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Mirrors > Home > ILE Home > Th. List > leabs | GIF version |
Description: A real number is less than or equal to its absolute value. (Contributed by NM, 27-Feb-2005.) |
Ref | Expression |
---|---|
leabs | ⊢ (𝐴 ∈ ℝ → 𝐴 ≤ (abs‘𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 109 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ (abs‘𝐴) < 0) → (abs‘𝐴) < 0) | |
2 | recn 7844 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
3 | absge0 10937 | . . . . . . . 8 ⊢ (𝐴 ∈ ℂ → 0 ≤ (abs‘𝐴)) | |
4 | 2, 3 | syl 14 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → 0 ≤ (abs‘𝐴)) |
5 | 4 | ad2antrr 480 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ (abs‘𝐴) < 0) → 0 ≤ (abs‘𝐴)) |
6 | 0red 7858 | . . . . . . 7 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ (abs‘𝐴) < 0) → 0 ∈ ℝ) | |
7 | abscl 10928 | . . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → (abs‘𝐴) ∈ ℝ) | |
8 | 2, 7 | syl 14 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ → (abs‘𝐴) ∈ ℝ) |
9 | 8 | ad2antrr 480 | . . . . . . 7 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ (abs‘𝐴) < 0) → (abs‘𝐴) ∈ ℝ) |
10 | 6, 9 | lenltd 7972 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ (abs‘𝐴) < 0) → (0 ≤ (abs‘𝐴) ↔ ¬ (abs‘𝐴) < 0)) |
11 | 5, 10 | mpbid 146 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ (abs‘𝐴) < 0) → ¬ (abs‘𝐴) < 0) |
12 | 1, 11 | pm2.21fal 1352 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ (abs‘𝐴) < 0) → ⊥) |
13 | simpll 519 | . . . . . . 7 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ 0 < 𝐴) → 𝐴 ∈ ℝ) | |
14 | 0red 7858 | . . . . . . . 8 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ 0 < 𝐴) → 0 ∈ ℝ) | |
15 | simpr 109 | . . . . . . . 8 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ 0 < 𝐴) → 0 < 𝐴) | |
16 | 14, 13, 15 | ltled 7973 | . . . . . . 7 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ 0 < 𝐴) → 0 ≤ 𝐴) |
17 | absid 10948 | . . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (abs‘𝐴) = 𝐴) | |
18 | 13, 16, 17 | syl2anc 409 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ 0 < 𝐴) → (abs‘𝐴) = 𝐴) |
19 | simplr 520 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ 0 < 𝐴) → (abs‘𝐴) < 𝐴) | |
20 | 18, 19 | eqbrtrrd 3984 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ 0 < 𝐴) → 𝐴 < 𝐴) |
21 | 13 | ltnrd 7967 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ 0 < 𝐴) → ¬ 𝐴 < 𝐴) |
22 | 20, 21 | pm2.21fal 1352 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) ∧ 0 < 𝐴) → ⊥) |
23 | 0re 7857 | . . . . . . 7 ⊢ 0 ∈ ℝ | |
24 | axltwlin 7924 | . . . . . . 7 ⊢ (((abs‘𝐴) ∈ ℝ ∧ 𝐴 ∈ ℝ ∧ 0 ∈ ℝ) → ((abs‘𝐴) < 𝐴 → ((abs‘𝐴) < 0 ∨ 0 < 𝐴))) | |
25 | 23, 24 | mp3an3 1305 | . . . . . 6 ⊢ (((abs‘𝐴) ∈ ℝ ∧ 𝐴 ∈ ℝ) → ((abs‘𝐴) < 𝐴 → ((abs‘𝐴) < 0 ∨ 0 < 𝐴))) |
26 | 8, 25 | mpancom 419 | . . . . 5 ⊢ (𝐴 ∈ ℝ → ((abs‘𝐴) < 𝐴 → ((abs‘𝐴) < 0 ∨ 0 < 𝐴))) |
27 | 26 | imp 123 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) → ((abs‘𝐴) < 0 ∨ 0 < 𝐴)) |
28 | 12, 22, 27 | mpjaodan 788 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ (abs‘𝐴) < 𝐴) → ⊥) |
29 | 28 | inegd 1351 | . 2 ⊢ (𝐴 ∈ ℝ → ¬ (abs‘𝐴) < 𝐴) |
30 | id 19 | . . 3 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ) | |
31 | 30, 8 | lenltd 7972 | . 2 ⊢ (𝐴 ∈ ℝ → (𝐴 ≤ (abs‘𝐴) ↔ ¬ (abs‘𝐴) < 𝐴)) |
32 | 29, 31 | mpbird 166 | 1 ⊢ (𝐴 ∈ ℝ → 𝐴 ≤ (abs‘𝐴)) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 103 ∨ wo 698 = wceq 1332 ⊥wfal 1337 ∈ wcel 2125 class class class wbr 3961 ‘cfv 5163 ℂcc 7709 ℝcr 7710 0cc0 7711 < clt 7891 ≤ cle 7892 abscabs 10874 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1481 ax-10 1482 ax-11 1483 ax-i12 1484 ax-bndl 1486 ax-4 1487 ax-17 1503 ax-i9 1507 ax-ial 1511 ax-i5r 1512 ax-13 2127 ax-14 2128 ax-ext 2136 ax-coll 4075 ax-sep 4078 ax-nul 4086 ax-pow 4130 ax-pr 4164 ax-un 4388 ax-setind 4490 ax-iinf 4541 ax-cnex 7802 ax-resscn 7803 ax-1cn 7804 ax-1re 7805 ax-icn 7806 ax-addcl 7807 ax-addrcl 7808 ax-mulcl 7809 ax-mulrcl 7810 ax-addcom 7811 ax-mulcom 7812 ax-addass 7813 ax-mulass 7814 ax-distr 7815 ax-i2m1 7816 ax-0lt1 7817 ax-1rid 7818 ax-0id 7819 ax-rnegex 7820 ax-precex 7821 ax-cnre 7822 ax-pre-ltirr 7823 ax-pre-ltwlin 7824 ax-pre-lttrn 7825 ax-pre-apti 7826 ax-pre-ltadd 7827 ax-pre-mulgt0 7828 ax-pre-mulext 7829 ax-arch 7830 ax-caucvg 7831 |
This theorem depends on definitions: df-bi 116 df-dc 821 df-3or 964 df-3an 965 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1740 df-eu 2006 df-mo 2007 df-clab 2141 df-cleq 2147 df-clel 2150 df-nfc 2285 df-ne 2325 df-nel 2420 df-ral 2437 df-rex 2438 df-reu 2439 df-rmo 2440 df-rab 2441 df-v 2711 df-sbc 2934 df-csb 3028 df-dif 3100 df-un 3102 df-in 3104 df-ss 3111 df-nul 3391 df-if 3502 df-pw 3541 df-sn 3562 df-pr 3563 df-op 3565 df-uni 3769 df-int 3804 df-iun 3847 df-br 3962 df-opab 4022 df-mpt 4023 df-tr 4059 df-id 4248 df-po 4251 df-iso 4252 df-iord 4321 df-on 4323 df-ilim 4324 df-suc 4326 df-iom 4544 df-xp 4585 df-rel 4586 df-cnv 4587 df-co 4588 df-dm 4589 df-rn 4590 df-res 4591 df-ima 4592 df-iota 5128 df-fun 5165 df-fn 5166 df-f 5167 df-f1 5168 df-fo 5169 df-f1o 5170 df-fv 5171 df-riota 5770 df-ov 5817 df-oprab 5818 df-mpo 5819 df-1st 6078 df-2nd 6079 df-recs 6242 df-frec 6328 df-pnf 7893 df-mnf 7894 df-xr 7895 df-ltxr 7896 df-le 7897 df-sub 8027 df-neg 8028 df-reap 8429 df-ap 8436 df-div 8525 df-inn 8813 df-2 8871 df-3 8872 df-4 8873 df-n0 9070 df-z 9147 df-uz 9419 df-rp 9539 df-seqfrec 10323 df-exp 10397 df-cj 10719 df-re 10720 df-im 10721 df-rsqrt 10875 df-abs 10876 |
This theorem is referenced by: abslt 10965 absle 10966 abssubap0 10967 releabs 10973 leabsi 11005 leabsd 11038 dfabsmax 11094 |
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