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Theorem efif1olem3 26433

Description: Lemma for efif1o 26435. (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 484	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → 𝑥 ∈ 𝐶)
2		efif1o.2	. . . . . . 7 ⊢ 𝐶 = (^◡abs “ {1})
3	1, 2	eleqtrdi 2837	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → 𝑥 ∈ (^◡abs “ {1}))
4		absf 15290	. . . . . . 7 ⊢ abs:ℂ⟶ℝ
5		ffn 6711	. . . . . . 7 ⊢ (abs:ℂ⟶ℝ → abs Fn ℂ)
6		fniniseg 7055	. . . . . . 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 494	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → 𝑥 ∈ ℂ)
10	9	sqrtcld 15390	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (√‘𝑥) ∈ ℂ)
11	10	imcld 15148	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (ℑ‘(√‘𝑥)) ∈ ℝ)
12		absimle 15262	. . . . . 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 15392	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → ((√‘𝑥)↑2) = 𝑥)
15	14	fveq2d 6889	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘((√‘𝑥)↑2)) = (abs‘𝑥))
16		2nn0 12493	. . . . . . . . 9 ⊢ 2 ∈ ℕ₀
17		absexp 15257	. . . . . . . . 9 ⊢ (((√‘𝑥) ∈ ℂ ∧ 2 ∈ ℕ₀) → (abs‘((√‘𝑥)↑2)) = ((abs‘(√‘𝑥))↑2))
18	10, 16, 17	sylancl 585	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘((√‘𝑥)↑2)) = ((abs‘(√‘𝑥))↑2))
19	8	simprd 495	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘𝑥) = 1)
20	15, 18, 19	3eqtr3d 2774	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → ((abs‘(√‘𝑥))↑2) = 1)
21		sq1 14164	. . . . . . 7 ⊢ (1↑2) = 1
22	20, 21	eqtr4di 2784	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → ((abs‘(√‘𝑥))↑2) = (1↑2))
23	10	abscld 15389	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘(√‘𝑥)) ∈ ℝ)
24	10	absge0d 15397	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → 0 ≤ (abs‘(√‘𝑥)))
25		1re 11218	. . . . . . . 8 ⊢ 1 ∈ ℝ
26		0le1 11741	. . . . . . . 8 ⊢ 0 ≤ 1
27		sq11 14101	. . . . . . . 8 ⊢ ((((abs‘(√‘𝑥)) ∈ ℝ ∧ 0 ≤ (abs‘(√‘𝑥))) ∧ (1 ∈ ℝ ∧ 0 ≤ 1)) → (((abs‘(√‘𝑥))↑2) = (1↑2) ↔ (abs‘(√‘𝑥)) = 1))
28	25, 26, 27	mpanr12 702	. . . . . . 7 ⊢ (((abs‘(√‘𝑥)) ∈ ℝ ∧ 0 ≤ (abs‘(√‘𝑥))) → (((abs‘(√‘𝑥))↑2) = (1↑2) ↔ (abs‘(√‘𝑥)) = 1))
29	23, 24, 28	syl2anc 583	. . . . . 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 5167	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (abs‘(ℑ‘(√‘𝑥))) ≤ 1)
32		absle 15268	. . . . 5 ⊢ (((ℑ‘(√‘𝑥)) ∈ ℝ ∧ 1 ∈ ℝ) → ((abs‘(ℑ‘(√‘𝑥))) ≤ 1 ↔ (-1 ≤ (ℑ‘(√‘𝑥)) ∧ (ℑ‘(√‘𝑥)) ≤ 1)))
33	11, 25, 32	sylancl 585	. . . 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 494	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → -1 ≤ (ℑ‘(√‘𝑥)))
36	34	simprd 495	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (ℑ‘(√‘𝑥)) ≤ 1)
37		neg1rr 12331	. . 3 ⊢ -1 ∈ ℝ
38	37, 25	elicc2i 13396	. 2 ⊢ ((ℑ‘(√‘𝑥)) ∈ (-1[,]1) ↔ ((ℑ‘(√‘𝑥)) ∈ ℝ ∧ -1 ≤ (ℑ‘(√‘𝑥)) ∧ (ℑ‘(√‘𝑥)) ≤ 1))
39	11, 35, 36, 38	syl3anbrc 1340	1 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐶) → (ℑ‘(√‘𝑥)) ∈ (-1[,]1))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1533 ∈ wcel 2098 {csn 4623 class class class wbr 5141 ↦ cmpt 5224 ^◡ccnv 5668 “ cima 5672 Fn wfn 6532 ⟶wf 6533 ‘cfv 6537 (class class class)co 7405 ℂcc 11110 ℝcr 11111 0cc0 11112 1c1 11113 ici 11114 · cmul 11117 ≤ cle 11253 -cneg 11449 2c2 12271 ℕ₀cn0 12476 [,]cicc 13333 ↑cexp 14032 ℑcim 15051 √csqrt 15186 abscabs 15187 expce 16011

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7722 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 ax-pre-sup 11190

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-nel 3041 df-ral 3056 df-rex 3065 df-rmo 3370 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-pss 3962 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-iun 4992 df-br 5142 df-opab 5204 df-mpt 5225 df-tr 5259 df-id 5567 df-eprel 5573 df-po 5581 df-so 5582 df-fr 5624 df-we 5626 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-pred 6294 df-ord 6361 df-on 6362 df-lim 6363 df-suc 6364 df-iota 6489 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7853 df-2nd 7975 df-frecs 8267 df-wrecs 8298 df-recs 8372 df-rdg 8411 df-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 df-sup 9439 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-div 11876 df-nn 12217 df-2 12279 df-3 12280 df-n0 12477 df-z 12563 df-uz 12827 df-rp 12981 df-icc 13337 df-seq 13973 df-exp 14033 df-cj 15052 df-re 15053 df-im 15054 df-sqrt 15188 df-abs 15189

This theorem is referenced by: efif1olem4 26434

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