negelrp - Metamath Proof Explorer

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Theorem negelrp 12505

Description: Elementhood of a negation in the positive real numbers. (Contributed by Thierry Arnoux, 19-Sep-2018.)

**Assertion**
Ref	Expression
negelrp	⊢ (𝐴 ∈ ℝ → (-𝐴 ∈ ℝ⁺ ↔ 𝐴 < 0))

**Proof of Theorem negelrp**
Step	Hyp	Ref	Expression
1		elrp 12474	. 2 ⊢ (-𝐴 ∈ ℝ⁺ ↔ (-𝐴 ∈ ℝ ∧ 0 < -𝐴))
2		lt0neg1 11224	. . 3 ⊢ (𝐴 ∈ ℝ → (𝐴 < 0 ↔ 0 < -𝐴))
3		renegcl 11027	. . . 4 ⊢ (𝐴 ∈ ℝ → -𝐴 ∈ ℝ)
4	3	biantrurd 536	. . 3 ⊢ (𝐴 ∈ ℝ → (0 < -𝐴 ↔ (-𝐴 ∈ ℝ ∧ 0 < -𝐴)))
5	2, 4	bitr2d 283	. 2 ⊢ (𝐴 ∈ ℝ → ((-𝐴 ∈ ℝ ∧ 0 < -𝐴) ↔ 𝐴 < 0))
6	1, 5	syl5bb 286	1 ⊢ (𝐴 ∈ ℝ → (-𝐴 ∈ ℝ⁺ ↔ 𝐴 < 0))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 ∈ wcel 2114 class class class wbr 5030 ℝcr 10614 0cc0 10615 < clt 10753 -cneg 10949 ℝ⁺crp 12472

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1975 ax-7 2020 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2162 ax-12 2179 ax-ext 2710 ax-sep 5167 ax-nul 5174 ax-pow 5232 ax-pr 5296 ax-un 7479 ax-resscn 10672 ax-1cn 10673 ax-icn 10674 ax-addcl 10675 ax-addrcl 10676 ax-mulcl 10677 ax-mulrcl 10678 ax-mulcom 10679 ax-addass 10680 ax-mulass 10681 ax-distr 10682 ax-i2m1 10683 ax-1ne0 10684 ax-1rid 10685 ax-rnegex 10686 ax-rrecex 10687 ax-cnre 10688 ax-pre-lttri 10689 ax-pre-lttrn 10690 ax-pre-ltadd 10691

This theorem depends on definitions: df-bi 210 df-an 400 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2075 df-mo 2540 df-eu 2570 df-clab 2717 df-cleq 2730 df-clel 2811 df-nfc 2881 df-ne 2935 df-nel 3039 df-ral 3058 df-rex 3059 df-reu 3060 df-rab 3062 df-v 3400 df-sbc 3681 df-csb 3791 df-dif 3846 df-un 3848 df-in 3850 df-ss 3860 df-nul 4212 df-if 4415 df-pw 4490 df-sn 4517 df-pr 4519 df-op 4523 df-uni 4797 df-br 5031 df-opab 5093 df-mpt 5111 df-id 5429 df-po 5442 df-so 5443 df-xp 5531 df-rel 5532 df-cnv 5533 df-co 5534 df-dm 5535 df-rn 5536 df-res 5537 df-ima 5538 df-iota 6297 df-fun 6341 df-fn 6342 df-f 6343 df-f1 6344 df-fo 6345 df-f1o 6346 df-fv 6347 df-riota 7127 df-ov 7173 df-oprab 7174 df-mpo 7175 df-er 8320 df-en 8556 df-dom 8557 df-sdom 8558 df-pnf 10755 df-mnf 10756 df-xr 10757 df-ltxr 10758 df-le 10759 df-sub 10950 df-neg 10951 df-rp 12473

This theorem is referenced by: negelrpd 12506 mul2lt0rlt0 12574 signsply0 32100