Theorem isph 30784

Description: The predicate "is an inner product space." (Contributed by NM, 1-Feb-2008.) (New usage is discouraged.)

Hypotheses

Ref	Expression
isph.1	⊢ 𝑋 = (BaseSet‘𝑈)
isph.2	⊢ 𝐺 = ( +𝑣 ‘𝑈)
isph.3	⊢ 𝑀 = ( −𝑣 ‘𝑈)
isph.6	⊢ 𝑁 = (normCV‘𝑈)

Assertion

Ref	Expression
isph	⊢ (𝑈 ∈ CPreHilOLD ↔ (𝑈 ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))))

Distinct variable groups:   𝑥,𝑦,𝐺   𝑥,𝑀,𝑦   𝑥,𝑁,𝑦   𝑥,𝑈,𝑦   𝑥,𝑋,𝑦

Proof of Theorem isph

Step	Hyp	Ref	Expression
1		phnv 30776	. 2 ⊢ (𝑈 ∈ CPreHilOLD → 𝑈 ∈ NrmCVec)
2		isph.2	. . . . 5 ⊢ 𝐺 = ( +𝑣 ‘𝑈)
3		eqid 2729	. . . . 5 ⊢ ( ·𝑠OLD ‘𝑈) = ( ·𝑠OLD ‘𝑈)
4		isph.6	. . . . 5 ⊢ 𝑁 = (normCV‘𝑈)
5	2, 3, 4	nvop 30638	. . . 4 ⊢ (𝑈 ∈ NrmCVec → 𝑈 = ⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩)
6		eleq1 2816	. . . . 5 ⊢ (𝑈 = ⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ → (𝑈 ∈ CPreHilOLD ↔ ⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ CPreHilOLD))
7	2	fvexi 6840	. . . . . . 7 ⊢ 𝐺 ∈ V
8		fvex 6839	. . . . . . 7 ⊢ ( ·𝑠OLD ‘𝑈) ∈ V
9	4	fvexi 6840	. . . . . . 7 ⊢ 𝑁 ∈ V
10		isph.1	. . . . . . . . 9 ⊢ 𝑋 = (BaseSet‘𝑈)
11	10, 2	bafval 30566	. . . . . . . 8 ⊢ 𝑋 = ran 𝐺
12	11	isphg 30779	. . . . . . 7 ⊢ ((𝐺 ∈ V ∧ ( ·𝑠OLD ‘𝑈) ∈ V ∧ 𝑁 ∈ V) → (⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ CPreHilOLD ↔ (⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2))))))
13	7, 8, 9, 12	mp3an 1463	. . . . . 6 ⊢ (⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ CPreHilOLD ↔ (⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))))
14		isph.3	. . . . . . . . . . . . . . . 16 ⊢ 𝑀 = ( −𝑣 ‘𝑈)
15	10, 2, 3, 14	nvmval 30604	. . . . . . . . . . . . . . 15 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑥𝑀𝑦) = (𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))
16	15	3expa 1118	. . . . . . . . . . . . . 14 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑋) → (𝑥𝑀𝑦) = (𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))
17	16	fveq2d 6830	. . . . . . . . . . . . 13 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑋) → (𝑁‘(𝑥𝑀𝑦)) = (𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦))))
18	17	oveq1d 7368	. . . . . . . . . . . 12 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑋) → ((𝑁‘(𝑥𝑀𝑦))↑2) = ((𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))↑2))
19	18	oveq2d 7369	. . . . . . . . . . 11 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑋) → (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))↑2)))
20	19	eqeq1d 2731	. . . . . . . . . 10 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑋) → ((((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2))) ↔ (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))))
21	20	ralbidva 3150	. . . . . . . . 9 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝑥 ∈ 𝑋) → (∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2))) ↔ ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))))
22	21	ralbidva 3150	. . . . . . . 8 ⊢ (𝑈 ∈ NrmCVec → (∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2))) ↔ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))))
23	22	pm5.32i 574	. . . . . . 7 ⊢ ((𝑈 ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))) ↔ (𝑈 ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))))
24		eleq1 2816	. . . . . . . 8 ⊢ (𝑈 = ⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ → (𝑈 ∈ NrmCVec ↔ ⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ NrmCVec))
25	24	anbi1d 631	. . . . . . 7 ⊢ (𝑈 = ⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ → ((𝑈 ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))) ↔ (⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2))))))
26	23, 25	bitr2id 284	. . . . . 6 ⊢ (𝑈 = ⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ → ((⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝐺(-1( ·𝑠OLD ‘𝑈)𝑦)))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))) ↔ (𝑈 ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2))))))
27	13, 26	bitrid 283	. . . . 5 ⊢ (𝑈 = ⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ → (⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ CPreHilOLD ↔ (𝑈 ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2))))))
28	6, 27	bitrd 279	. . . 4 ⊢ (𝑈 = ⟨⟨𝐺, ( ·𝑠OLD ‘𝑈)⟩, 𝑁⟩ → (𝑈 ∈ CPreHilOLD ↔ (𝑈 ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2))))))
29	5, 28	syl 17	. . 3 ⊢ (𝑈 ∈ NrmCVec → (𝑈 ∈ CPreHilOLD ↔ (𝑈 ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2))))))
30	29	bianabs 541	. 2 ⊢ (𝑈 ∈ NrmCVec → (𝑈 ∈ CPreHilOLD ↔ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))))
31	1, 30	biadanii 821	1 ⊢ (𝑈 ∈ CPreHilOLD ↔ (𝑈 ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))))

Syntax hints:   ↔ wb 206   ∧ wa 395   = wceq 1540   ∈ wcel 2109  ∀wral 3044  Vcvv 3438  ⟨cop 4585  ‘cfv 6486  (class class class)co 7353  1c1 11029   + caddc 11031   · cmul 11033  -cneg 11366  2c2 12201  ↑cexp 13986  NrmCVeccnv 30546   +_𝑣 cpv 30547  BaseSetcba 30548   ·_𝑠OLD cns 30549   −_𝑣 cnsb 30551  norm_CVcnmcv 30552  CPreHil_OLDccphlo 30774

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 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5221  ax-sep 5238  ax-nul 5248  ax-pow 5307  ax-pr 5374  ax-un 7675  ax-resscn 11085  ax-1cn 11086  ax-icn 11087  ax-addcl 11088  ax-addrcl 11089  ax-mulcl 11090  ax-mulrcl 11091  ax-mulcom 11092  ax-addass 11093  ax-mulass 11094  ax-distr 11095  ax-i2m1 11096  ax-1ne0 11097  ax-1rid 11098  ax-rnegex 11099  ax-rrecex 11100  ax-cnre 11101  ax-pre-lttri 11102  ax-pre-lttrn 11103  ax-pre-ltadd 11104

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-nel 3030  df-ral 3045  df-rex 3054  df-reu 3346  df-rab 3397  df-v 3440  df-sbc 3745  df-csb 3854  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4479  df-pw 4555  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4862  df-iun 4946  df-br 5096  df-opab 5158  df-mpt 5177  df-id 5518  df-po 5531  df-so 5532  df-xp 5629  df-rel 5630  df-cnv 5631  df-co 5632  df-dm 5633  df-rn 5634  df-res 5635  df-ima 5636  df-iota 6442  df-fun 6488  df-fn 6489  df-f 6490  df-f1 6491  df-fo 6492  df-f1o 6493  df-fv 6494  df-riota 7310  df-ov 7356  df-oprab 7357  df-mpo 7358  df-1st 7931  df-2nd 7932  df-er 8632  df-en 8880  df-dom 8881  df-sdom 8882  df-pnf 11170  df-mnf 11171  df-ltxr 11173  df-sub 11367  df-neg 11368  df-grpo 30455  df-gid 30456  df-ginv 30457  df-gdiv 30458  df-ablo 30507  df-vc 30521  df-nv 30554  df-va 30557  df-ba 30558  df-sm 30559  df-0v 30560  df-vs 30561  df-nmcv 30562  df-ph 30775

This theorem is referenced by:  phpar2  30785