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Theorem nmparlem 24756

Description: Lemma for nmpar 24757. (Contributed by Mario Carneiro, 7-Oct-2015.)

**Hypotheses**
Ref	Expression
nmpar.v	⊢ 𝑉 = (Base‘𝑊)
nmpar.p	⊢ + = (+_g‘𝑊)
nmpar.m	⊢ − = (-_g‘𝑊)
nmpar.n	⊢ 𝑁 = (norm‘𝑊)
nmpar.h	⊢ , = (·_𝑖‘𝑊)
nmpar.f	⊢ 𝐹 = (Scalar‘𝑊)
nmpar.k	⊢ 𝐾 = (Base‘𝐹)
nmpar.1	⊢ (𝜑 → 𝑊 ∈ ℂPreHil)
nmpar.2	⊢ (𝜑 → 𝐴 ∈ 𝑉)
nmpar.3	⊢ (𝜑 → 𝐵 ∈ 𝑉)

**Assertion**
Ref	Expression
nmparlem	⊢ (𝜑 → (((𝑁‘(𝐴 + 𝐵))↑2) + ((𝑁‘(𝐴 − 𝐵))↑2)) = (2 · (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2))))

**Proof of Theorem nmparlem**
Step	Hyp	Ref	Expression
1		nmpar.h	. . . . 5 ⊢ , = (·_𝑖‘𝑊)
2		nmpar.v	. . . . 5 ⊢ 𝑉 = (Base‘𝑊)
3		nmpar.p	. . . . 5 ⊢ + = (+_g‘𝑊)
4		nmpar.1	. . . . 5 ⊢ (𝜑 → 𝑊 ∈ ℂPreHil)
5		nmpar.2	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
6		nmpar.3	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ 𝑉)
7	1, 2, 3, 4, 5, 6, 5, 6	cph2di 24724	. . . 4 ⊢ (𝜑 → ((𝐴 + 𝐵) , (𝐴 + 𝐵)) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐵) + (𝐵 , 𝐴))))
8		nmpar.m	. . . . 5 ⊢ − = (-_g‘𝑊)
9	1, 2, 8, 4, 5, 6, 5, 6	cph2subdi 24727	. . . 4 ⊢ (𝜑 → ((𝐴 − 𝐵) , (𝐴 − 𝐵)) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) − ((𝐴 , 𝐵) + (𝐵 , 𝐴))))
10	7, 9	oveq12d 7427	. . 3 ⊢ (𝜑 → (((𝐴 + 𝐵) , (𝐴 + 𝐵)) + ((𝐴 − 𝐵) , (𝐴 − 𝐵))) = ((((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐵) + (𝐵 , 𝐴))) + (((𝐴 , 𝐴) + (𝐵 , 𝐵)) − ((𝐴 , 𝐵) + (𝐵 , 𝐴)))))
11		cphclm 24706	. . . . . . 7 ⊢ (𝑊 ∈ ℂPreHil → 𝑊 ∈ ℂMod)
12	4, 11	syl 17	. . . . . 6 ⊢ (𝜑 → 𝑊 ∈ ℂMod)
13		nmpar.f	. . . . . . 7 ⊢ 𝐹 = (Scalar‘𝑊)
14		nmpar.k	. . . . . . 7 ⊢ 𝐾 = (Base‘𝐹)
15	13, 14	clmsscn 24595	. . . . . 6 ⊢ (𝑊 ∈ ℂMod → 𝐾 ⊆ ℂ)
16	12, 15	syl 17	. . . . 5 ⊢ (𝜑 → 𝐾 ⊆ ℂ)
17		cphphl 24688	. . . . . . . 8 ⊢ (𝑊 ∈ ℂPreHil → 𝑊 ∈ PreHil)
18	4, 17	syl 17	. . . . . . 7 ⊢ (𝜑 → 𝑊 ∈ PreHil)
19	13, 1, 2, 14	ipcl 21186	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐴 ∈ 𝑉 ∧ 𝐴 ∈ 𝑉) → (𝐴 , 𝐴) ∈ 𝐾)
20	18, 5, 5, 19	syl3anc 1372	. . . . . 6 ⊢ (𝜑 → (𝐴 , 𝐴) ∈ 𝐾)
21	13, 1, 2, 14	ipcl 21186	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐵 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐵 , 𝐵) ∈ 𝐾)
22	18, 6, 6, 21	syl3anc 1372	. . . . . 6 ⊢ (𝜑 → (𝐵 , 𝐵) ∈ 𝐾)
23	13, 14	clmacl 24600	. . . . . 6 ⊢ ((𝑊 ∈ ℂMod ∧ (𝐴 , 𝐴) ∈ 𝐾 ∧ (𝐵 , 𝐵) ∈ 𝐾) → ((𝐴 , 𝐴) + (𝐵 , 𝐵)) ∈ 𝐾)
24	12, 20, 22, 23	syl3anc 1372	. . . . 5 ⊢ (𝜑 → ((𝐴 , 𝐴) + (𝐵 , 𝐵)) ∈ 𝐾)
25	16, 24	sseldd 3984	. . . 4 ⊢ (𝜑 → ((𝐴 , 𝐴) + (𝐵 , 𝐵)) ∈ ℂ)
26	13, 1, 2, 14	ipcl 21186	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐴 , 𝐵) ∈ 𝐾)
27	18, 5, 6, 26	syl3anc 1372	. . . . . 6 ⊢ (𝜑 → (𝐴 , 𝐵) ∈ 𝐾)
28	13, 1, 2, 14	ipcl 21186	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐵 ∈ 𝑉 ∧ 𝐴 ∈ 𝑉) → (𝐵 , 𝐴) ∈ 𝐾)
29	18, 6, 5, 28	syl3anc 1372	. . . . . 6 ⊢ (𝜑 → (𝐵 , 𝐴) ∈ 𝐾)
30	13, 14	clmacl 24600	. . . . . 6 ⊢ ((𝑊 ∈ ℂMod ∧ (𝐴 , 𝐵) ∈ 𝐾 ∧ (𝐵 , 𝐴) ∈ 𝐾) → ((𝐴 , 𝐵) + (𝐵 , 𝐴)) ∈ 𝐾)
31	12, 27, 29, 30	syl3anc 1372	. . . . 5 ⊢ (𝜑 → ((𝐴 , 𝐵) + (𝐵 , 𝐴)) ∈ 𝐾)
32	16, 31	sseldd 3984	. . . 4 ⊢ (𝜑 → ((𝐴 , 𝐵) + (𝐵 , 𝐴)) ∈ ℂ)
33	25, 32, 25	ppncand 11611	. . 3 ⊢ (𝜑 → ((((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐵) + (𝐵 , 𝐴))) + (((𝐴 , 𝐴) + (𝐵 , 𝐵)) − ((𝐴 , 𝐵) + (𝐵 , 𝐴)))) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
34	10, 33	eqtrd 2773	. 2 ⊢ (𝜑 → (((𝐴 + 𝐵) , (𝐴 + 𝐵)) + ((𝐴 − 𝐵) , (𝐴 − 𝐵))) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
35		cphlmod 24691	. . . . . 6 ⊢ (𝑊 ∈ ℂPreHil → 𝑊 ∈ LMod)
36	4, 35	syl 17	. . . . 5 ⊢ (𝜑 → 𝑊 ∈ LMod)
37	2, 3	lmodvacl 20486	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐴 + 𝐵) ∈ 𝑉)
38	36, 5, 6, 37	syl3anc 1372	. . . 4 ⊢ (𝜑 → (𝐴 + 𝐵) ∈ 𝑉)
39		nmpar.n	. . . . 5 ⊢ 𝑁 = (norm‘𝑊)
40	2, 1, 39	nmsq 24711	. . . 4 ⊢ ((𝑊 ∈ ℂPreHil ∧ (𝐴 + 𝐵) ∈ 𝑉) → ((𝑁‘(𝐴 + 𝐵))↑2) = ((𝐴 + 𝐵) , (𝐴 + 𝐵)))
41	4, 38, 40	syl2anc 585	. . 3 ⊢ (𝜑 → ((𝑁‘(𝐴 + 𝐵))↑2) = ((𝐴 + 𝐵) , (𝐴 + 𝐵)))
42	2, 8	lmodvsubcl 20517	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐴 − 𝐵) ∈ 𝑉)
43	36, 5, 6, 42	syl3anc 1372	. . . 4 ⊢ (𝜑 → (𝐴 − 𝐵) ∈ 𝑉)
44	2, 1, 39	nmsq 24711	. . . 4 ⊢ ((𝑊 ∈ ℂPreHil ∧ (𝐴 − 𝐵) ∈ 𝑉) → ((𝑁‘(𝐴 − 𝐵))↑2) = ((𝐴 − 𝐵) , (𝐴 − 𝐵)))
45	4, 43, 44	syl2anc 585	. . 3 ⊢ (𝜑 → ((𝑁‘(𝐴 − 𝐵))↑2) = ((𝐴 − 𝐵) , (𝐴 − 𝐵)))
46	41, 45	oveq12d 7427	. 2 ⊢ (𝜑 → (((𝑁‘(𝐴 + 𝐵))↑2) + ((𝑁‘(𝐴 − 𝐵))↑2)) = (((𝐴 + 𝐵) , (𝐴 + 𝐵)) + ((𝐴 − 𝐵) , (𝐴 − 𝐵))))
47	2, 1, 39	nmsq 24711	. . . . . 6 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝑉) → ((𝑁‘𝐴)↑2) = (𝐴 , 𝐴))
48	4, 5, 47	syl2anc 585	. . . . 5 ⊢ (𝜑 → ((𝑁‘𝐴)↑2) = (𝐴 , 𝐴))
49	2, 1, 39	nmsq 24711	. . . . . 6 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐵 ∈ 𝑉) → ((𝑁‘𝐵)↑2) = (𝐵 , 𝐵))
50	4, 6, 49	syl2anc 585	. . . . 5 ⊢ (𝜑 → ((𝑁‘𝐵)↑2) = (𝐵 , 𝐵))
51	48, 50	oveq12d 7427	. . . 4 ⊢ (𝜑 → (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2)) = ((𝐴 , 𝐴) + (𝐵 , 𝐵)))
52	51	oveq2d 7425	. . 3 ⊢ (𝜑 → (2 · (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2))) = (2 · ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
53	25	2timesd 12455	. . 3 ⊢ (𝜑 → (2 · ((𝐴 , 𝐴) + (𝐵 , 𝐵))) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
54	52, 53	eqtrd 2773	. 2 ⊢ (𝜑 → (2 · (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2))) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
55	34, 46, 54	3eqtr4d 2783	1 ⊢ (𝜑 → (((𝑁‘(𝐴 + 𝐵))↑2) + ((𝑁‘(𝐴 − 𝐵))↑2)) = (2 · (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1542 ∈ wcel 2107 ⊆ wss 3949 ‘cfv 6544 (class class class)co 7409 ℂcc 11108 + caddc 11113 · cmul 11115 − cmin 11444 2c2 12267 ↑cexp 14027 Basecbs 17144 +_gcplusg 17197 Scalarcsca 17200 ·_𝑖cip 17202 -_gcsg 18821 LModclmod 20471 PreHilcphl 21177 normcnm 24085 ℂModcclm 24578 ℂPreHilccph 24683

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187 ax-pre-sup 11188 ax-addf 11189 ax-mulf 11190

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-tp 4634 df-op 4636 df-uni 4910 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-tpos 8211 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-er 8703 df-map 8822 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-sup 9437 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-div 11872 df-nn 12213 df-2 12275 df-3 12276 df-4 12277 df-5 12278 df-6 12279 df-7 12280 df-8 12281 df-9 12282 df-n0 12473 df-z 12559 df-dec 12678 df-uz 12823 df-rp 12975 df-fz 13485 df-seq 13967 df-exp 14028 df-cj 15046 df-re 15047 df-im 15048 df-sqrt 15182 df-abs 15183 df-struct 17080 df-sets 17097 df-slot 17115 df-ndx 17127 df-base 17145 df-ress 17174 df-plusg 17210 df-mulr 17211 df-starv 17212 df-sca 17213 df-vsca 17214 df-ip 17215 df-tset 17216 df-ple 17217 df-ds 17219 df-unif 17220 df-0g 17387 df-mgm 18561 df-sgrp 18610 df-mnd 18626 df-mhm 18671 df-grp 18822 df-minusg 18823 df-sbg 18824 df-subg 19003 df-ghm 19090 df-cmn 19650 df-abl 19651 df-mgp 19988 df-ur 20005 df-ring 20058 df-cring 20059 df-oppr 20150 df-dvdsr 20171 df-unit 20172 df-rnghom 20251 df-subrg 20317 df-drng 20359 df-staf 20453 df-srng 20454 df-lmod 20473 df-lmhm 20633 df-lvec 20714 df-sra 20785 df-rgmod 20786 df-cnfld 20945 df-phl 21179 df-nlm 24095 df-clm 24579 df-cph 24685

This theorem is referenced by: nmpar 24757

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