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Mirrors > Home > MPE Home > Th. List > eqsqrtd | Structured version Visualization version GIF version |
Description: A deduction for showing that a number equals the square root of another. (Contributed by Mario Carneiro, 3-Apr-2015.) |
Ref | Expression |
---|---|
eqsqrtd.1 | ⊢ (𝜑 → 𝐴 ∈ ℂ) |
eqsqrtd.2 | ⊢ (𝜑 → 𝐵 ∈ ℂ) |
eqsqrtd.3 | ⊢ (𝜑 → (𝐴↑2) = 𝐵) |
eqsqrtd.4 | ⊢ (𝜑 → 0 ≤ (ℜ‘𝐴)) |
eqsqrtd.5 | ⊢ (𝜑 → ¬ (i · 𝐴) ∈ ℝ+) |
Ref | Expression |
---|---|
eqsqrtd | ⊢ (𝜑 → 𝐴 = (√‘𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqsqrtd.2 | . . 3 ⊢ (𝜑 → 𝐵 ∈ ℂ) | |
2 | sqreu 14100 | . . 3 ⊢ (𝐵 ∈ ℂ → ∃!𝑥 ∈ ℂ ((𝑥↑2) = 𝐵 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+)) | |
3 | reurmo 3161 | . . 3 ⊢ (∃!𝑥 ∈ ℂ ((𝑥↑2) = 𝐵 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+) → ∃*𝑥 ∈ ℂ ((𝑥↑2) = 𝐵 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+)) | |
4 | 1, 2, 3 | 3syl 18 | . 2 ⊢ (𝜑 → ∃*𝑥 ∈ ℂ ((𝑥↑2) = 𝐵 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+)) |
5 | eqsqrtd.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ ℂ) | |
6 | eqsqrtd.3 | . . 3 ⊢ (𝜑 → (𝐴↑2) = 𝐵) | |
7 | eqsqrtd.4 | . . 3 ⊢ (𝜑 → 0 ≤ (ℜ‘𝐴)) | |
8 | eqsqrtd.5 | . . . 4 ⊢ (𝜑 → ¬ (i · 𝐴) ∈ ℝ+) | |
9 | df-nel 2898 | . . . 4 ⊢ ((i · 𝐴) ∉ ℝ+ ↔ ¬ (i · 𝐴) ∈ ℝ+) | |
10 | 8, 9 | sylibr 224 | . . 3 ⊢ (𝜑 → (i · 𝐴) ∉ ℝ+) |
11 | 6, 7, 10 | 3jca 1242 | . 2 ⊢ (𝜑 → ((𝐴↑2) = 𝐵 ∧ 0 ≤ (ℜ‘𝐴) ∧ (i · 𝐴) ∉ ℝ+)) |
12 | sqrtcl 14101 | . . 3 ⊢ (𝐵 ∈ ℂ → (√‘𝐵) ∈ ℂ) | |
13 | 1, 12 | syl 17 | . 2 ⊢ (𝜑 → (√‘𝐵) ∈ ℂ) |
14 | sqrtthlem 14102 | . . 3 ⊢ (𝐵 ∈ ℂ → (((√‘𝐵)↑2) = 𝐵 ∧ 0 ≤ (ℜ‘(√‘𝐵)) ∧ (i · (√‘𝐵)) ∉ ℝ+)) | |
15 | 1, 14 | syl 17 | . 2 ⊢ (𝜑 → (((√‘𝐵)↑2) = 𝐵 ∧ 0 ≤ (ℜ‘(√‘𝐵)) ∧ (i · (√‘𝐵)) ∉ ℝ+)) |
16 | oveq1 6657 | . . . . 5 ⊢ (𝑥 = 𝐴 → (𝑥↑2) = (𝐴↑2)) | |
17 | 16 | eqeq1d 2624 | . . . 4 ⊢ (𝑥 = 𝐴 → ((𝑥↑2) = 𝐵 ↔ (𝐴↑2) = 𝐵)) |
18 | fveq2 6191 | . . . . 5 ⊢ (𝑥 = 𝐴 → (ℜ‘𝑥) = (ℜ‘𝐴)) | |
19 | 18 | breq2d 4665 | . . . 4 ⊢ (𝑥 = 𝐴 → (0 ≤ (ℜ‘𝑥) ↔ 0 ≤ (ℜ‘𝐴))) |
20 | oveq2 6658 | . . . . 5 ⊢ (𝑥 = 𝐴 → (i · 𝑥) = (i · 𝐴)) | |
21 | neleq1 2902 | . . . . 5 ⊢ ((i · 𝑥) = (i · 𝐴) → ((i · 𝑥) ∉ ℝ+ ↔ (i · 𝐴) ∉ ℝ+)) | |
22 | 20, 21 | syl 17 | . . . 4 ⊢ (𝑥 = 𝐴 → ((i · 𝑥) ∉ ℝ+ ↔ (i · 𝐴) ∉ ℝ+)) |
23 | 17, 19, 22 | 3anbi123d 1399 | . . 3 ⊢ (𝑥 = 𝐴 → (((𝑥↑2) = 𝐵 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+) ↔ ((𝐴↑2) = 𝐵 ∧ 0 ≤ (ℜ‘𝐴) ∧ (i · 𝐴) ∉ ℝ+))) |
24 | oveq1 6657 | . . . . 5 ⊢ (𝑥 = (√‘𝐵) → (𝑥↑2) = ((√‘𝐵)↑2)) | |
25 | 24 | eqeq1d 2624 | . . . 4 ⊢ (𝑥 = (√‘𝐵) → ((𝑥↑2) = 𝐵 ↔ ((√‘𝐵)↑2) = 𝐵)) |
26 | fveq2 6191 | . . . . 5 ⊢ (𝑥 = (√‘𝐵) → (ℜ‘𝑥) = (ℜ‘(√‘𝐵))) | |
27 | 26 | breq2d 4665 | . . . 4 ⊢ (𝑥 = (√‘𝐵) → (0 ≤ (ℜ‘𝑥) ↔ 0 ≤ (ℜ‘(√‘𝐵)))) |
28 | oveq2 6658 | . . . . 5 ⊢ (𝑥 = (√‘𝐵) → (i · 𝑥) = (i · (√‘𝐵))) | |
29 | neleq1 2902 | . . . . 5 ⊢ ((i · 𝑥) = (i · (√‘𝐵)) → ((i · 𝑥) ∉ ℝ+ ↔ (i · (√‘𝐵)) ∉ ℝ+)) | |
30 | 28, 29 | syl 17 | . . . 4 ⊢ (𝑥 = (√‘𝐵) → ((i · 𝑥) ∉ ℝ+ ↔ (i · (√‘𝐵)) ∉ ℝ+)) |
31 | 25, 27, 30 | 3anbi123d 1399 | . . 3 ⊢ (𝑥 = (√‘𝐵) → (((𝑥↑2) = 𝐵 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+) ↔ (((√‘𝐵)↑2) = 𝐵 ∧ 0 ≤ (ℜ‘(√‘𝐵)) ∧ (i · (√‘𝐵)) ∉ ℝ+))) |
32 | 23, 31 | rmoi 3530 | . 2 ⊢ ((∃*𝑥 ∈ ℂ ((𝑥↑2) = 𝐵 ∧ 0 ≤ (ℜ‘𝑥) ∧ (i · 𝑥) ∉ ℝ+) ∧ (𝐴 ∈ ℂ ∧ ((𝐴↑2) = 𝐵 ∧ 0 ≤ (ℜ‘𝐴) ∧ (i · 𝐴) ∉ ℝ+)) ∧ ((√‘𝐵) ∈ ℂ ∧ (((√‘𝐵)↑2) = 𝐵 ∧ 0 ≤ (ℜ‘(√‘𝐵)) ∧ (i · (√‘𝐵)) ∉ ℝ+))) → 𝐴 = (√‘𝐵)) |
33 | 4, 5, 11, 13, 15, 32 | syl122anc 1335 | 1 ⊢ (𝜑 → 𝐴 = (√‘𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 196 ∧ w3a 1037 = wceq 1483 ∈ wcel 1990 ∉ wnel 2897 ∃!wreu 2914 ∃*wrmo 2915 class class class wbr 4653 ‘cfv 5888 (class class class)co 6650 ℂcc 9934 0cc0 9936 ici 9938 · cmul 9941 ≤ cle 10075 2c2 11070 ℝ+crp 11832 ↑cexp 12860 ℜcre 13837 √csqrt 13973 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-cnex 9992 ax-resscn 9993 ax-1cn 9994 ax-icn 9995 ax-addcl 9996 ax-addrcl 9997 ax-mulcl 9998 ax-mulrcl 9999 ax-mulcom 10000 ax-addass 10001 ax-mulass 10002 ax-distr 10003 ax-i2m1 10004 ax-1ne0 10005 ax-1rid 10006 ax-rnegex 10007 ax-rrecex 10008 ax-cnre 10009 ax-pre-lttri 10010 ax-pre-lttrn 10011 ax-pre-ltadd 10012 ax-pre-mulgt0 10013 ax-pre-sup 10014 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rmo 2920 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-2nd 7169 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-er 7742 df-en 7956 df-dom 7957 df-sdom 7958 df-sup 8348 df-pnf 10076 df-mnf 10077 df-xr 10078 df-ltxr 10079 df-le 10080 df-sub 10268 df-neg 10269 df-div 10685 df-nn 11021 df-2 11079 df-3 11080 df-n0 11293 df-z 11378 df-uz 11688 df-rp 11833 df-seq 12802 df-exp 12861 df-cj 13839 df-re 13840 df-im 13841 df-sqrt 13975 df-abs 13976 |
This theorem is referenced by: eqsqrt2d 14108 cphsqrtcl2 22986 |
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