![]() |
Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
|
Mirrors > Home > ILE Home > Th. List > dfabsmax | GIF version |
Description: Absolute value of a real number in terms of maximum. Definition 3.13 of [Geuvers], p. 11. (Contributed by BJ and Jim Kingdon, 21-Dec-2021.) |
Ref | Expression |
---|---|
dfabsmax | ⊢ (𝐴 ∈ ℝ → (abs‘𝐴) = sup({𝐴, -𝐴}, ℝ, < )) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 19 | . . . 4 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ) | |
2 | renegcl 8195 | . . . . 5 ⊢ (𝐴 ∈ ℝ → -𝐴 ∈ ℝ) | |
3 | maxcl 11190 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ -𝐴 ∈ ℝ) → sup({𝐴, -𝐴}, ℝ, < ) ∈ ℝ) | |
4 | 2, 3 | mpdan 421 | . . . 4 ⊢ (𝐴 ∈ ℝ → sup({𝐴, -𝐴}, ℝ, < ) ∈ ℝ) |
5 | maxle2 11192 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ -𝐴 ∈ ℝ) → -𝐴 ≤ sup({𝐴, -𝐴}, ℝ, < )) | |
6 | 2, 5 | mpdan 421 | . . . 4 ⊢ (𝐴 ∈ ℝ → -𝐴 ≤ sup({𝐴, -𝐴}, ℝ, < )) |
7 | 1, 4, 6 | lenegcon1d 8461 | . . 3 ⊢ (𝐴 ∈ ℝ → -sup({𝐴, -𝐴}, ℝ, < ) ≤ 𝐴) |
8 | maxle1 11191 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ -𝐴 ∈ ℝ) → 𝐴 ≤ sup({𝐴, -𝐴}, ℝ, < )) | |
9 | 2, 8 | mpdan 421 | . . 3 ⊢ (𝐴 ∈ ℝ → 𝐴 ≤ sup({𝐴, -𝐴}, ℝ, < )) |
10 | absle 11069 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ sup({𝐴, -𝐴}, ℝ, < ) ∈ ℝ) → ((abs‘𝐴) ≤ sup({𝐴, -𝐴}, ℝ, < ) ↔ (-sup({𝐴, -𝐴}, ℝ, < ) ≤ 𝐴 ∧ 𝐴 ≤ sup({𝐴, -𝐴}, ℝ, < )))) | |
11 | 4, 10 | mpdan 421 | . . 3 ⊢ (𝐴 ∈ ℝ → ((abs‘𝐴) ≤ sup({𝐴, -𝐴}, ℝ, < ) ↔ (-sup({𝐴, -𝐴}, ℝ, < ) ≤ 𝐴 ∧ 𝐴 ≤ sup({𝐴, -𝐴}, ℝ, < )))) |
12 | 7, 9, 11 | mpbir2and 944 | . 2 ⊢ (𝐴 ∈ ℝ → (abs‘𝐴) ≤ sup({𝐴, -𝐴}, ℝ, < )) |
13 | recn 7922 | . . . 4 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
14 | 13 | abscld 11161 | . . 3 ⊢ (𝐴 ∈ ℝ → (abs‘𝐴) ∈ ℝ) |
15 | leabs 11054 | . . 3 ⊢ (𝐴 ∈ ℝ → 𝐴 ≤ (abs‘𝐴)) | |
16 | 2 | leabsd 11141 | . . . 4 ⊢ (𝐴 ∈ ℝ → -𝐴 ≤ (abs‘-𝐴)) |
17 | 13 | absnegd 11169 | . . . 4 ⊢ (𝐴 ∈ ℝ → (abs‘-𝐴) = (abs‘𝐴)) |
18 | 16, 17 | breqtrd 4026 | . . 3 ⊢ (𝐴 ∈ ℝ → -𝐴 ≤ (abs‘𝐴)) |
19 | maxleast 11193 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ -𝐴 ∈ ℝ ∧ (abs‘𝐴) ∈ ℝ) ∧ (𝐴 ≤ (abs‘𝐴) ∧ -𝐴 ≤ (abs‘𝐴))) → sup({𝐴, -𝐴}, ℝ, < ) ≤ (abs‘𝐴)) | |
20 | 1, 2, 14, 15, 18, 19 | syl32anc 1246 | . 2 ⊢ (𝐴 ∈ ℝ → sup({𝐴, -𝐴}, ℝ, < ) ≤ (abs‘𝐴)) |
21 | 14, 4 | letri3d 8050 | . 2 ⊢ (𝐴 ∈ ℝ → ((abs‘𝐴) = sup({𝐴, -𝐴}, ℝ, < ) ↔ ((abs‘𝐴) ≤ sup({𝐴, -𝐴}, ℝ, < ) ∧ sup({𝐴, -𝐴}, ℝ, < ) ≤ (abs‘𝐴)))) |
22 | 12, 20, 21 | mpbir2and 944 | 1 ⊢ (𝐴 ∈ ℝ → (abs‘𝐴) = sup({𝐴, -𝐴}, ℝ, < )) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1353 ∈ wcel 2148 {cpr 3592 class class class wbr 4000 ‘cfv 5211 supcsup 6974 ℝcr 7788 < clt 7969 ≤ cle 7970 -cneg 8106 abscabs 10977 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-coll 4115 ax-sep 4118 ax-nul 4126 ax-pow 4171 ax-pr 4205 ax-un 4429 ax-setind 4532 ax-iinf 4583 ax-cnex 7880 ax-resscn 7881 ax-1cn 7882 ax-1re 7883 ax-icn 7884 ax-addcl 7885 ax-addrcl 7886 ax-mulcl 7887 ax-mulrcl 7888 ax-addcom 7889 ax-mulcom 7890 ax-addass 7891 ax-mulass 7892 ax-distr 7893 ax-i2m1 7894 ax-0lt1 7895 ax-1rid 7896 ax-0id 7897 ax-rnegex 7898 ax-precex 7899 ax-cnre 7900 ax-pre-ltirr 7901 ax-pre-ltwlin 7902 ax-pre-lttrn 7903 ax-pre-apti 7904 ax-pre-ltadd 7905 ax-pre-mulgt0 7906 ax-pre-mulext 7907 ax-arch 7908 ax-caucvg 7909 |
This theorem depends on definitions: df-bi 117 df-dc 835 df-3or 979 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-reu 2462 df-rmo 2463 df-rab 2464 df-v 2739 df-sbc 2963 df-csb 3058 df-dif 3131 df-un 3133 df-in 3135 df-ss 3142 df-nul 3423 df-if 3535 df-pw 3576 df-sn 3597 df-pr 3598 df-op 3600 df-uni 3808 df-int 3843 df-iun 3886 df-br 4001 df-opab 4062 df-mpt 4063 df-tr 4099 df-id 4289 df-po 4292 df-iso 4293 df-iord 4362 df-on 4364 df-ilim 4365 df-suc 4367 df-iom 4586 df-xp 4628 df-rel 4629 df-cnv 4630 df-co 4631 df-dm 4632 df-rn 4633 df-res 4634 df-ima 4635 df-iota 5173 df-fun 5213 df-fn 5214 df-f 5215 df-f1 5216 df-fo 5217 df-f1o 5218 df-fv 5219 df-riota 5824 df-ov 5871 df-oprab 5872 df-mpo 5873 df-1st 6134 df-2nd 6135 df-recs 6299 df-frec 6385 df-sup 6976 df-pnf 7971 df-mnf 7972 df-xr 7973 df-ltxr 7974 df-le 7975 df-sub 8107 df-neg 8108 df-reap 8509 df-ap 8516 df-div 8606 df-inn 8896 df-2 8954 df-3 8955 df-4 8956 df-n0 9153 df-z 9230 df-uz 9505 df-rp 9628 df-seqfrec 10419 df-exp 10493 df-cj 10822 df-re 10823 df-im 10824 df-rsqrt 10978 df-abs 10979 |
This theorem is referenced by: (None) |
Copyright terms: Public domain | W3C validator |