Theorem iscph 25181

Description: A subcomplex pre-Hilbert space is exactly a pre-Hilbert space over a subfield of the field of complex numbers closed under square roots of nonnegative reals equipped with a norm. (Contributed by Mario Carneiro, 8-Oct-2015.)

Hypotheses

Ref	Expression
iscph.v	⊢ 𝑉 = (Base‘𝑊)
iscph.h	⊢ , = (·𝑖‘𝑊)
iscph.n	⊢ 𝑁 = (norm‘𝑊)
iscph.f	⊢ 𝐹 = (Scalar‘𝑊)
iscph.k	⊢ 𝐾 = (Base‘𝐹)

Assertion

Ref	Expression
iscph	⊢ (𝑊 ∈ ℂPreHil ↔ ((𝑊 ∈ PreHil ∧ 𝑊 ∈ NrmMod ∧ 𝐹 = (ℂfld ↾s 𝐾)) ∧ (√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥)))))

Distinct variable group:   𝑥,𝑊

Allowed substitution hints:   𝐹(𝑥)   , (𝑥)   𝐾(𝑥)   𝑁(𝑥)   𝑉(𝑥)

Proof of Theorem iscph

Dummy variables 𝑓 𝑘 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		elin 3962	. . . . 5 ⊢ (𝑊 ∈ (PreHil ∩ NrmMod) ↔ (𝑊 ∈ PreHil ∧ 𝑊 ∈ NrmMod))
2	1	anbi1i 622	. . . 4 ⊢ ((𝑊 ∈ (PreHil ∩ NrmMod) ∧ 𝐹 = (ℂfld ↾s 𝐾)) ↔ ((𝑊 ∈ PreHil ∧ 𝑊 ∈ NrmMod) ∧ 𝐹 = (ℂfld ↾s 𝐾)))
3		df-3an 1086	. . . 4 ⊢ ((𝑊 ∈ PreHil ∧ 𝑊 ∈ NrmMod ∧ 𝐹 = (ℂfld ↾s 𝐾)) ↔ ((𝑊 ∈ PreHil ∧ 𝑊 ∈ NrmMod) ∧ 𝐹 = (ℂfld ↾s 𝐾)))
4	2, 3	bitr4i 277	. . 3 ⊢ ((𝑊 ∈ (PreHil ∩ NrmMod) ∧ 𝐹 = (ℂfld ↾s 𝐾)) ↔ (𝑊 ∈ PreHil ∧ 𝑊 ∈ NrmMod ∧ 𝐹 = (ℂfld ↾s 𝐾)))
5	4	anbi1i 622	. 2 ⊢ (((𝑊 ∈ (PreHil ∩ NrmMod) ∧ 𝐹 = (ℂfld ↾s 𝐾)) ∧ ((√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥))))) ↔ ((𝑊 ∈ PreHil ∧ 𝑊 ∈ NrmMod ∧ 𝐹 = (ℂfld ↾s 𝐾)) ∧ ((√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥))))))
6		fvexd 6915	. . . . 5 ⊢ (𝑤 = 𝑊 → (Scalar‘𝑤) ∈ V)
7		fvexd 6915	. . . . . 6 ⊢ ((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) → (Base‘𝑓) ∈ V)
8		simplr 767	. . . . . . . . . 10 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → 𝑓 = (Scalar‘𝑤))
9		simpll 765	. . . . . . . . . . . 12 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → 𝑤 = 𝑊)
10	9	fveq2d 6904	. . . . . . . . . . 11 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (Scalar‘𝑤) = (Scalar‘𝑊))
11		iscph.f	. . . . . . . . . . 11 ⊢ 𝐹 = (Scalar‘𝑊)
12	10, 11	eqtr4di 2783	. . . . . . . . . 10 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (Scalar‘𝑤) = 𝐹)
13	8, 12	eqtrd 2765	. . . . . . . . 9 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → 𝑓 = 𝐹)
14		simpr 483	. . . . . . . . . . 11 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → 𝑘 = (Base‘𝑓))
15	13	fveq2d 6904	. . . . . . . . . . . 12 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (Base‘𝑓) = (Base‘𝐹))
16		iscph.k	. . . . . . . . . . . 12 ⊢ 𝐾 = (Base‘𝐹)
17	15, 16	eqtr4di 2783	. . . . . . . . . . 11 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (Base‘𝑓) = 𝐾)
18	14, 17	eqtrd 2765	. . . . . . . . . 10 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → 𝑘 = 𝐾)
19	18	oveq2d 7439	. . . . . . . . 9 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (ℂfld ↾s 𝑘) = (ℂfld ↾s 𝐾))
20	13, 19	eqeq12d 2741	. . . . . . . 8 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (𝑓 = (ℂfld ↾s 𝑘) ↔ 𝐹 = (ℂfld ↾s 𝐾)))
21	18	ineq1d 4211	. . . . . . . . . 10 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (𝑘 ∩ (0[,)+∞)) = (𝐾 ∩ (0[,)+∞)))
22	21	imaeq2d 6068	. . . . . . . . 9 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (√ “ (𝑘 ∩ (0[,)+∞))) = (√ “ (𝐾 ∩ (0[,)+∞))))
23	22, 18	sseq12d 4012	. . . . . . . 8 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → ((√ “ (𝑘 ∩ (0[,)+∞))) ⊆ 𝑘 ↔ (√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾))
24	9	fveq2d 6904	. . . . . . . . . 10 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (norm‘𝑤) = (norm‘𝑊))
25		iscph.n	. . . . . . . . . 10 ⊢ 𝑁 = (norm‘𝑊)
26	24, 25	eqtr4di 2783	. . . . . . . . 9 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (norm‘𝑤) = 𝑁)
27	9	fveq2d 6904	. . . . . . . . . . 11 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (Base‘𝑤) = (Base‘𝑊))
28		iscph.v	. . . . . . . . . . 11 ⊢ 𝑉 = (Base‘𝑊)
29	27, 28	eqtr4di 2783	. . . . . . . . . 10 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (Base‘𝑤) = 𝑉)
30	9	fveq2d 6904	. . . . . . . . . . . . 13 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (·𝑖‘𝑤) = (·𝑖‘𝑊))
31		iscph.h	. . . . . . . . . . . . 13 ⊢ , = (·𝑖‘𝑊)
32	30, 31	eqtr4di 2783	. . . . . . . . . . . 12 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (·𝑖‘𝑤) = , )
33	32	oveqd 7440	. . . . . . . . . . 11 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (𝑥(·𝑖‘𝑤)𝑥) = (𝑥 , 𝑥))
34	33	fveq2d 6904	. . . . . . . . . 10 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (√‘(𝑥(·𝑖‘𝑤)𝑥)) = (√‘(𝑥 , 𝑥)))
35	29, 34	mpteq12dv 5243	. . . . . . . . 9 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → (𝑥 ∈ (Base‘𝑤) ↦ (√‘(𝑥(·𝑖‘𝑤)𝑥))) = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥))))
36	26, 35	eqeq12d 2741	. . . . . . . 8 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → ((norm‘𝑤) = (𝑥 ∈ (Base‘𝑤) ↦ (√‘(𝑥(·𝑖‘𝑤)𝑥))) ↔ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥)))))
37	20, 23, 36	3anbi123d 1432	. . . . . . 7 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → ((𝑓 = (ℂfld ↾s 𝑘) ∧ (√ “ (𝑘 ∩ (0[,)+∞))) ⊆ 𝑘 ∧ (norm‘𝑤) = (𝑥 ∈ (Base‘𝑤) ↦ (√‘(𝑥(·𝑖‘𝑤)𝑥)))) ↔ (𝐹 = (ℂfld ↾s 𝐾) ∧ (√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥))))))
38		3anass 1092	. . . . . . 7 ⊢ ((𝐹 = (ℂfld ↾s 𝐾) ∧ (√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥)))) ↔ (𝐹 = (ℂfld ↾s 𝐾) ∧ ((√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥))))))
39	37, 38	bitrdi 286	. . . . . 6 ⊢ (((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) ∧ 𝑘 = (Base‘𝑓)) → ((𝑓 = (ℂfld ↾s 𝑘) ∧ (√ “ (𝑘 ∩ (0[,)+∞))) ⊆ 𝑘 ∧ (norm‘𝑤) = (𝑥 ∈ (Base‘𝑤) ↦ (√‘(𝑥(·𝑖‘𝑤)𝑥)))) ↔ (𝐹 = (ℂfld ↾s 𝐾) ∧ ((√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥)))))))
40	7, 39	sbcied 3821	. . . . 5 ⊢ ((𝑤 = 𝑊 ∧ 𝑓 = (Scalar‘𝑤)) → ([(Base‘𝑓) / 𝑘](𝑓 = (ℂfld ↾s 𝑘) ∧ (√ “ (𝑘 ∩ (0[,)+∞))) ⊆ 𝑘 ∧ (norm‘𝑤) = (𝑥 ∈ (Base‘𝑤) ↦ (√‘(𝑥(·𝑖‘𝑤)𝑥)))) ↔ (𝐹 = (ℂfld ↾s 𝐾) ∧ ((√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥)))))))
41	6, 40	sbcied 3821	. . . 4 ⊢ (𝑤 = 𝑊 → ([(Scalar‘𝑤) / 𝑓][(Base‘𝑓) / 𝑘](𝑓 = (ℂfld ↾s 𝑘) ∧ (√ “ (𝑘 ∩ (0[,)+∞))) ⊆ 𝑘 ∧ (norm‘𝑤) = (𝑥 ∈ (Base‘𝑤) ↦ (√‘(𝑥(·𝑖‘𝑤)𝑥)))) ↔ (𝐹 = (ℂfld ↾s 𝐾) ∧ ((√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥)))))))
42		df-cph 25179	. . . 4 ⊢ ℂPreHil = {𝑤 ∈ (PreHil ∩ NrmMod) ∣ [(Scalar‘𝑤) / 𝑓][(Base‘𝑓) / 𝑘](𝑓 = (ℂfld ↾s 𝑘) ∧ (√ “ (𝑘 ∩ (0[,)+∞))) ⊆ 𝑘 ∧ (norm‘𝑤) = (𝑥 ∈ (Base‘𝑤) ↦ (√‘(𝑥(·𝑖‘𝑤)𝑥))))}
43	41, 42	elrab2 3683	. . 3 ⊢ (𝑊 ∈ ℂPreHil ↔ (𝑊 ∈ (PreHil ∩ NrmMod) ∧ (𝐹 = (ℂfld ↾s 𝐾) ∧ ((√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥)))))))
44		anass 467	. . 3 ⊢ (((𝑊 ∈ (PreHil ∩ NrmMod) ∧ 𝐹 = (ℂfld ↾s 𝐾)) ∧ ((√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥))))) ↔ (𝑊 ∈ (PreHil ∩ NrmMod) ∧ (𝐹 = (ℂfld ↾s 𝐾) ∧ ((√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥)))))))
45	43, 44	bitr4i 277	. 2 ⊢ (𝑊 ∈ ℂPreHil ↔ ((𝑊 ∈ (PreHil ∩ NrmMod) ∧ 𝐹 = (ℂfld ↾s 𝐾)) ∧ ((√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥))))))
46		3anass 1092	. 2 ⊢ (((𝑊 ∈ PreHil ∧ 𝑊 ∈ NrmMod ∧ 𝐹 = (ℂfld ↾s 𝐾)) ∧ (√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥)))) ↔ ((𝑊 ∈ PreHil ∧ 𝑊 ∈ NrmMod ∧ 𝐹 = (ℂfld ↾s 𝐾)) ∧ ((√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥))))))
47	5, 45, 46	3bitr4i 302	1 ⊢ (𝑊 ∈ ℂPreHil ↔ ((𝑊 ∈ PreHil ∧ 𝑊 ∈ NrmMod ∧ 𝐹 = (ℂfld ↾s 𝐾)) ∧ (√ “ (𝐾 ∩ (0[,)+∞))) ⊆ 𝐾 ∧ 𝑁 = (𝑥 ∈ 𝑉 ↦ (√‘(𝑥 , 𝑥)))))

Syntax hints:   ↔ wb 205   ∧ wa 394   ∧ w3a 1084   = wceq 1533   ∈ wcel 2098  Vcvv 3461  [wsbc 3775   ∩ cin 3945   ⊆ wss 3946   ↦ cmpt 5235   “ cima 5684  ‘cfv 6553  (class class class)co 7423  0cc0 11154  +∞cpnf 11291  [,)cico 13375  √csqrt 15233  Basecbs 17208   ↾_s cress 17237  Scalarcsca 17264  ·_𝑖cip 17266  ℂ_fldccnfld 21335  PreHilcphl 21612  normcnm 24568  NrmModcnlm 24572  ℂPreHilccph 25177

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-ext 2696  ax-nul 5310

This theorem depends on definitions:  df-bi 206  df-an 395  df-or 846  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-sb 2060  df-clab 2703  df-cleq 2717  df-clel 2802  df-ne 2930  df-rab 3419  df-v 3463  df-sbc 3776  df-dif 3949  df-un 3951  df-in 3953  df-ss 3963  df-nul 4325  df-if 4533  df-sn 4633  df-pr 4635  df-op 4639  df-uni 4913  df-br 5153  df-opab 5215  df-mpt 5236  df-xp 5687  df-cnv 5689  df-dm 5691  df-rn 5692  df-res 5693  df-ima 5694  df-iota 6505  df-fv 6561  df-ov 7426  df-cph 25179

This theorem is referenced by:  cphphl  25182  cphnlm  25183  cphsca  25190  cphsqrtcl  25195  cphnmfval  25203  tcphcph  25248  cphsscph  25262