Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > pythi | Structured version Visualization version GIF version |
Description: The Pythagorean theorem for an arbitrary complex inner product (pre-Hilbert) space 𝑈. The square of the norm of the sum of two orthogonal vectors (i.e. whose inner product is 0) is the sum of the squares of their norms. Problem 2 in [Kreyszig] p. 135. This is Metamath 100 proof #4. (Contributed by NM, 17-Apr-2008.) (New usage is discouraged.) |
Ref | Expression |
---|---|
pyth.1 | ⊢ 𝑋 = (BaseSet‘𝑈) |
pyth.2 | ⊢ 𝐺 = ( +𝑣 ‘𝑈) |
pyth.6 | ⊢ 𝑁 = (normCV‘𝑈) |
pyth.7 | ⊢ 𝑃 = (·𝑖OLD‘𝑈) |
pythi.u | ⊢ 𝑈 ∈ CPreHilOLD |
pythi.a | ⊢ 𝐴 ∈ 𝑋 |
pythi.b | ⊢ 𝐵 ∈ 𝑋 |
Ref | Expression |
---|---|
pythi | ⊢ ((𝐴𝑃𝐵) = 0 → ((𝑁‘(𝐴𝐺𝐵))↑2) = (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pyth.1 | . . . 4 ⊢ 𝑋 = (BaseSet‘𝑈) | |
2 | pyth.2 | . . . 4 ⊢ 𝐺 = ( +𝑣 ‘𝑈) | |
3 | pyth.7 | . . . 4 ⊢ 𝑃 = (·𝑖OLD‘𝑈) | |
4 | pythi.u | . . . 4 ⊢ 𝑈 ∈ CPreHilOLD | |
5 | pythi.a | . . . 4 ⊢ 𝐴 ∈ 𝑋 | |
6 | pythi.b | . . . 4 ⊢ 𝐵 ∈ 𝑋 | |
7 | 1, 2, 3, 4, 5, 6, 5, 6 | ip2dii 27699 | . . 3 ⊢ ((𝐴𝐺𝐵)𝑃(𝐴𝐺𝐵)) = (((𝐴𝑃𝐴) + (𝐵𝑃𝐵)) + ((𝐴𝑃𝐵) + (𝐵𝑃𝐴))) |
8 | id 22 | . . . . . . 7 ⊢ ((𝐴𝑃𝐵) = 0 → (𝐴𝑃𝐵) = 0) | |
9 | 4 | phnvi 27671 | . . . . . . . . 9 ⊢ 𝑈 ∈ NrmCVec |
10 | 1, 3 | diporthcom 27571 | . . . . . . . . 9 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋) → ((𝐴𝑃𝐵) = 0 ↔ (𝐵𝑃𝐴) = 0)) |
11 | 9, 5, 6, 10 | mp3an 1424 | . . . . . . . 8 ⊢ ((𝐴𝑃𝐵) = 0 ↔ (𝐵𝑃𝐴) = 0) |
12 | 11 | biimpi 206 | . . . . . . 7 ⊢ ((𝐴𝑃𝐵) = 0 → (𝐵𝑃𝐴) = 0) |
13 | 8, 12 | oveq12d 6668 | . . . . . 6 ⊢ ((𝐴𝑃𝐵) = 0 → ((𝐴𝑃𝐵) + (𝐵𝑃𝐴)) = (0 + 0)) |
14 | 00id 10211 | . . . . . 6 ⊢ (0 + 0) = 0 | |
15 | 13, 14 | syl6eq 2672 | . . . . 5 ⊢ ((𝐴𝑃𝐵) = 0 → ((𝐴𝑃𝐵) + (𝐵𝑃𝐴)) = 0) |
16 | 15 | oveq2d 6666 | . . . 4 ⊢ ((𝐴𝑃𝐵) = 0 → (((𝐴𝑃𝐴) + (𝐵𝑃𝐵)) + ((𝐴𝑃𝐵) + (𝐵𝑃𝐴))) = (((𝐴𝑃𝐴) + (𝐵𝑃𝐵)) + 0)) |
17 | 1, 3 | dipcl 27567 | . . . . . . 7 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋 ∧ 𝐴 ∈ 𝑋) → (𝐴𝑃𝐴) ∈ ℂ) |
18 | 9, 5, 5, 17 | mp3an 1424 | . . . . . 6 ⊢ (𝐴𝑃𝐴) ∈ ℂ |
19 | 1, 3 | dipcl 27567 | . . . . . . 7 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐵 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋) → (𝐵𝑃𝐵) ∈ ℂ) |
20 | 9, 6, 6, 19 | mp3an 1424 | . . . . . 6 ⊢ (𝐵𝑃𝐵) ∈ ℂ |
21 | 18, 20 | addcli 10044 | . . . . 5 ⊢ ((𝐴𝑃𝐴) + (𝐵𝑃𝐵)) ∈ ℂ |
22 | 21 | addid1i 10223 | . . . 4 ⊢ (((𝐴𝑃𝐴) + (𝐵𝑃𝐵)) + 0) = ((𝐴𝑃𝐴) + (𝐵𝑃𝐵)) |
23 | 16, 22 | syl6eq 2672 | . . 3 ⊢ ((𝐴𝑃𝐵) = 0 → (((𝐴𝑃𝐴) + (𝐵𝑃𝐵)) + ((𝐴𝑃𝐵) + (𝐵𝑃𝐴))) = ((𝐴𝑃𝐴) + (𝐵𝑃𝐵))) |
24 | 7, 23 | syl5eq 2668 | . 2 ⊢ ((𝐴𝑃𝐵) = 0 → ((𝐴𝐺𝐵)𝑃(𝐴𝐺𝐵)) = ((𝐴𝑃𝐴) + (𝐵𝑃𝐵))) |
25 | 1, 2 | nvgcl 27475 | . . . 4 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋) → (𝐴𝐺𝐵) ∈ 𝑋) |
26 | 9, 5, 6, 25 | mp3an 1424 | . . 3 ⊢ (𝐴𝐺𝐵) ∈ 𝑋 |
27 | pyth.6 | . . . 4 ⊢ 𝑁 = (normCV‘𝑈) | |
28 | 1, 27, 3 | ipidsq 27565 | . . 3 ⊢ ((𝑈 ∈ NrmCVec ∧ (𝐴𝐺𝐵) ∈ 𝑋) → ((𝐴𝐺𝐵)𝑃(𝐴𝐺𝐵)) = ((𝑁‘(𝐴𝐺𝐵))↑2)) |
29 | 9, 26, 28 | mp2an 708 | . 2 ⊢ ((𝐴𝐺𝐵)𝑃(𝐴𝐺𝐵)) = ((𝑁‘(𝐴𝐺𝐵))↑2) |
30 | 1, 27, 3 | ipidsq 27565 | . . . 4 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐴 ∈ 𝑋) → (𝐴𝑃𝐴) = ((𝑁‘𝐴)↑2)) |
31 | 9, 5, 30 | mp2an 708 | . . 3 ⊢ (𝐴𝑃𝐴) = ((𝑁‘𝐴)↑2) |
32 | 1, 27, 3 | ipidsq 27565 | . . . 4 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝐵 ∈ 𝑋) → (𝐵𝑃𝐵) = ((𝑁‘𝐵)↑2)) |
33 | 9, 6, 32 | mp2an 708 | . . 3 ⊢ (𝐵𝑃𝐵) = ((𝑁‘𝐵)↑2) |
34 | 31, 33 | oveq12i 6662 | . 2 ⊢ ((𝐴𝑃𝐴) + (𝐵𝑃𝐵)) = (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2)) |
35 | 24, 29, 34 | 3eqtr3g 2679 | 1 ⊢ ((𝐴𝑃𝐵) = 0 → ((𝑁‘(𝐴𝐺𝐵))↑2) = (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 = wceq 1483 ∈ wcel 1990 ‘cfv 5888 (class class class)co 6650 ℂcc 9934 0cc0 9936 + caddc 9939 2c2 11070 ↑cexp 12860 NrmCVeccnv 27439 +𝑣 cpv 27440 BaseSetcba 27441 normCVcnmcv 27445 ·𝑖OLDcdip 27555 CPreHilOLDccphlo 27667 |
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-rep 4771 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-inf2 8538 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 ax-addf 10015 ax-mulf 10016 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-fal 1489 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-int 4476 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-se 5074 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-isom 5897 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-1st 7168 df-2nd 7169 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-1o 7560 df-oadd 7564 df-er 7742 df-en 7956 df-dom 7957 df-sdom 7958 df-fin 7959 df-sup 8348 df-oi 8415 df-card 8765 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-4 11081 df-n0 11293 df-z 11378 df-uz 11688 df-rp 11833 df-fz 12327 df-fzo 12466 df-seq 12802 df-exp 12861 df-hash 13118 df-cj 13839 df-re 13840 df-im 13841 df-sqrt 13975 df-abs 13976 df-clim 14219 df-sum 14417 df-grpo 27347 df-gid 27348 df-ginv 27349 df-ablo 27399 df-vc 27414 df-nv 27447 df-va 27450 df-ba 27451 df-sm 27452 df-0v 27453 df-nmcv 27455 df-dip 27556 df-ph 27668 |
This theorem is referenced by: (None) |
Copyright terms: Public domain | W3C validator |