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Theorem ltabs 9683

Description: A number which is less than its absolute value is negative. (Contributed by Jim Kingdon, 12-Aug-2021.)

**Assertion**
Ref	Expression
ltabs	⊢ ((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) → 𝐴 < 0)

**Proof of Theorem ltabs**
Step	Hyp	Ref	Expression
1		simpr 103	. 2 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 𝐴 < 0) → 𝐴 < 0)
2		simpllr 486	. . . . 5 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) ∧ 0 < 𝐴) → 𝐴 < (abs‘𝐴))
3		simpll 481	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) → 𝐴 ∈ ℝ)
4	3	adantr 261	. . . . . 6 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) ∧ 0 < 𝐴) → 𝐴 ∈ ℝ)
5		0red 7028	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) ∧ 0 < 𝐴) → 0 ∈ ℝ)
6		simpr 103	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) ∧ 0 < 𝐴) → 0 < 𝐴)
7	5, 4, 6	ltled 7135	. . . . . 6 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) ∧ 0 < 𝐴) → 0 ≤ 𝐴)
8		absid 9669	. . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (abs‘𝐴) = 𝐴)
9	4, 7, 8	syl2anc 391	. . . . 5 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) ∧ 0 < 𝐴) → (abs‘𝐴) = 𝐴)
10	2, 9	breqtrd 3788	. . . 4 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) ∧ 0 < 𝐴) → 𝐴 < 𝐴)
11	4	ltnrd 7129	. . . 4 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) ∧ 0 < 𝐴) → ¬ 𝐴 < 𝐴)
12	10, 11	pm2.65da 587	. . 3 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) → ¬ 0 < 𝐴)
13		recn 7014	. . . . . . . 8 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ)
14		abscl 9649	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (abs‘𝐴) ∈ ℝ)
15	13, 14	syl 14	. . . . . . 7 ⊢ (𝐴 ∈ ℝ → (abs‘𝐴) ∈ ℝ)
16	15	ad2antrr 457	. . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) → (abs‘𝐴) ∈ ℝ)
17		simpr 103	. . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) → 0 < (abs‘𝐴))
18	16, 17	gt0ap0d 7619	. . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) → (abs‘𝐴) # 0)
19		abs00ap 9660	. . . . . 6 ⊢ (𝐴 ∈ ℂ → ((abs‘𝐴) # 0 ↔ 𝐴 # 0))
20	3, 13, 19	3syl 17	. . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) → ((abs‘𝐴) # 0 ↔ 𝐴 # 0))
21	18, 20	mpbid 135	. . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) → 𝐴 # 0)
22		0re 7027	. . . . 5 ⊢ 0 ∈ ℝ
23		reaplt 7579	. . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 0 ∈ ℝ) → (𝐴 # 0 ↔ (𝐴 < 0 ∨ 0 < 𝐴)))
24	3, 22, 23	sylancl 392	. . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) → (𝐴 # 0 ↔ (𝐴 < 0 ∨ 0 < 𝐴)))
25	21, 24	mpbid 135	. . 3 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) → (𝐴 < 0 ∨ 0 < 𝐴))
26	12, 25	ecased 1239	. 2 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) ∧ 0 < (abs‘𝐴)) → 𝐴 < 0)
27		axltwlin 7087	. . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ (abs‘𝐴) ∈ ℝ ∧ 0 ∈ ℝ) → (𝐴 < (abs‘𝐴) → (𝐴 < 0 ∨ 0 < (abs‘𝐴))))
28	22, 27	mp3an3 1221	. . . 4 ⊢ ((𝐴 ∈ ℝ ∧ (abs‘𝐴) ∈ ℝ) → (𝐴 < (abs‘𝐴) → (𝐴 < 0 ∨ 0 < (abs‘𝐴))))
29	15, 28	mpdan 398	. . 3 ⊢ (𝐴 ∈ ℝ → (𝐴 < (abs‘𝐴) → (𝐴 < 0 ∨ 0 < (abs‘𝐴))))
30	29	imp 115	. 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) → (𝐴 < 0 ∨ 0 < (abs‘𝐴)))
31	1, 26, 30	mpjaodan 711	1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 < (abs‘𝐴)) → 𝐴 < 0)

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 97 ↔ wb 98 ∨ wo 629 = wceq 1243 ∈ wcel 1393 class class class wbr 3764 ‘cfv 4902 ℂcc 6887 ℝcr 6888 0cc0 6889 < clt 7060 ≤ cle 7061 # cap 7572 abscabs 9595

This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-in1 544 ax-in2 545 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-13 1404 ax-14 1405 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-coll 3872 ax-sep 3875 ax-nul 3883 ax-pow 3927 ax-pr 3944 ax-un 4170 ax-setind 4262 ax-iinf 4311 ax-cnex 6975 ax-resscn 6976 ax-1cn 6977 ax-1re 6978 ax-icn 6979 ax-addcl 6980 ax-addrcl 6981 ax-mulcl 6982 ax-mulrcl 6983 ax-addcom 6984 ax-mulcom 6985 ax-addass 6986 ax-mulass 6987 ax-distr 6988 ax-i2m1 6989 ax-1rid 6991 ax-0id 6992 ax-rnegex 6993 ax-precex 6994 ax-cnre 6995 ax-pre-ltirr 6996 ax-pre-ltwlin 6997 ax-pre-lttrn 6998 ax-pre-apti 6999 ax-pre-ltadd 7000 ax-pre-mulgt0 7001 ax-pre-mulext 7002 ax-arch 7003 ax-caucvg 7004

This theorem depends on definitions: df-bi 110 df-dc 743 df-3or 886 df-3an 887 df-tru 1246 df-fal 1249 df-nf 1350 df-sb 1646 df-eu 1903 df-mo 1904 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-ne 2206 df-nel 2207 df-ral 2311 df-rex 2312 df-reu 2313 df-rmo 2314 df-rab 2315 df-v 2559 df-sbc 2765 df-csb 2853 df-dif 2920 df-un 2922 df-in 2924 df-ss 2931 df-nul 3225 df-if 3332 df-pw 3361 df-sn 3381 df-pr 3382 df-op 3384 df-uni 3581 df-int 3616 df-iun 3659 df-br 3765 df-opab 3819 df-mpt 3820 df-tr 3855 df-eprel 4026 df-id 4030 df-po 4033 df-iso 4034 df-iord 4103 df-on 4105 df-suc 4108 df-iom 4314 df-xp 4351 df-rel 4352 df-cnv 4353 df-co 4354 df-dm 4355 df-rn 4356 df-res 4357 df-ima 4358 df-iota 4867 df-fun 4904 df-fn 4905 df-f 4906 df-f1 4907 df-fo 4908 df-f1o 4909 df-fv 4910 df-riota 5468 df-ov 5515 df-oprab 5516 df-mpt2 5517 df-1st 5767 df-2nd 5768 df-recs 5920 df-irdg 5957 df-frec 5978 df-1o 6001 df-2o 6002 df-oadd 6005 df-omul 6006 df-er 6106 df-ec 6108 df-qs 6112 df-ni 6402 df-pli 6403 df-mi 6404 df-lti 6405 df-plpq 6442 df-mpq 6443 df-enq 6445 df-nqqs 6446 df-plqqs 6447 df-mqqs 6448 df-1nqqs 6449 df-rq 6450 df-ltnqqs 6451 df-enq0 6522 df-nq0 6523 df-0nq0 6524 df-plq0 6525 df-mq0 6526 df-inp 6564 df-i1p 6565 df-iplp 6566 df-iltp 6568 df-enr 6811 df-nr 6812 df-ltr 6815 df-0r 6816 df-1r 6817 df-0 6896 df-1 6897 df-r 6899 df-lt 6902 df-pnf 7062 df-mnf 7063 df-xr 7064 df-ltxr 7065 df-le 7066 df-sub 7184 df-neg 7185 df-reap 7566 df-ap 7573 df-div 7652 df-inn 7915 df-2 7973 df-3 7974 df-4 7975 df-n0 8182 df-z 8246 df-uz 8474 df-rp 8584 df-iseq 9212 df-iexp 9255 df-cj 9442 df-re 9443 df-im 9444 df-rsqrt 9596 df-abs 9597

This theorem is referenced by: abslt 9684 absle 9685

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