ne0gt0 - Metamath Proof Explorer

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Theorem ne0gt0 11281

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 11176	. . . 4 ⊢ 0 ∈ ℝ
2		lttri2 11258	. . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 0 ∈ ℝ) → (𝐴 ≠ 0 ↔ (𝐴 < 0 ∨ 0 < 𝐴)))
3	1, 2	mpan2 701	. . 3 ⊢ (𝐴 ∈ ℝ → (𝐴 ≠ 0 ↔ (𝐴 < 0 ∨ 0 < 𝐴)))
4	3	adantr 484	. 2 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (𝐴 ≠ 0 ↔ (𝐴 < 0 ∨ 0 < 𝐴)))
5		lenlt 11254	. . . . 5 ⊢ ((0 ∈ ℝ ∧ 𝐴 ∈ ℝ) → (0 ≤ 𝐴 ↔ ¬ 𝐴 < 0))
6	1, 5	mpan 700	. . . 4 ⊢ (𝐴 ∈ ℝ → (0 ≤ 𝐴 ↔ ¬ 𝐴 < 0))
7	6	biimpa 480	. . 3 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → ¬ 𝐴 < 0)
8		biorf 947	. . 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 284	1 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (𝐴 ≠ 0 ↔ 0 < 𝐴))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 ∧ wa 399 ∨ wo 858 ∈ wcel 2141 ≠ wne 2956 class class class wbr 5097 ℝcr 11065 0cc0 11066 < clt 11209 ≤ cle 11210

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-sep 5243 ax-nul 5253 ax-pow 5319 ax-pr 5387 ax-un 7712 ax-resscn 11123 ax-1cn 11124 ax-addrcl 11127 ax-rnegex 11137 ax-cnre 11139 ax-pre-lttri 11140 ax-pre-lttrn 11141

This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-rab 3414 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-br 5098 df-opab 5160 df-mpt 5179 df-id 5538 df-po 5551 df-so 5552 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-res 5655 df-ima 5656 df-iota 6471 df-fun 6517 df-fn 6518 df-f 6519 df-f1 6520 df-fo 6521 df-f1o 6522 df-fv 6523 df-er 8671 df-en 8921 df-dom 8922 df-sdom 8923 df-pnf 11211 df-mnf 11212 df-xr 11213 df-ltxr 11214 df-le 11215

This theorem is referenced by: ne0gt0d 11313 hashneq0 14370 fvmptnn04ifb 22898 nmgt0 24677 mdegle0 26124 nvgt0 30833

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