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Mirrors > Home > HSE Home > Th. List > normpythi | Structured version Visualization version GIF version |
Description: Analogy to Pythagorean theorem for orthogonal vectors. Remark 3.4(C) of [Beran] p. 98. (Contributed by NM, 17-Oct-1999.) (New usage is discouraged.) |
Ref | Expression |
---|---|
normsub.1 | ⊢ 𝐴 ∈ ℋ |
normsub.2 | ⊢ 𝐵 ∈ ℋ |
Ref | Expression |
---|---|
normpythi | ⊢ ((𝐴 ·ih 𝐵) = 0 → ((normℎ‘(𝐴 +ℎ 𝐵))↑2) = (((normℎ‘𝐴)↑2) + ((normℎ‘𝐵)↑2))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | normsub.1 | . . . 4 ⊢ 𝐴 ∈ ℋ | |
2 | normsub.2 | . . . 4 ⊢ 𝐵 ∈ ℋ | |
3 | 1, 2, 1, 2 | normlem8 28821 | . . 3 ⊢ ((𝐴 +ℎ 𝐵) ·ih (𝐴 +ℎ 𝐵)) = (((𝐴 ·ih 𝐴) + (𝐵 ·ih 𝐵)) + ((𝐴 ·ih 𝐵) + (𝐵 ·ih 𝐴))) |
4 | id 22 | . . . . . . 7 ⊢ ((𝐴 ·ih 𝐵) = 0 → (𝐴 ·ih 𝐵) = 0) | |
5 | orthcom 28812 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℋ ∧ 𝐵 ∈ ℋ) → ((𝐴 ·ih 𝐵) = 0 ↔ (𝐵 ·ih 𝐴) = 0)) | |
6 | 1, 2, 5 | mp2an 688 | . . . . . . . 8 ⊢ ((𝐴 ·ih 𝐵) = 0 ↔ (𝐵 ·ih 𝐴) = 0) |
7 | 6 | biimpi 217 | . . . . . . 7 ⊢ ((𝐴 ·ih 𝐵) = 0 → (𝐵 ·ih 𝐴) = 0) |
8 | 4, 7 | oveq12d 7163 | . . . . . 6 ⊢ ((𝐴 ·ih 𝐵) = 0 → ((𝐴 ·ih 𝐵) + (𝐵 ·ih 𝐴)) = (0 + 0)) |
9 | 00id 10803 | . . . . . 6 ⊢ (0 + 0) = 0 | |
10 | 8, 9 | syl6eq 2869 | . . . . 5 ⊢ ((𝐴 ·ih 𝐵) = 0 → ((𝐴 ·ih 𝐵) + (𝐵 ·ih 𝐴)) = 0) |
11 | 10 | oveq2d 7161 | . . . 4 ⊢ ((𝐴 ·ih 𝐵) = 0 → (((𝐴 ·ih 𝐴) + (𝐵 ·ih 𝐵)) + ((𝐴 ·ih 𝐵) + (𝐵 ·ih 𝐴))) = (((𝐴 ·ih 𝐴) + (𝐵 ·ih 𝐵)) + 0)) |
12 | 1, 1 | hicli 28785 | . . . . . 6 ⊢ (𝐴 ·ih 𝐴) ∈ ℂ |
13 | 2, 2 | hicli 28785 | . . . . . 6 ⊢ (𝐵 ·ih 𝐵) ∈ ℂ |
14 | 12, 13 | addcli 10635 | . . . . 5 ⊢ ((𝐴 ·ih 𝐴) + (𝐵 ·ih 𝐵)) ∈ ℂ |
15 | 14 | addid1i 10815 | . . . 4 ⊢ (((𝐴 ·ih 𝐴) + (𝐵 ·ih 𝐵)) + 0) = ((𝐴 ·ih 𝐴) + (𝐵 ·ih 𝐵)) |
16 | 11, 15 | syl6eq 2869 | . . 3 ⊢ ((𝐴 ·ih 𝐵) = 0 → (((𝐴 ·ih 𝐴) + (𝐵 ·ih 𝐵)) + ((𝐴 ·ih 𝐵) + (𝐵 ·ih 𝐴))) = ((𝐴 ·ih 𝐴) + (𝐵 ·ih 𝐵))) |
17 | 3, 16 | syl5eq 2865 | . 2 ⊢ ((𝐴 ·ih 𝐵) = 0 → ((𝐴 +ℎ 𝐵) ·ih (𝐴 +ℎ 𝐵)) = ((𝐴 ·ih 𝐴) + (𝐵 ·ih 𝐵))) |
18 | 1, 2 | hvaddcli 28722 | . . 3 ⊢ (𝐴 +ℎ 𝐵) ∈ ℋ |
19 | 18 | normsqi 28836 | . 2 ⊢ ((normℎ‘(𝐴 +ℎ 𝐵))↑2) = ((𝐴 +ℎ 𝐵) ·ih (𝐴 +ℎ 𝐵)) |
20 | 1 | normsqi 28836 | . . 3 ⊢ ((normℎ‘𝐴)↑2) = (𝐴 ·ih 𝐴) |
21 | 2 | normsqi 28836 | . . 3 ⊢ ((normℎ‘𝐵)↑2) = (𝐵 ·ih 𝐵) |
22 | 20, 21 | oveq12i 7157 | . 2 ⊢ (((normℎ‘𝐴)↑2) + ((normℎ‘𝐵)↑2)) = ((𝐴 ·ih 𝐴) + (𝐵 ·ih 𝐵)) |
23 | 17, 19, 22 | 3eqtr4g 2878 | 1 ⊢ ((𝐴 ·ih 𝐵) = 0 → ((normℎ‘(𝐴 +ℎ 𝐵))↑2) = (((normℎ‘𝐴)↑2) + ((normℎ‘𝐵)↑2))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 207 = wceq 1528 ∈ wcel 2105 ‘cfv 6348 (class class class)co 7145 0cc0 10525 + caddc 10528 2c2 11680 ↑cexp 13417 ℋchba 28623 +ℎ cva 28624 ·ih csp 28626 normℎcno 28627 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1787 ax-4 1801 ax-5 1902 ax-6 1961 ax-7 2006 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2151 ax-12 2167 ax-ext 2790 ax-sep 5194 ax-nul 5201 ax-pow 5257 ax-pr 5320 ax-un 7450 ax-cnex 10581 ax-resscn 10582 ax-1cn 10583 ax-icn 10584 ax-addcl 10585 ax-addrcl 10586 ax-mulcl 10587 ax-mulrcl 10588 ax-mulcom 10589 ax-addass 10590 ax-mulass 10591 ax-distr 10592 ax-i2m1 10593 ax-1ne0 10594 ax-1rid 10595 ax-rnegex 10596 ax-rrecex 10597 ax-cnre 10598 ax-pre-lttri 10599 ax-pre-lttrn 10600 ax-pre-ltadd 10601 ax-pre-mulgt0 10602 ax-pre-sup 10603 ax-hfvadd 28704 ax-hv0cl 28707 ax-hvmul0 28714 ax-hfi 28783 ax-his1 28786 ax-his2 28787 ax-his3 28788 ax-his4 28789 |
This theorem depends on definitions: df-bi 208 df-an 397 df-or 842 df-3or 1080 df-3an 1081 df-tru 1531 df-ex 1772 df-nf 1776 df-sb 2061 df-mo 2615 df-eu 2647 df-clab 2797 df-cleq 2811 df-clel 2890 df-nfc 2960 df-ne 3014 df-nel 3121 df-ral 3140 df-rex 3141 df-reu 3142 df-rmo 3143 df-rab 3144 df-v 3494 df-sbc 3770 df-csb 3881 df-dif 3936 df-un 3938 df-in 3940 df-ss 3949 df-pss 3951 df-nul 4289 df-if 4464 df-pw 4537 df-sn 4558 df-pr 4560 df-tp 4562 df-op 4564 df-uni 4831 df-iun 4912 df-br 5058 df-opab 5120 df-mpt 5138 df-tr 5164 df-id 5453 df-eprel 5458 df-po 5467 df-so 5468 df-fr 5507 df-we 5509 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-pred 6141 df-ord 6187 df-on 6188 df-lim 6189 df-suc 6190 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-riota 7103 df-ov 7148 df-oprab 7149 df-mpo 7150 df-om 7570 df-2nd 7679 df-wrecs 7936 df-recs 7997 df-rdg 8035 df-er 8278 df-en 8498 df-dom 8499 df-sdom 8500 df-sup 8894 df-pnf 10665 df-mnf 10666 df-xr 10667 df-ltxr 10668 df-le 10669 df-sub 10860 df-neg 10861 df-div 11286 df-nn 11627 df-2 11688 df-3 11689 df-n0 11886 df-z 11970 df-uz 12232 df-rp 12378 df-seq 13358 df-exp 13418 df-cj 14446 df-re 14447 df-im 14448 df-sqrt 14582 df-hnorm 28672 |
This theorem is referenced by: normpyth 28849 pjopythi 29423 |
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