cphsqrtcl2 - Metamath Proof Explorer

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Theorem cphsqrtcl2 25130

Description: The scalar field of a subcomplex pre-Hilbert space is closed under square roots of all numbers except possibly the negative reals. (Contributed by Mario Carneiro, 8-Oct-2015.)

**Hypotheses**
Ref	Expression
cphsca.f	⊢ 𝐹 = (Scalar‘𝑊)
cphsca.k	⊢ 𝐾 = (Base‘𝐹)

**Assertion**
Ref	Expression
cphsqrtcl2	⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) → (√‘𝐴) ∈ 𝐾)

**Proof of Theorem cphsqrtcl2**
Step	Hyp	Ref	Expression
1		sqrt0 15218	. . . . 5 ⊢ (√‘0) = 0
2		fveq2 6891	. . . . 5 ⊢ (𝐴 = 0 → (√‘𝐴) = (√‘0))
3		id 22	. . . . 5 ⊢ (𝐴 = 0 → 𝐴 = 0)
4	1, 2, 3	3eqtr4a 2791	. . . 4 ⊢ (𝐴 = 0 → (√‘𝐴) = 𝐴)
5	4	adantl 480	. . 3 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 = 0) → (√‘𝐴) = 𝐴)
6		simpl2 1189	. . 3 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 = 0) → 𝐴 ∈ 𝐾)
7	5, 6	eqeltrd 2825	. 2 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 = 0) → (√‘𝐴) ∈ 𝐾)
8		simpl1 1188	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 𝑊 ∈ ℂPreHil)
9		cphsca.f	. . . . . . . 8 ⊢ 𝐹 = (Scalar‘𝑊)
10		cphsca.k	. . . . . . . 8 ⊢ 𝐾 = (Base‘𝐹)
11	9, 10	cphsubrg 25124	. . . . . . 7 ⊢ (𝑊 ∈ ℂPreHil → 𝐾 ∈ (SubRing‘ℂ_fld))
12	8, 11	syl 17	. . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 𝐾 ∈ (SubRing‘ℂ_fld))
13		cnfldbas 21285	. . . . . . 7 ⊢ ℂ = (Base‘ℂ_fld)
14	13	subrgss 20513	. . . . . 6 ⊢ (𝐾 ∈ (SubRing‘ℂ_fld) → 𝐾 ⊆ ℂ)
15	12, 14	syl 17	. . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 𝐾 ⊆ ℂ)
16		simpl2 1189	. . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 𝐴 ∈ 𝐾)
17	9, 10	cphabscl 25129	. . . . . . . 8 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾) → (abs‘𝐴) ∈ 𝐾)
18	8, 16, 17	syl2anc 582	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ 𝐾)
19	15, 16	sseldd 3973	. . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 𝐴 ∈ ℂ)
20	19	abscld 15413	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℝ)
21	19	absge0d 15421	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 0 ≤ (abs‘𝐴))
22	9, 10	cphsqrtcl 25128	. . . . . . 7 ⊢ ((𝑊 ∈ ℂPreHil ∧ ((abs‘𝐴) ∈ 𝐾 ∧ (abs‘𝐴) ∈ ℝ ∧ 0 ≤ (abs‘𝐴))) → (√‘(abs‘𝐴)) ∈ 𝐾)
23	8, 18, 20, 21, 22	syl13anc 1369	. . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (√‘(abs‘𝐴)) ∈ 𝐾)
24		cnfldadd 21287	. . . . . . . . 9 ⊢ + = (+_g‘ℂ_fld)
25	24	subrgacl 20524	. . . . . . . 8 ⊢ ((𝐾 ∈ (SubRing‘ℂ_fld) ∧ (abs‘𝐴) ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) → ((abs‘𝐴) + 𝐴) ∈ 𝐾)
26	12, 18, 16, 25	syl3anc 1368	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((abs‘𝐴) + 𝐴) ∈ 𝐾)
27	9, 10	cphabscl 25129	. . . . . . . 8 ⊢ ((𝑊 ∈ ℂPreHil ∧ ((abs‘𝐴) + 𝐴) ∈ 𝐾) → (abs‘((abs‘𝐴) + 𝐴)) ∈ 𝐾)
28	8, 26, 27	syl2anc 582	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘((abs‘𝐴) + 𝐴)) ∈ 𝐾)
29	15, 26	sseldd 3973	. . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((abs‘𝐴) + 𝐴) ∈ ℂ)
30		simpl3 1190	. . . . . . . . 9 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ¬ -𝐴 ∈ ℝ⁺)
31	20	recnd 11270	. . . . . . . . . . . . . 14 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℂ)
32	31, 19	subnegd 11606	. . . . . . . . . . . . 13 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((abs‘𝐴) − -𝐴) = ((abs‘𝐴) + 𝐴))
33	32	eqeq1d 2727	. . . . . . . . . . . 12 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((abs‘𝐴) − -𝐴) = 0 ↔ ((abs‘𝐴) + 𝐴) = 0))
34	19	negcld 11586	. . . . . . . . . . . . 13 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → -𝐴 ∈ ℂ)
35	31, 34	subeq0ad 11609	. . . . . . . . . . . 12 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((abs‘𝐴) − -𝐴) = 0 ↔ (abs‘𝐴) = -𝐴))
36	33, 35	bitr3d 280	. . . . . . . . . . 11 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((abs‘𝐴) + 𝐴) = 0 ↔ (abs‘𝐴) = -𝐴))
37		absrpcl 15265	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℝ⁺)
38	19, 37	sylancom 586	. . . . . . . . . . . 12 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℝ⁺)
39		eleq1 2813	. . . . . . . . . . . 12 ⊢ ((abs‘𝐴) = -𝐴 → ((abs‘𝐴) ∈ ℝ⁺ ↔ -𝐴 ∈ ℝ⁺))
40	38, 39	syl5ibcom 244	. . . . . . . . . . 11 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((abs‘𝐴) = -𝐴 → -𝐴 ∈ ℝ⁺))
41	36, 40	sylbid 239	. . . . . . . . . 10 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((abs‘𝐴) + 𝐴) = 0 → -𝐴 ∈ ℝ⁺))
42	41	necon3bd 2944	. . . . . . . . 9 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (¬ -𝐴 ∈ ℝ⁺ → ((abs‘𝐴) + 𝐴) ≠ 0))
43	30, 42	mpd 15	. . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((abs‘𝐴) + 𝐴) ≠ 0)
44	29, 43	absne0d 15424	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘((abs‘𝐴) + 𝐴)) ≠ 0)
45	9, 10	cphdivcl 25126	. . . . . . 7 ⊢ ((𝑊 ∈ ℂPreHil ∧ (((abs‘𝐴) + 𝐴) ∈ 𝐾 ∧ (abs‘((abs‘𝐴) + 𝐴)) ∈ 𝐾 ∧ (abs‘((abs‘𝐴) + 𝐴)) ≠ 0)) → (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))) ∈ 𝐾)
46	8, 26, 28, 44, 45	syl13anc 1369	. . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))) ∈ 𝐾)
47		cnfldmul 21289	. . . . . . 7 ⊢ · = (._r‘ℂ_fld)
48	47	subrgmcl 20525	. . . . . 6 ⊢ ((𝐾 ∈ (SubRing‘ℂ_fld) ∧ (√‘(abs‘𝐴)) ∈ 𝐾 ∧ (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))) ∈ 𝐾) → ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) ∈ 𝐾)
49	12, 23, 46, 48	syl3anc 1368	. . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) ∈ 𝐾)
50	15, 49	sseldd 3973	. . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) ∈ ℂ)
51		eqid 2725	. . . . . . 7 ⊢ ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) = ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))
52	51	sqreulem 15336	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ ((abs‘𝐴) + 𝐴) ≠ 0) → ((((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))↑2) = 𝐴 ∧ 0 ≤ (ℜ‘((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))) ∧ (i · ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))) ∉ ℝ⁺))
53	19, 43, 52	syl2anc 582	. . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))↑2) = 𝐴 ∧ 0 ≤ (ℜ‘((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))) ∧ (i · ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))) ∉ ℝ⁺))
54	53	simp1d 1139	. . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))↑2) = 𝐴)
55	53	simp2d 1140	. . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 0 ≤ (ℜ‘((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))))
56	53	simp3d 1141	. . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (i · ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))) ∉ ℝ⁺)
57		df-nel 3037	. . . . 5 ⊢ ((i · ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))) ∉ ℝ⁺ ↔ ¬ (i · ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))) ∈ ℝ⁺)
58	56, 57	sylib 217	. . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ¬ (i · ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))) ∈ ℝ⁺)
59	50, 19, 54, 55, 58	eqsqrtd 15344	. . 3 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) = (√‘𝐴))
60	59, 49	eqeltrrd 2826	. 2 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (√‘𝐴) ∈ 𝐾)
61	7, 60	pm2.61dane 3019	1 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) → (√‘𝐴) ∈ 𝐾)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2930 ∉ wnel 3036 ⊆ wss 3940 class class class wbr 5143 ‘cfv 6542 (class class class)co 7415 ℂcc 11134 ℝcr 11135 0cc0 11136 ici 11138 + caddc 11139 · cmul 11141 ≤ cle 11277 − cmin 11472 -cneg 11473 / cdiv 11899 2c2 12295 ℝ⁺crp 13004 ↑cexp 14056 ℜcre 15074 √csqrt 15210 abscabs 15211 Basecbs 17177 Scalarcsca 17233 SubRingcsubrg 20508 ℂ_fldccnfld 21281 ℂPreHilccph 25110

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-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-rep 5280 ax-sep 5294 ax-nul 5301 ax-pow 5359 ax-pr 5423 ax-un 7737 ax-cnex 11192 ax-resscn 11193 ax-1cn 11194 ax-icn 11195 ax-addcl 11196 ax-addrcl 11197 ax-mulcl 11198 ax-mulrcl 11199 ax-mulcom 11200 ax-addass 11201 ax-mulass 11202 ax-distr 11203 ax-i2m1 11204 ax-1ne0 11205 ax-1rid 11206 ax-rnegex 11207 ax-rrecex 11208 ax-cnre 11209 ax-pre-lttri 11210 ax-pre-lttrn 11211 ax-pre-ltadd 11212 ax-pre-mulgt0 11213 ax-pre-sup 11214 ax-addf 11215 ax-mulf 11216

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3770 df-csb 3886 df-dif 3943 df-un 3945 df-in 3947 df-ss 3957 df-pss 3960 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-tp 4629 df-op 4631 df-uni 4904 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5227 df-tr 5261 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 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 7371 df-ov 7418 df-oprab 7419 df-mpo 7420 df-om 7868 df-1st 7989 df-2nd 7990 df-tpos 8228 df-frecs 8283 df-wrecs 8314 df-recs 8388 df-rdg 8427 df-1o 8483 df-er 8721 df-map 8843 df-en 8961 df-dom 8962 df-sdom 8963 df-fin 8964 df-sup 9463 df-pnf 11278 df-mnf 11279 df-xr 11280 df-ltxr 11281 df-le 11282 df-sub 11474 df-neg 11475 df-div 11900 df-nn 12241 df-2 12303 df-3 12304 df-4 12305 df-5 12306 df-6 12307 df-7 12308 df-8 12309 df-9 12310 df-n0 12501 df-z 12587 df-dec 12706 df-uz 12851 df-rp 13005 df-ico 13360 df-fz 13515 df-seq 13997 df-exp 14057 df-cj 15076 df-re 15077 df-im 15078 df-sqrt 15212 df-abs 15213 df-struct 17113 df-sets 17130 df-slot 17148 df-ndx 17160 df-base 17178 df-ress 17207 df-plusg 17243 df-mulr 17244 df-starv 17245 df-tset 17249 df-ple 17250 df-ds 17252 df-unif 17253 df-0g 17420 df-mgm 18597 df-sgrp 18676 df-mnd 18692 df-mhm 18737 df-grp 18895 df-minusg 18896 df-subg 19080 df-ghm 19170 df-cmn 19739 df-abl 19740 df-mgp 20077 df-rng 20095 df-ur 20124 df-ring 20177 df-cring 20178 df-oppr 20275 df-dvdsr 20298 df-unit 20299 df-invr 20329 df-dvr 20342 df-rhm 20413 df-subrng 20485 df-subrg 20510 df-drng 20628 df-staf 20727 df-srng 20728 df-lvec 20990 df-cnfld 21282 df-phl 21560 df-cph 25112

This theorem is referenced by: cphsqrtcl3 25131

W3C validator