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Mirrors > Home > MPE Home > Th. List > sqeqd | Structured version Visualization version GIF version |
Description: A deduction for showing two numbers whose squares are equal are themselves equal. (Contributed by Mario Carneiro, 3-Apr-2015.) |
Ref | Expression |
---|---|
sqeqd.1 | ⊢ (𝜑 → 𝐴 ∈ ℂ) |
sqeqd.2 | ⊢ (𝜑 → 𝐵 ∈ ℂ) |
sqeqd.3 | ⊢ (𝜑 → (𝐴↑2) = (𝐵↑2)) |
sqeqd.4 | ⊢ (𝜑 → 0 ≤ (ℜ‘𝐴)) |
sqeqd.5 | ⊢ (𝜑 → 0 ≤ (ℜ‘𝐵)) |
sqeqd.6 | ⊢ ((𝜑 ∧ (ℜ‘𝐴) = 0 ∧ (ℜ‘𝐵) = 0) → 𝐴 = 𝐵) |
Ref | Expression |
---|---|
sqeqd | ⊢ (𝜑 → 𝐴 = 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sqeqd.3 | . . . . 5 ⊢ (𝜑 → (𝐴↑2) = (𝐵↑2)) | |
2 | sqeqd.1 | . . . . . 6 ⊢ (𝜑 → 𝐴 ∈ ℂ) | |
3 | sqeqd.2 | . . . . . 6 ⊢ (𝜑 → 𝐵 ∈ ℂ) | |
4 | sqeqor 13581 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((𝐴↑2) = (𝐵↑2) ↔ (𝐴 = 𝐵 ∨ 𝐴 = -𝐵))) | |
5 | 2, 3, 4 | syl2anc 586 | . . . . 5 ⊢ (𝜑 → ((𝐴↑2) = (𝐵↑2) ↔ (𝐴 = 𝐵 ∨ 𝐴 = -𝐵))) |
6 | 1, 5 | mpbid 234 | . . . 4 ⊢ (𝜑 → (𝐴 = 𝐵 ∨ 𝐴 = -𝐵)) |
7 | 6 | ord 860 | . . 3 ⊢ (𝜑 → (¬ 𝐴 = 𝐵 → 𝐴 = -𝐵)) |
8 | simpl 485 | . . . . 5 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → 𝜑) | |
9 | fveq2 6673 | . . . . . . 7 ⊢ (𝐴 = -𝐵 → (ℜ‘𝐴) = (ℜ‘-𝐵)) | |
10 | reneg 14487 | . . . . . . . 8 ⊢ (𝐵 ∈ ℂ → (ℜ‘-𝐵) = -(ℜ‘𝐵)) | |
11 | 3, 10 | syl 17 | . . . . . . 7 ⊢ (𝜑 → (ℜ‘-𝐵) = -(ℜ‘𝐵)) |
12 | 9, 11 | sylan9eqr 2881 | . . . . . 6 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → (ℜ‘𝐴) = -(ℜ‘𝐵)) |
13 | sqeqd.4 | . . . . . . . . . . . 12 ⊢ (𝜑 → 0 ≤ (ℜ‘𝐴)) | |
14 | 13 | adantr 483 | . . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → 0 ≤ (ℜ‘𝐴)) |
15 | 14, 12 | breqtrd 5095 | . . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → 0 ≤ -(ℜ‘𝐵)) |
16 | 3 | adantr 483 | . . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → 𝐵 ∈ ℂ) |
17 | recl 14472 | . . . . . . . . . . . 12 ⊢ (𝐵 ∈ ℂ → (ℜ‘𝐵) ∈ ℝ) | |
18 | 16, 17 | syl 17 | . . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → (ℜ‘𝐵) ∈ ℝ) |
19 | 18 | le0neg1d 11214 | . . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → ((ℜ‘𝐵) ≤ 0 ↔ 0 ≤ -(ℜ‘𝐵))) |
20 | 15, 19 | mpbird 259 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → (ℜ‘𝐵) ≤ 0) |
21 | sqeqd.5 | . . . . . . . . . 10 ⊢ (𝜑 → 0 ≤ (ℜ‘𝐵)) | |
22 | 21 | adantr 483 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → 0 ≤ (ℜ‘𝐵)) |
23 | 0re 10646 | . . . . . . . . . 10 ⊢ 0 ∈ ℝ | |
24 | letri3 10729 | . . . . . . . . . 10 ⊢ (((ℜ‘𝐵) ∈ ℝ ∧ 0 ∈ ℝ) → ((ℜ‘𝐵) = 0 ↔ ((ℜ‘𝐵) ≤ 0 ∧ 0 ≤ (ℜ‘𝐵)))) | |
25 | 18, 23, 24 | sylancl 588 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → ((ℜ‘𝐵) = 0 ↔ ((ℜ‘𝐵) ≤ 0 ∧ 0 ≤ (ℜ‘𝐵)))) |
26 | 20, 22, 25 | mpbir2and 711 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → (ℜ‘𝐵) = 0) |
27 | 26 | negeqd 10883 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → -(ℜ‘𝐵) = -0) |
28 | neg0 10935 | . . . . . . 7 ⊢ -0 = 0 | |
29 | 27, 28 | syl6eq 2875 | . . . . . 6 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → -(ℜ‘𝐵) = 0) |
30 | 12, 29 | eqtrd 2859 | . . . . 5 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → (ℜ‘𝐴) = 0) |
31 | sqeqd.6 | . . . . 5 ⊢ ((𝜑 ∧ (ℜ‘𝐴) = 0 ∧ (ℜ‘𝐵) = 0) → 𝐴 = 𝐵) | |
32 | 8, 30, 26, 31 | syl3anc 1367 | . . . 4 ⊢ ((𝜑 ∧ 𝐴 = -𝐵) → 𝐴 = 𝐵) |
33 | 32 | ex 415 | . . 3 ⊢ (𝜑 → (𝐴 = -𝐵 → 𝐴 = 𝐵)) |
34 | 7, 33 | syld 47 | . 2 ⊢ (𝜑 → (¬ 𝐴 = 𝐵 → 𝐴 = 𝐵)) |
35 | 34 | pm2.18d 127 | 1 ⊢ (𝜑 → 𝐴 = 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 ∧ wa 398 ∨ wo 843 ∧ w3a 1083 = wceq 1536 ∈ wcel 2113 class class class wbr 5069 ‘cfv 6358 (class class class)co 7159 ℂcc 10538 ℝcr 10539 0cc0 10540 ≤ cle 10679 -cneg 10874 2c2 11695 ↑cexp 13432 ℜcre 14459 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 ax-sep 5206 ax-nul 5213 ax-pow 5269 ax-pr 5333 ax-un 7464 ax-cnex 10596 ax-resscn 10597 ax-1cn 10598 ax-icn 10599 ax-addcl 10600 ax-addrcl 10601 ax-mulcl 10602 ax-mulrcl 10603 ax-mulcom 10604 ax-addass 10605 ax-mulass 10606 ax-distr 10607 ax-i2m1 10608 ax-1ne0 10609 ax-1rid 10610 ax-rnegex 10611 ax-rrecex 10612 ax-cnre 10613 ax-pre-lttri 10614 ax-pre-lttrn 10615 ax-pre-ltadd 10616 ax-pre-mulgt0 10617 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-ne 3020 df-nel 3127 df-ral 3146 df-rex 3147 df-reu 3148 df-rmo 3149 df-rab 3150 df-v 3499 df-sbc 3776 df-csb 3887 df-dif 3942 df-un 3944 df-in 3946 df-ss 3955 df-pss 3957 df-nul 4295 df-if 4471 df-pw 4544 df-sn 4571 df-pr 4573 df-tp 4575 df-op 4577 df-uni 4842 df-iun 4924 df-br 5070 df-opab 5132 df-mpt 5150 df-tr 5176 df-id 5463 df-eprel 5468 df-po 5477 df-so 5478 df-fr 5517 df-we 5519 df-xp 5564 df-rel 5565 df-cnv 5566 df-co 5567 df-dm 5568 df-rn 5569 df-res 5570 df-ima 5571 df-pred 6151 df-ord 6197 df-on 6198 df-lim 6199 df-suc 6200 df-iota 6317 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-riota 7117 df-ov 7162 df-oprab 7163 df-mpo 7164 df-om 7584 df-2nd 7693 df-wrecs 7950 df-recs 8011 df-rdg 8049 df-er 8292 df-en 8513 df-dom 8514 df-sdom 8515 df-pnf 10680 df-mnf 10681 df-xr 10682 df-ltxr 10683 df-le 10684 df-sub 10875 df-neg 10876 df-div 11301 df-nn 11642 df-2 11703 df-n0 11901 df-z 11985 df-uz 12247 df-seq 13373 df-exp 13433 df-cj 14461 df-re 14462 df-im 14463 |
This theorem is referenced by: (None) |
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