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Theorem nmparlem 24987

Description: Lemma for nmpar 24988. (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 24955	. . . 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 24958	. . . 4 ⊢ (𝜑 → ((𝐴 − 𝐵) , (𝐴 − 𝐵)) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) − ((𝐴 , 𝐵) + (𝐵 , 𝐴))))
10	7, 9	oveq12d 7429	. . 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 24937	. . . . . . 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 24826	. . . . . 6 ⊢ (𝑊 ∈ ℂMod → 𝐾 ⊆ ℂ)
16	12, 15	syl 17	. . . . 5 ⊢ (𝜑 → 𝐾 ⊆ ℂ)
17		cphphl 24919	. . . . . . . 8 ⊢ (𝑊 ∈ ℂPreHil → 𝑊 ∈ PreHil)
18	4, 17	syl 17	. . . . . . 7 ⊢ (𝜑 → 𝑊 ∈ PreHil)
19	13, 1, 2, 14	ipcl 21405	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐴 ∈ 𝑉 ∧ 𝐴 ∈ 𝑉) → (𝐴 , 𝐴) ∈ 𝐾)
20	18, 5, 5, 19	syl3anc 1369	. . . . . 6 ⊢ (𝜑 → (𝐴 , 𝐴) ∈ 𝐾)
21	13, 1, 2, 14	ipcl 21405	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐵 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐵 , 𝐵) ∈ 𝐾)
22	18, 6, 6, 21	syl3anc 1369	. . . . . 6 ⊢ (𝜑 → (𝐵 , 𝐵) ∈ 𝐾)
23	13, 14	clmacl 24831	. . . . . 6 ⊢ ((𝑊 ∈ ℂMod ∧ (𝐴 , 𝐴) ∈ 𝐾 ∧ (𝐵 , 𝐵) ∈ 𝐾) → ((𝐴 , 𝐴) + (𝐵 , 𝐵)) ∈ 𝐾)
24	12, 20, 22, 23	syl3anc 1369	. . . . 5 ⊢ (𝜑 → ((𝐴 , 𝐴) + (𝐵 , 𝐵)) ∈ 𝐾)
25	16, 24	sseldd 3982	. . . 4 ⊢ (𝜑 → ((𝐴 , 𝐴) + (𝐵 , 𝐵)) ∈ ℂ)
26	13, 1, 2, 14	ipcl 21405	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐴 , 𝐵) ∈ 𝐾)
27	18, 5, 6, 26	syl3anc 1369	. . . . . 6 ⊢ (𝜑 → (𝐴 , 𝐵) ∈ 𝐾)
28	13, 1, 2, 14	ipcl 21405	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐵 ∈ 𝑉 ∧ 𝐴 ∈ 𝑉) → (𝐵 , 𝐴) ∈ 𝐾)
29	18, 6, 5, 28	syl3anc 1369	. . . . . 6 ⊢ (𝜑 → (𝐵 , 𝐴) ∈ 𝐾)
30	13, 14	clmacl 24831	. . . . . 6 ⊢ ((𝑊 ∈ ℂMod ∧ (𝐴 , 𝐵) ∈ 𝐾 ∧ (𝐵 , 𝐴) ∈ 𝐾) → ((𝐴 , 𝐵) + (𝐵 , 𝐴)) ∈ 𝐾)
31	12, 27, 29, 30	syl3anc 1369	. . . . 5 ⊢ (𝜑 → ((𝐴 , 𝐵) + (𝐵 , 𝐴)) ∈ 𝐾)
32	16, 31	sseldd 3982	. . . 4 ⊢ (𝜑 → ((𝐴 , 𝐵) + (𝐵 , 𝐴)) ∈ ℂ)
33	25, 32, 25	ppncand 11615	. . 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 2770	. 2 ⊢ (𝜑 → (((𝐴 + 𝐵) , (𝐴 + 𝐵)) + ((𝐴 − 𝐵) , (𝐴 − 𝐵))) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
35		cphlmod 24922	. . . . . 6 ⊢ (𝑊 ∈ ℂPreHil → 𝑊 ∈ LMod)
36	4, 35	syl 17	. . . . 5 ⊢ (𝜑 → 𝑊 ∈ LMod)
37	2, 3	lmodvacl 20629	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐴 + 𝐵) ∈ 𝑉)
38	36, 5, 6, 37	syl3anc 1369	. . . 4 ⊢ (𝜑 → (𝐴 + 𝐵) ∈ 𝑉)
39		nmpar.n	. . . . 5 ⊢ 𝑁 = (norm‘𝑊)
40	2, 1, 39	nmsq 24942	. . . 4 ⊢ ((𝑊 ∈ ℂPreHil ∧ (𝐴 + 𝐵) ∈ 𝑉) → ((𝑁‘(𝐴 + 𝐵))↑2) = ((𝐴 + 𝐵) , (𝐴 + 𝐵)))
41	4, 38, 40	syl2anc 582	. . 3 ⊢ (𝜑 → ((𝑁‘(𝐴 + 𝐵))↑2) = ((𝐴 + 𝐵) , (𝐴 + 𝐵)))
42	2, 8	lmodvsubcl 20661	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐴 − 𝐵) ∈ 𝑉)
43	36, 5, 6, 42	syl3anc 1369	. . . 4 ⊢ (𝜑 → (𝐴 − 𝐵) ∈ 𝑉)
44	2, 1, 39	nmsq 24942	. . . 4 ⊢ ((𝑊 ∈ ℂPreHil ∧ (𝐴 − 𝐵) ∈ 𝑉) → ((𝑁‘(𝐴 − 𝐵))↑2) = ((𝐴 − 𝐵) , (𝐴 − 𝐵)))
45	4, 43, 44	syl2anc 582	. . 3 ⊢ (𝜑 → ((𝑁‘(𝐴 − 𝐵))↑2) = ((𝐴 − 𝐵) , (𝐴 − 𝐵)))
46	41, 45	oveq12d 7429	. 2 ⊢ (𝜑 → (((𝑁‘(𝐴 + 𝐵))↑2) + ((𝑁‘(𝐴 − 𝐵))↑2)) = (((𝐴 + 𝐵) , (𝐴 + 𝐵)) + ((𝐴 − 𝐵) , (𝐴 − 𝐵))))
47	2, 1, 39	nmsq 24942	. . . . . 6 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝑉) → ((𝑁‘𝐴)↑2) = (𝐴 , 𝐴))
48	4, 5, 47	syl2anc 582	. . . . 5 ⊢ (𝜑 → ((𝑁‘𝐴)↑2) = (𝐴 , 𝐴))
49	2, 1, 39	nmsq 24942	. . . . . 6 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐵 ∈ 𝑉) → ((𝑁‘𝐵)↑2) = (𝐵 , 𝐵))
50	4, 6, 49	syl2anc 582	. . . . 5 ⊢ (𝜑 → ((𝑁‘𝐵)↑2) = (𝐵 , 𝐵))
51	48, 50	oveq12d 7429	. . . 4 ⊢ (𝜑 → (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2)) = ((𝐴 , 𝐴) + (𝐵 , 𝐵)))
52	51	oveq2d 7427	. . 3 ⊢ (𝜑 → (2 · (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2))) = (2 · ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
53	25	2timesd 12459	. . 3 ⊢ (𝜑 → (2 · ((𝐴 , 𝐴) + (𝐵 , 𝐵))) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
54	52, 53	eqtrd 2770	. 2 ⊢ (𝜑 → (2 · (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2))) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
55	34, 46, 54	3eqtr4d 2780	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 1539 ∈ wcel 2104 ⊆ wss 3947 ‘cfv 6542 (class class class)co 7411 ℂcc 11110 + caddc 11115 · cmul 11117 − cmin 11448 2c2 12271 ↑cexp 14031 Basecbs 17148 +_gcplusg 17201 Scalarcsca 17204 ·_𝑖cip 17206 -_gcsg 18857 LModclmod 20614 PreHilcphl 21396 normcnm 24305 ℂModcclm 24809 ℂPreHilccph 24914

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 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 ax-pre-sup 11190 ax-addf 11191 ax-mulf 11192

This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3474 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-tp 4632 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-tpos 8213 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-1o 8468 df-er 8705 df-map 8824 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-sup 9439 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-div 11876 df-nn 12217 df-2 12279 df-3 12280 df-4 12281 df-5 12282 df-6 12283 df-7 12284 df-8 12285 df-9 12286 df-n0 12477 df-z 12563 df-dec 12682 df-uz 12827 df-rp 12979 df-fz 13489 df-seq 13971 df-exp 14032 df-cj 15050 df-re 15051 df-im 15052 df-sqrt 15186 df-abs 15187 df-struct 17084 df-sets 17101 df-slot 17119 df-ndx 17131 df-base 17149 df-ress 17178 df-plusg 17214 df-mulr 17215 df-starv 17216 df-sca 17217 df-vsca 17218 df-ip 17219 df-tset 17220 df-ple 17221 df-ds 17223 df-unif 17224 df-0g 17391 df-mgm 18565 df-sgrp 18644 df-mnd 18660 df-mhm 18705 df-grp 18858 df-minusg 18859 df-sbg 18860 df-subg 19039 df-ghm 19128 df-cmn 19691 df-abl 19692 df-mgp 20029 df-rng 20047 df-ur 20076 df-ring 20129 df-cring 20130 df-oppr 20225 df-dvdsr 20248 df-unit 20249 df-rhm 20363 df-subrg 20459 df-drng 20502 df-staf 20596 df-srng 20597 df-lmod 20616 df-lmhm 20777 df-lvec 20858 df-sra 20930 df-rgmod 20931 df-cnfld 21145 df-phl 21398 df-nlm 24315 df-clm 24810 df-cph 24916

This theorem is referenced by: nmpar 24988

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