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Theorem nmparlem 24988

Description: Lemma for nmpar 24989. (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 24956	. . . 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 24959	. . . 4 ⊢ (𝜑 → ((𝐴 − 𝐵) , (𝐴 − 𝐵)) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) − ((𝐴 , 𝐵) + (𝐵 , 𝐴))))
10	7, 9	oveq12d 7430	. . 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 24938	. . . . . . 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 24827	. . . . . 6 ⊢ (𝑊 ∈ ℂMod → 𝐾 ⊆ ℂ)
16	12, 15	syl 17	. . . . 5 ⊢ (𝜑 → 𝐾 ⊆ ℂ)
17		cphphl 24920	. . . . . . . 8 ⊢ (𝑊 ∈ ℂPreHil → 𝑊 ∈ PreHil)
18	4, 17	syl 17	. . . . . . 7 ⊢ (𝜑 → 𝑊 ∈ PreHil)
19	13, 1, 2, 14	ipcl 21406	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐴 ∈ 𝑉 ∧ 𝐴 ∈ 𝑉) → (𝐴 , 𝐴) ∈ 𝐾)
20	18, 5, 5, 19	syl3anc 1370	. . . . . 6 ⊢ (𝜑 → (𝐴 , 𝐴) ∈ 𝐾)
21	13, 1, 2, 14	ipcl 21406	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐵 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐵 , 𝐵) ∈ 𝐾)
22	18, 6, 6, 21	syl3anc 1370	. . . . . 6 ⊢ (𝜑 → (𝐵 , 𝐵) ∈ 𝐾)
23	13, 14	clmacl 24832	. . . . . 6 ⊢ ((𝑊 ∈ ℂMod ∧ (𝐴 , 𝐴) ∈ 𝐾 ∧ (𝐵 , 𝐵) ∈ 𝐾) → ((𝐴 , 𝐴) + (𝐵 , 𝐵)) ∈ 𝐾)
24	12, 20, 22, 23	syl3anc 1370	. . . . 5 ⊢ (𝜑 → ((𝐴 , 𝐴) + (𝐵 , 𝐵)) ∈ 𝐾)
25	16, 24	sseldd 3983	. . . 4 ⊢ (𝜑 → ((𝐴 , 𝐴) + (𝐵 , 𝐵)) ∈ ℂ)
26	13, 1, 2, 14	ipcl 21406	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐴 , 𝐵) ∈ 𝐾)
27	18, 5, 6, 26	syl3anc 1370	. . . . . 6 ⊢ (𝜑 → (𝐴 , 𝐵) ∈ 𝐾)
28	13, 1, 2, 14	ipcl 21406	. . . . . . 7 ⊢ ((𝑊 ∈ PreHil ∧ 𝐵 ∈ 𝑉 ∧ 𝐴 ∈ 𝑉) → (𝐵 , 𝐴) ∈ 𝐾)
29	18, 6, 5, 28	syl3anc 1370	. . . . . 6 ⊢ (𝜑 → (𝐵 , 𝐴) ∈ 𝐾)
30	13, 14	clmacl 24832	. . . . . 6 ⊢ ((𝑊 ∈ ℂMod ∧ (𝐴 , 𝐵) ∈ 𝐾 ∧ (𝐵 , 𝐴) ∈ 𝐾) → ((𝐴 , 𝐵) + (𝐵 , 𝐴)) ∈ 𝐾)
31	12, 27, 29, 30	syl3anc 1370	. . . . 5 ⊢ (𝜑 → ((𝐴 , 𝐵) + (𝐵 , 𝐴)) ∈ 𝐾)
32	16, 31	sseldd 3983	. . . 4 ⊢ (𝜑 → ((𝐴 , 𝐵) + (𝐵 , 𝐴)) ∈ ℂ)
33	25, 32, 25	ppncand 11616	. . 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 2771	. 2 ⊢ (𝜑 → (((𝐴 + 𝐵) , (𝐴 + 𝐵)) + ((𝐴 − 𝐵) , (𝐴 − 𝐵))) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
35		cphlmod 24923	. . . . . 6 ⊢ (𝑊 ∈ ℂPreHil → 𝑊 ∈ LMod)
36	4, 35	syl 17	. . . . 5 ⊢ (𝜑 → 𝑊 ∈ LMod)
37	2, 3	lmodvacl 20630	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐴 + 𝐵) ∈ 𝑉)
38	36, 5, 6, 37	syl3anc 1370	. . . 4 ⊢ (𝜑 → (𝐴 + 𝐵) ∈ 𝑉)
39		nmpar.n	. . . . 5 ⊢ 𝑁 = (norm‘𝑊)
40	2, 1, 39	nmsq 24943	. . . 4 ⊢ ((𝑊 ∈ ℂPreHil ∧ (𝐴 + 𝐵) ∈ 𝑉) → ((𝑁‘(𝐴 + 𝐵))↑2) = ((𝐴 + 𝐵) , (𝐴 + 𝐵)))
41	4, 38, 40	syl2anc 583	. . 3 ⊢ (𝜑 → ((𝑁‘(𝐴 + 𝐵))↑2) = ((𝐴 + 𝐵) , (𝐴 + 𝐵)))
42	2, 8	lmodvsubcl 20662	. . . . 5 ⊢ ((𝑊 ∈ LMod ∧ 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉) → (𝐴 − 𝐵) ∈ 𝑉)
43	36, 5, 6, 42	syl3anc 1370	. . . 4 ⊢ (𝜑 → (𝐴 − 𝐵) ∈ 𝑉)
44	2, 1, 39	nmsq 24943	. . . 4 ⊢ ((𝑊 ∈ ℂPreHil ∧ (𝐴 − 𝐵) ∈ 𝑉) → ((𝑁‘(𝐴 − 𝐵))↑2) = ((𝐴 − 𝐵) , (𝐴 − 𝐵)))
45	4, 43, 44	syl2anc 583	. . 3 ⊢ (𝜑 → ((𝑁‘(𝐴 − 𝐵))↑2) = ((𝐴 − 𝐵) , (𝐴 − 𝐵)))
46	41, 45	oveq12d 7430	. 2 ⊢ (𝜑 → (((𝑁‘(𝐴 + 𝐵))↑2) + ((𝑁‘(𝐴 − 𝐵))↑2)) = (((𝐴 + 𝐵) , (𝐴 + 𝐵)) + ((𝐴 − 𝐵) , (𝐴 − 𝐵))))
47	2, 1, 39	nmsq 24943	. . . . . 6 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝑉) → ((𝑁‘𝐴)↑2) = (𝐴 , 𝐴))
48	4, 5, 47	syl2anc 583	. . . . 5 ⊢ (𝜑 → ((𝑁‘𝐴)↑2) = (𝐴 , 𝐴))
49	2, 1, 39	nmsq 24943	. . . . . 6 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐵 ∈ 𝑉) → ((𝑁‘𝐵)↑2) = (𝐵 , 𝐵))
50	4, 6, 49	syl2anc 583	. . . . 5 ⊢ (𝜑 → ((𝑁‘𝐵)↑2) = (𝐵 , 𝐵))
51	48, 50	oveq12d 7430	. . . 4 ⊢ (𝜑 → (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2)) = ((𝐴 , 𝐴) + (𝐵 , 𝐵)))
52	51	oveq2d 7428	. . 3 ⊢ (𝜑 → (2 · (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2))) = (2 · ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
53	25	2timesd 12460	. . 3 ⊢ (𝜑 → (2 · ((𝐴 , 𝐴) + (𝐵 , 𝐵))) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
54	52, 53	eqtrd 2771	. 2 ⊢ (𝜑 → (2 · (((𝑁‘𝐴)↑2) + ((𝑁‘𝐵)↑2))) = (((𝐴 , 𝐴) + (𝐵 , 𝐵)) + ((𝐴 , 𝐴) + (𝐵 , 𝐵))))
55	34, 46, 54	3eqtr4d 2781	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 1540 ∈ wcel 2105 ⊆ wss 3948 ‘cfv 6543 (class class class)co 7412 ℂcc 11111 + caddc 11116 · cmul 11118 − cmin 11449 2c2 12272 ↑cexp 14032 Basecbs 17149 +_gcplusg 17202 Scalarcsca 17205 ·_𝑖cip 17207 -_gcsg 18858 LModclmod 20615 PreHilcphl 21397 normcnm 24306 ℂModcclm 24810 ℂPreHilccph 24915

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2702 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7728 ax-cnex 11169 ax-resscn 11170 ax-1cn 11171 ax-icn 11172 ax-addcl 11173 ax-addrcl 11174 ax-mulcl 11175 ax-mulrcl 11176 ax-mulcom 11177 ax-addass 11178 ax-mulass 11179 ax-distr 11180 ax-i2m1 11181 ax-1ne0 11182 ax-1rid 11183 ax-rnegex 11184 ax-rrecex 11185 ax-cnre 11186 ax-pre-lttri 11187 ax-pre-lttrn 11188 ax-pre-ltadd 11189 ax-pre-mulgt0 11190 ax-pre-sup 11191 ax-addf 11192 ax-mulf 11193

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3375 df-reu 3376 df-rab 3432 df-v 3475 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-tp 4633 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7368 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7859 df-1st 7978 df-2nd 7979 df-tpos 8214 df-frecs 8269 df-wrecs 8300 df-recs 8374 df-rdg 8413 df-1o 8469 df-er 8706 df-map 8825 df-en 8943 df-dom 8944 df-sdom 8945 df-fin 8946 df-sup 9440 df-pnf 11255 df-mnf 11256 df-xr 11257 df-ltxr 11258 df-le 11259 df-sub 11451 df-neg 11452 df-div 11877 df-nn 12218 df-2 12280 df-3 12281 df-4 12282 df-5 12283 df-6 12284 df-7 12285 df-8 12286 df-9 12287 df-n0 12478 df-z 12564 df-dec 12683 df-uz 12828 df-rp 12980 df-fz 13490 df-seq 13972 df-exp 14033 df-cj 15051 df-re 15052 df-im 15053 df-sqrt 15187 df-abs 15188 df-struct 17085 df-sets 17102 df-slot 17120 df-ndx 17132 df-base 17150 df-ress 17179 df-plusg 17215 df-mulr 17216 df-starv 17217 df-sca 17218 df-vsca 17219 df-ip 17220 df-tset 17221 df-ple 17222 df-ds 17224 df-unif 17225 df-0g 17392 df-mgm 18566 df-sgrp 18645 df-mnd 18661 df-mhm 18706 df-grp 18859 df-minusg 18860 df-sbg 18861 df-subg 19040 df-ghm 19129 df-cmn 19692 df-abl 19693 df-mgp 20030 df-rng 20048 df-ur 20077 df-ring 20130 df-cring 20131 df-oppr 20226 df-dvdsr 20249 df-unit 20250 df-rhm 20364 df-subrg 20460 df-drng 20503 df-staf 20597 df-srng 20598 df-lmod 20617 df-lmhm 20778 df-lvec 20859 df-sra 20931 df-rgmod 20932 df-cnfld 21146 df-phl 21399 df-nlm 24316 df-clm 24811 df-cph 24917

This theorem is referenced by: nmpar 24989

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