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Theorem efif1olem3 26044

Description: Lemma for efif1o 26046. (Contributed by Mario Carneiro, 8-May-2015.)

**Hypotheses**
Ref	Expression
efif1o.1	⊢ 𝐹 = (𝑤 ∈ 𝐷 ↦ (exp‘(i · 𝑤)))
efif1o.2	⊢ 𝐶 = (^◡abs “ {1})

**Assertion**
Ref	Expression
efif1olem3	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (ℑ‘(√‘𝑥)) ∈ (-1[,]1))

Distinct variable groups: 𝑥,𝑤,𝐶 𝑥,𝐹 𝜑,𝑤,𝑥 𝑤,𝐷,𝑥 Allowed substitution hint: 𝐹(𝑤)

**Proof of Theorem efif1olem3**
Step	Hyp	Ref	Expression
1		simpr 485	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → 𝑥 ∈ 𝐶)
2		efif1o.2	. . . . . . 7 ⊢ 𝐶 = (^◡abs “ {1})
3	1, 2	eleqtrdi 2843	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → 𝑥 ∈ (^◡abs “ {1}))
4		absf 15280	. . . . . . 7 ⊢ abs:ℂ⟶ℝ
5		ffn 6714	. . . . . . 7 ⊢ (abs:ℂ⟶ℝ → abs Fn ℂ)
6		fniniseg 7058	. . . . . . 7 ⊢ (abs Fn ℂ → (𝑥 ∈ (^◡abs “ {1}) ↔ (𝑥 ∈ ℂ ∧ (abs‘𝑥) = 1)))
7	4, 5, 6	mp2b 10	. . . . . 6 ⊢ (𝑥 ∈ (^◡abs “ {1}) ↔ (𝑥 ∈ ℂ ∧ (abs‘𝑥) = 1))
8	3, 7	sylib 217	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (𝑥 ∈ ℂ ∧ (abs‘𝑥) = 1))
9	8	simpld 495	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → 𝑥 ∈ ℂ)
10	9	sqrtcld 15380	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (√‘𝑥) ∈ ℂ)
11	10	imcld 15138	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (ℑ‘(√‘𝑥)) ∈ ℝ)
12		absimle 15252	. . . . . 6 ⊢ ((√‘𝑥) ∈ ℂ → (abs‘(ℑ‘(√‘𝑥))) ≤ (abs‘(√‘𝑥)))
13	10, 12	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘(ℑ‘(√‘𝑥))) ≤ (abs‘(√‘𝑥)))
14	9	sqsqrtd 15382	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → ((√‘𝑥)↑2) = 𝑥)
15	14	fveq2d 6892	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘((√‘𝑥)↑2)) = (abs‘𝑥))
16		2nn0 12485	. . . . . . . . 9 ⊢ 2 ∈ ℕ₀
17		absexp 15247	. . . . . . . . 9 ⊢ (((√‘𝑥) ∈ ℂ ∧ 2 ∈ ℕ₀) → (abs‘((√‘𝑥)↑2)) = ((abs‘(√‘𝑥))↑2))
18	10, 16, 17	sylancl 586	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘((√‘𝑥)↑2)) = ((abs‘(√‘𝑥))↑2))
19	8	simprd 496	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘𝑥) = 1)
20	15, 18, 19	3eqtr3d 2780	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → ((abs‘(√‘𝑥))↑2) = 1)
21		sq1 14155	. . . . . . 7 ⊢ (1↑2) = 1
22	20, 21	eqtr4di 2790	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → ((abs‘(√‘𝑥))↑2) = (1↑2))
23	10	abscld 15379	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘(√‘𝑥)) ∈ ℝ)
24	10	absge0d 15387	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → 0 ≤ (abs‘(√‘𝑥)))
25		1re 11210	. . . . . . . 8 ⊢ 1 ∈ ℝ
26		0le1 11733	. . . . . . . 8 ⊢ 0 ≤ 1
27		sq11 14092	. . . . . . . 8 ⊢ ((((abs‘(√‘𝑥)) ∈ ℝ ∧ 0 ≤ (abs‘(√‘𝑥))) ∧ (1 ∈ ℝ ∧ 0 ≤ 1)) → (((abs‘(√‘𝑥))↑2) = (1↑2) ↔ (abs‘(√‘𝑥)) = 1))
28	25, 26, 27	mpanr12 703	. . . . . . 7 ⊢ (((abs‘(√‘𝑥)) ∈ ℝ ∧ 0 ≤ (abs‘(√‘𝑥))) → (((abs‘(√‘𝑥))↑2) = (1↑2) ↔ (abs‘(√‘𝑥)) = 1))
29	23, 24, 28	syl2anc 584	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (((abs‘(√‘𝑥))↑2) = (1↑2) ↔ (abs‘(√‘𝑥)) = 1))
30	22, 29	mpbid 231	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘(√‘𝑥)) = 1)
31	13, 30	breqtrd 5173	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘(ℑ‘(√‘𝑥))) ≤ 1)
32		absle 15258	. . . . 5 ⊢ (((ℑ‘(√‘𝑥)) ∈ ℝ ∧ 1 ∈ ℝ) → ((abs‘(ℑ‘(√‘𝑥))) ≤ 1 ↔ (-1 ≤ (ℑ‘(√‘𝑥)) ∧ (ℑ‘(√‘𝑥)) ≤ 1)))
33	11, 25, 32	sylancl 586	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → ((abs‘(ℑ‘(√‘𝑥))) ≤ 1 ↔ (-1 ≤ (ℑ‘(√‘𝑥)) ∧ (ℑ‘(√‘𝑥)) ≤ 1)))
34	31, 33	mpbid 231	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (-1 ≤ (ℑ‘(√‘𝑥)) ∧ (ℑ‘(√‘𝑥)) ≤ 1))
35	34	simpld 495	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → -1 ≤ (ℑ‘(√‘𝑥)))
36	34	simprd 496	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (ℑ‘(√‘𝑥)) ≤ 1)
37		neg1rr 12323	. . 3 ⊢ -1 ∈ ℝ
38	37, 25	elicc2i 13386	. 2 ⊢ ((ℑ‘(√‘𝑥)) ∈ (-1[,]1) ↔ ((ℑ‘(√‘𝑥)) ∈ ℝ ∧ -1 ≤ (ℑ‘(√‘𝑥)) ∧ (ℑ‘(√‘𝑥)) ≤ 1))
39	11, 35, 36, 38	syl3anbrc 1343	1 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (ℑ‘(√‘𝑥)) ∈ (-1[,]1))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1541 ∈ wcel 2106 {csn 4627 class class class wbr 5147 ↦ cmpt 5230 ^◡ccnv 5674 “ cima 5678 Fn wfn 6535 ⟶wf 6536 ‘cfv 6540 (class class class)co 7405 ℂcc 11104 ℝcr 11105 0cc0 11106 1c1 11107 ici 11108 · cmul 11111 ≤ cle 11245 -cneg 11441 2c2 12263 ℕ₀cn0 12468 [,]cicc 13323 ↑cexp 14023 ℑcim 15041 √csqrt 15176 abscabs 15177 expce 16001

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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-er 8699 df-en 8936 df-dom 8937 df-sdom 8938 df-sup 9433 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-3 12272 df-n0 12469 df-z 12555 df-uz 12819 df-rp 12971 df-icc 13327 df-seq 13963 df-exp 14024 df-cj 15042 df-re 15043 df-im 15044 df-sqrt 15178 df-abs 15179

This theorem is referenced by: efif1olem4 26045

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