfzo 13145 nnesq 13591 swrdlsw 14031 pfxccatin12lem3 14096 repswswrd 14148 cshwcsh2id 14192 swrd2lsw 14316 2swrd2eqwrdeq 14317 nnabscl 14687 iseralt 15043 sqrt2irrlem 15603 p1modz1 15616 nndivdvds 15618 oddge22np1 15700 evennn2n 15702 nno 15735 nnoddm1d2 15739 ndvdsadd 15763 bitsfzolem 15785 sqgcd 15911 qredeu 16004 prmind2 16031 qgt0numnn 16093 oddprm 16149 pythagtriplem6 16160 pythagtriplem11 16164 pythagtriplem13 16166 pythagtriplem19 16172 pc2dvds 16217 pcadd 16227 prmreclem3 16256 4sqlem11 16293 4sqlem12 16294 prmgaplem7 16395 cshwshashlem2 16432 subgmulg 18295 znidomb 20710 sgmnncl 25726 muinv 25772 mersenne 25805 bposlem6 25867 gausslemma2dlem1a 25943 lgseisenlem1 25953 lgsquadlem1 25958 lgsquadlem2 25959 2sqlem8 26004 2sqnn0 26016 dchrisum0flblem2 26087 clwlkclwwlklem2a2 27773 clwlkclwwlklem2a4 27777 clwlkclwwlklem2a 27778 eucrct2eupth1 28025 nn0prpwlem 33672 poimirlem7 34901 poimirlem29 34923 mblfinlem2 34932 rtprmirr 39201 dffltz 39278 irrapxlem4 39429 rmspecnonsq 39511 rmynn 39560 jm2.24 39567 jm2.23 39600 jm2.20nn 39601 jm2.27a 39609 jm2.27c 39611 rmydioph 39618 jm3.1lem3 39623 sumnnodd 41918 dvnxpaek 42234 dirkertrigeqlem3 42392 fourierdlem47 42445 fouriersw 42523 etransclem15 42541 etransclem24 42550 etransclem25 42551 etransclem35 42561 etransclem48 42574 zm1nn 43509 iccpartigtl 43590 nnoALTV 43867 nneven 43870 ztprmneprm 44402 blennngt2o2 44659

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