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Theorem isph 30626

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 = (norm_CV‘𝑈)

**Assertion**
Ref	Expression
isph	⊢ (𝑈 ∈ CPreHil_OLD ↔ (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 30618	. 2 ⊢ (𝑈 ∈ CPreHil_OLD → 𝑈 ∈ NrmCVec)
2		isph.2	. . . . 5 ⊢ 𝐺 = ( +_𝑣 ‘𝑈)
3		eqid 2728	. . . . 5 ⊢ ( ·_𝑠OLD ‘𝑈) = ( ·_𝑠OLD ‘𝑈)
4		isph.6	. . . . 5 ⊢ 𝑁 = (norm_CV‘𝑈)
5	2, 3, 4	nvop 30480	. . . 4 ⊢ (𝑈 ∈ NrmCVec → 𝑈 = ⟨⟨𝐺, ( ·_𝑠OLD ‘𝑈)⟩, 𝑁⟩)
6		eleq1 2817	. . . . 5 ⊢ (𝑈 = ⟨⟨𝐺, ( ·_𝑠OLD ‘𝑈)⟩, 𝑁⟩ → (𝑈 ∈ CPreHil_OLD ↔ ⟨⟨𝐺, ( ·_𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ CPreHil_OLD))
7	2	fvexi 6906	. . . . . . 7 ⊢ 𝐺 ∈ V
8		fvex 6905	. . . . . . 7 ⊢ ( ·_𝑠OLD ‘𝑈) ∈ V
9	4	fvexi 6906	. . . . . . 7 ⊢ 𝑁 ∈ V
10		isph.1	. . . . . . . . 9 ⊢ 𝑋 = (BaseSet‘𝑈)
11	10, 2	bafval 30408	. . . . . . . 8 ⊢ 𝑋 = ran 𝐺
12	11	isphg 30621	. . . . . . 7 ⊢ ((𝐺 ∈ V ∧ ( ·_𝑠OLD ‘𝑈) ∈ V ∧ 𝑁 ∈ V) → (⟨⟨𝐺, ( ·_𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ CPreHil_OLD ↔ (⟨⟨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 1458	. . . . . 6 ⊢ (⟨⟨𝐺, ( ·_𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ CPreHil_OLD ↔ (⟨⟨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 30446	. . . . . . . . . . . . . . 15 ⊢ ((𝑈 ∈ NrmCVec ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑥𝑀𝑦) = (𝑥𝐺(-1( ·_𝑠OLD ‘𝑈)𝑦)))
16	15	3expa 1116	. . . . . . . . . . . . . 14 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑋) → (𝑥𝑀𝑦) = (𝑥𝐺(-1( ·_𝑠OLD ‘𝑈)𝑦)))
17	16	fveq2d 6896	. . . . . . . . . . . . 13 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑋) → (𝑁‘(𝑥𝑀𝑦)) = (𝑁‘(𝑥𝐺(-1( ·_𝑠OLD ‘𝑈)𝑦))))
18	17	oveq1d 7430	. . . . . . . . . . . 12 ⊢ (((𝑈 ∈ NrmCVec ∧ 𝑥 ∈ 𝑋) ∧ 𝑦 ∈ 𝑋) → ((𝑁‘(𝑥𝑀𝑦))↑2) = ((𝑁‘(𝑥𝐺(-1( ·_𝑠OLD ‘𝑈)𝑦)))↑2))
19	18	oveq2d 7431	. . . . . . . . . . 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 2730	. . . . . . . . . 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 3171	. . . . . . . . 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 3171	. . . . . . . 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 2817	. . . . . . . 8 ⊢ (𝑈 = ⟨⟨𝐺, ( ·_𝑠OLD ‘𝑈)⟩, 𝑁⟩ → (𝑈 ∈ NrmCVec ↔ ⟨⟨𝐺, ( ·_𝑠OLD ‘𝑈)⟩, 𝑁⟩ ∈ NrmCVec))
25	24	anbi1d 630	. . . . . . 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⟩ ∈ CPreHil_OLD ↔ (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 ∈ CPreHil_OLD ↔ (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 ∈ CPreHil_OLD ↔ (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 ∈ CPreHil_OLD ↔ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))))
31	1, 30	biadanii 821	1 ⊢ (𝑈 ∈ CPreHil_OLD ↔ (𝑈 ∈ NrmCVec ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑁‘(𝑥𝐺𝑦))↑2) + ((𝑁‘(𝑥𝑀𝑦))↑2)) = (2 · (((𝑁‘𝑥)↑2) + ((𝑁‘𝑦)↑2)))))

Colors of variables: wff setvar class

Syntax hints: ↔ wb 205 ∧ wa 395 = wceq 1534 ∈ wcel 2099 ∀wral 3057 Vcvv 3470 ⟨cop 4631 ‘cfv 6543 (class class class)co 7415 1c1 11134 + caddc 11136 · cmul 11138 -cneg 11470 2c2 12292 ↑cexp 14053 NrmCVeccnv 30388 +_𝑣 cpv 30389 BaseSetcba 30390 ·_𝑠OLD cns 30391 −_𝑣 cnsb 30393 norm_CVcnmcv 30394 CPreHil_OLDccphlo 30616

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5280 ax-sep 5294 ax-nul 5301 ax-pow 5360 ax-pr 5424 ax-un 7735 ax-resscn 11190 ax-1cn 11191 ax-icn 11192 ax-addcl 11193 ax-addrcl 11194 ax-mulcl 11195 ax-mulrcl 11196 ax-mulcom 11197 ax-addass 11198 ax-mulass 11199 ax-distr 11200 ax-i2m1 11201 ax-1ne0 11202 ax-1rid 11203 ax-rnegex 11204 ax-rrecex 11205 ax-cnre 11206 ax-pre-lttri 11207 ax-pre-lttrn 11208 ax-pre-ltadd 11209

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-nul 4320 df-if 4526 df-pw 4601 df-sn 4626 df-pr 4628 df-op 4632 df-uni 4905 df-iun 4994 df-br 5144 df-opab 5206 df-mpt 5227 df-id 5571 df-po 5585 df-so 5586 df-xp 5679 df-rel 5680 df-cnv 5681 df-co 5682 df-dm 5683 df-rn 5684 df-res 5685 df-ima 5686 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 7371 df-ov 7418 df-oprab 7419 df-mpo 7420 df-1st 7988 df-2nd 7989 df-er 8719 df-en 8959 df-dom 8960 df-sdom 8961 df-pnf 11275 df-mnf 11276 df-ltxr 11278 df-sub 11471 df-neg 11472 df-grpo 30297 df-gid 30298 df-ginv 30299 df-gdiv 30300 df-ablo 30349 df-vc 30363 df-nv 30396 df-va 30399 df-ba 30400 df-sm 30401 df-0v 30402 df-vs 30403 df-nmcv 30404 df-ph 30617

This theorem is referenced by: phpar2 30627

W3C validator