ne0gt0 - Metamath Proof Explorer

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Theorem ne0gt0 11318

Description: A nonzero nonnegative number is positive. (Contributed by NM, 20-Nov-2007.)

**Assertion**
Ref	Expression
ne0gt0	⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (𝐴 ≠ 0 ↔ 0 < 𝐴))

**Proof of Theorem ne0gt0**
Step	Hyp	Ref	Expression
1		0re 11215	. . . 4 ⊢ 0 ∈ ℝ
2		lttri2 11295	. . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 0 ∈ ℝ) → (𝐴 ≠ 0 ↔ (𝐴 < 0 ∨ 0 < 𝐴)))
3	1, 2	mpan2 688	. . 3 ⊢ (𝐴 ∈ ℝ → (𝐴 ≠ 0 ↔ (𝐴 < 0 ∨ 0 < 𝐴)))
4	3	adantr 480	. 2 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (𝐴 ≠ 0 ↔ (𝐴 < 0 ∨ 0 < 𝐴)))
5		lenlt 11291	. . . . 5 ⊢ ((0 ∈ ℝ ∧ 𝐴 ∈ ℝ) → (0 ≤ 𝐴 ↔ ¬ 𝐴 < 0))
6	1, 5	mpan 687	. . . 4 ⊢ (𝐴 ∈ ℝ → (0 ≤ 𝐴 ↔ ¬ 𝐴 < 0))
7	6	biimpa 476	. . 3 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → ¬ 𝐴 < 0)
8		biorf 933	. . 3 ⊢ (¬ 𝐴 < 0 → (0 < 𝐴 ↔ (𝐴 < 0 ∨ 0 < 𝐴)))
9	7, 8	syl 17	. 2 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (0 < 𝐴 ↔ (𝐴 < 0 ∨ 0 < 𝐴)))
10	4, 9	bitr4d 282	1 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (𝐴 ≠ 0 ↔ 0 < 𝐴))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 ∨ wo 844 ∈ wcel 2098 ≠ wne 2932 class class class wbr 5139 ℝcr 11106 0cc0 11107 < clt 11247 ≤ cle 11248

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2695 ax-sep 5290 ax-nul 5297 ax-pow 5354 ax-pr 5418 ax-un 7719 ax-resscn 11164 ax-1cn 11165 ax-addrcl 11168 ax-rnegex 11178 ax-cnre 11180 ax-pre-lttri 11181 ax-pre-lttrn 11182

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2526 df-eu 2555 df-clab 2702 df-cleq 2716 df-clel 2802 df-nfc 2877 df-ne 2933 df-nel 3039 df-ral 3054 df-rex 3063 df-rab 3425 df-v 3468 df-sbc 3771 df-csb 3887 df-dif 3944 df-un 3946 df-in 3948 df-ss 3958 df-nul 4316 df-if 4522 df-pw 4597 df-sn 4622 df-pr 4624 df-op 4628 df-uni 4901 df-br 5140 df-opab 5202 df-mpt 5223 df-id 5565 df-po 5579 df-so 5580 df-xp 5673 df-rel 5674 df-cnv 5675 df-co 5676 df-dm 5677 df-rn 5678 df-res 5679 df-ima 5680 df-iota 6486 df-fun 6536 df-fn 6537 df-f 6538 df-f1 6539 df-fo 6540 df-f1o 6541 df-fv 6542 df-er 8700 df-en 8937 df-dom 8938 df-sdom 8939 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253

This theorem is referenced by: ne0gt0d 11350 hashneq0 14325 fvmptnn04ifb 22697 nmgt0 24483 mdegle0 25957 nvgt0 30422

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