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Mirrors > Home > MPE Home > Th. List > bndatandm | Structured version Visualization version GIF version |
Description: A point in the open unit disk is in the domain of the arctangent. (Contributed by Mario Carneiro, 5-Apr-2015.) |
Ref | Expression |
---|---|
bndatandm | ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → 𝐴 ∈ dom arctan) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpl 486 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → 𝐴 ∈ ℂ) | |
2 | sqcl 13480 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → (𝐴↑2) ∈ ℂ) | |
3 | 2 | adantr 484 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → (𝐴↑2) ∈ ℂ) |
4 | 3 | abscld 14788 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → (abs‘(𝐴↑2)) ∈ ℝ) |
5 | 2nn0 11902 | . . . . . 6 ⊢ 2 ∈ ℕ0 | |
6 | absexp 14656 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 2 ∈ ℕ0) → (abs‘(𝐴↑2)) = ((abs‘𝐴)↑2)) | |
7 | 1, 5, 6 | sylancl 589 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → (abs‘(𝐴↑2)) = ((abs‘𝐴)↑2)) |
8 | simpr 488 | . . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → (abs‘𝐴) < 1) | |
9 | abscl 14630 | . . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → (abs‘𝐴) ∈ ℝ) | |
10 | 9 | adantr 484 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → (abs‘𝐴) ∈ ℝ) |
11 | 1red 10631 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → 1 ∈ ℝ) | |
12 | absge0 14639 | . . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → 0 ≤ (abs‘𝐴)) | |
13 | 12 | adantr 484 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → 0 ≤ (abs‘𝐴)) |
14 | 0le1 11152 | . . . . . . . . 9 ⊢ 0 ≤ 1 | |
15 | 14 | a1i 11 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → 0 ≤ 1) |
16 | 10, 11, 13, 15 | lt2sqd 13615 | . . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → ((abs‘𝐴) < 1 ↔ ((abs‘𝐴)↑2) < (1↑2))) |
17 | 8, 16 | mpbid 235 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → ((abs‘𝐴)↑2) < (1↑2)) |
18 | sq1 13554 | . . . . . 6 ⊢ (1↑2) = 1 | |
19 | 17, 18 | breqtrdi 5071 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → ((abs‘𝐴)↑2) < 1) |
20 | 7, 19 | eqbrtrd 5052 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → (abs‘(𝐴↑2)) < 1) |
21 | 4, 20 | ltned 10765 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → (abs‘(𝐴↑2)) ≠ 1) |
22 | fveq2 6645 | . . . . 5 ⊢ ((𝐴↑2) = -1 → (abs‘(𝐴↑2)) = (abs‘-1)) | |
23 | ax-1cn 10584 | . . . . . . 7 ⊢ 1 ∈ ℂ | |
24 | 23 | absnegi 14752 | . . . . . 6 ⊢ (abs‘-1) = (abs‘1) |
25 | abs1 14649 | . . . . . 6 ⊢ (abs‘1) = 1 | |
26 | 24, 25 | eqtri 2821 | . . . . 5 ⊢ (abs‘-1) = 1 |
27 | 22, 26 | eqtrdi 2849 | . . . 4 ⊢ ((𝐴↑2) = -1 → (abs‘(𝐴↑2)) = 1) |
28 | 27 | necon3i 3019 | . . 3 ⊢ ((abs‘(𝐴↑2)) ≠ 1 → (𝐴↑2) ≠ -1) |
29 | 21, 28 | syl 17 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → (𝐴↑2) ≠ -1) |
30 | atandm3 25464 | . 2 ⊢ (𝐴 ∈ dom arctan ↔ (𝐴 ∈ ℂ ∧ (𝐴↑2) ≠ -1)) | |
31 | 1, 29, 30 | sylanbrc 586 | 1 ⊢ ((𝐴 ∈ ℂ ∧ (abs‘𝐴) < 1) → 𝐴 ∈ dom arctan) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 = wceq 1538 ∈ wcel 2111 ≠ wne 2987 class class class wbr 5030 dom cdm 5519 ‘cfv 6324 (class class class)co 7135 ℂcc 10524 ℝcr 10525 0cc0 10526 1c1 10527 < clt 10664 ≤ cle 10665 -cneg 10860 2c2 11680 ℕ0cn0 11885 ↑cexp 13425 abscabs 14585 arctancatan 25450 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 ax-cnex 10582 ax-resscn 10583 ax-1cn 10584 ax-icn 10585 ax-addcl 10586 ax-addrcl 10587 ax-mulcl 10588 ax-mulrcl 10589 ax-mulcom 10590 ax-addass 10591 ax-mulass 10592 ax-distr 10593 ax-i2m1 10594 ax-1ne0 10595 ax-1rid 10596 ax-rnegex 10597 ax-rrecex 10598 ax-cnre 10599 ax-pre-lttri 10600 ax-pre-lttrn 10601 ax-pre-ltadd 10602 ax-pre-mulgt0 10603 ax-pre-sup 10604 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-nel 3092 df-ral 3111 df-rex 3112 df-reu 3113 df-rmo 3114 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-pred 6116 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-riota 7093 df-ov 7138 df-oprab 7139 df-mpo 7140 df-om 7561 df-2nd 7672 df-wrecs 7930 df-recs 7991 df-rdg 8029 df-er 8272 df-en 8493 df-dom 8494 df-sdom 8495 df-sup 8890 df-pnf 10666 df-mnf 10667 df-xr 10668 df-ltxr 10669 df-le 10670 df-sub 10861 df-neg 10862 df-div 11287 df-nn 11626 df-2 11688 df-3 11689 df-n0 11886 df-z 11970 df-uz 12232 df-rp 12378 df-seq 13365 df-exp 13426 df-cj 14450 df-re 14451 df-im 14452 df-sqrt 14586 df-abs 14587 df-atan 25453 |
This theorem is referenced by: atantayl 25523 log2cnv 25530 |
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