cphsqrtcl2 - Metamath Proof Explorer

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Theorem cphsqrtcl2 25069

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 15194	. . . . 5 ⊢ (√‘0) = 0
2		fveq2 6885	. . . . 5 ⊢ (𝐴 = 0 → (√‘𝐴) = (√‘0))
3		id 22	. . . . 5 ⊢ (𝐴 = 0 → 𝐴 = 0)
4	1, 2, 3	3eqtr4a 2792	. . . 4 ⊢ (𝐴 = 0 → (√‘𝐴) = 𝐴)
5	4	adantl 481	. . 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 2827	. 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 25063	. . . . . . 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 21244	. . . . . . 7 ⊢ ℂ = (Base‘ℂ_fld)
14	13	subrgss 20474	. . . . . 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 25068	. . . . . . . 8 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾) → (abs‘𝐴) ∈ 𝐾)
18	8, 16, 17	syl2anc 583	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ 𝐾)
19	15, 16	sseldd 3978	. . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 𝐴 ∈ ℂ)
20	19	abscld 15389	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℝ)
21	19	absge0d 15397	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 0 ≤ (abs‘𝐴))
22	9, 10	cphsqrtcl 25067	. . . . . . 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 21246	. . . . . . . . 9 ⊢ + = (+_g‘ℂ_fld)
25	24	subrgacl 20485	. . . . . . . 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 25068	. . . . . . . 8 ⊢ ((𝑊 ∈ ℂPreHil ∧ ((abs‘𝐴) + 𝐴) ∈ 𝐾) → (abs‘((abs‘𝐴) + 𝐴)) ∈ 𝐾)
28	8, 26, 27	syl2anc 583	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘((abs‘𝐴) + 𝐴)) ∈ 𝐾)
29	15, 26	sseldd 3978	. . . . . . . 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 11246	. . . . . . . . . . . . . 14 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℂ)
32	31, 19	subnegd 11582	. . . . . . . . . . . . 13 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((abs‘𝐴) − -𝐴) = ((abs‘𝐴) + 𝐴))
33	32	eqeq1d 2728	. . . . . . . . . . . 12 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((abs‘𝐴) − -𝐴) = 0 ↔ ((abs‘𝐴) + 𝐴) = 0))
34	19	negcld 11562	. . . . . . . . . . . . 13 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → -𝐴 ∈ ℂ)
35	31, 34	subeq0ad 11585	. . . . . . . . . . . 12 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((abs‘𝐴) − -𝐴) = 0 ↔ (abs‘𝐴) = -𝐴))
36	33, 35	bitr3d 281	. . . . . . . . . . 11 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((abs‘𝐴) + 𝐴) = 0 ↔ (abs‘𝐴) = -𝐴))
37		absrpcl 15241	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℝ⁺)
38	19, 37	sylancom 587	. . . . . . . . . . . 12 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℝ⁺)
39		eleq1 2815	. . . . . . . . . . . 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 2948	. . . . . . . . 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 15400	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘((abs‘𝐴) + 𝐴)) ≠ 0)
45	9, 10	cphdivcl 25065	. . . . . . 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 21248	. . . . . . 7 ⊢ · = (._r‘ℂ_fld)
48	47	subrgmcl 20486	. . . . . 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 3978	. . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) ∈ ℂ)
51		eqid 2726	. . . . . . 7 ⊢ ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) = ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))
52	51	sqreulem 15312	. . . . . 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 583	. . . . 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 3041	. . . . 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 15320	. . 3 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) = (√‘𝐴))
60	59, 49	eqeltrrd 2828	. 2 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (√‘𝐴) ∈ 𝐾)
61	7, 60	pm2.61dane 3023	1 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) → (√‘𝐴) ∈ 𝐾)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2934 ∉ wnel 3040 ⊆ wss 3943 class class class wbr 5141 ‘cfv 6537 (class class class)co 7405 ℂcc 11110 ℝcr 11111 0cc0 11112 ici 11114 + caddc 11115 · cmul 11117 ≤ cle 11253 − cmin 11448 -cneg 11449 / cdiv 11875 2c2 12271 ℝ⁺crp 12980 ↑cexp 14032 ℜcre 15050 √csqrt 15186 abscabs 15187 Basecbs 17153 Scalarcsca 17209 SubRingcsubrg 20469 ℂ_fldccnfld 21240 ℂPreHilccph 25049

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 2163 ax-ext 2697 ax-rep 5278 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7722 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 ax-pre-sup 11190 ax-addf 11191 ax-mulf 11192

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 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 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-nel 3041 df-ral 3056 df-rex 3065 df-rmo 3370 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-pss 3962 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-tp 4628 df-op 4630 df-uni 4903 df-iun 4992 df-br 5142 df-opab 5204 df-mpt 5225 df-tr 5259 df-id 5567 df-eprel 5573 df-po 5581 df-so 5582 df-fr 5624 df-we 5626 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-pred 6294 df-ord 6361 df-on 6362 df-lim 6363 df-suc 6364 df-iota 6489 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7853 df-1st 7974 df-2nd 7975 df-tpos 8212 df-frecs 8267 df-wrecs 8298 df-recs 8372 df-rdg 8411 df-1o 8467 df-er 8705 df-map 8824 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-sup 9439 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-div 11876 df-nn 12217 df-2 12279 df-3 12280 df-4 12281 df-5 12282 df-6 12283 df-7 12284 df-8 12285 df-9 12286 df-n0 12477 df-z 12563 df-dec 12682 df-uz 12827 df-rp 12981 df-ico 13336 df-fz 13491 df-seq 13973 df-exp 14033 df-cj 15052 df-re 15053 df-im 15054 df-sqrt 15188 df-abs 15189 df-struct 17089 df-sets 17106 df-slot 17124 df-ndx 17136 df-base 17154 df-ress 17183 df-plusg 17219 df-mulr 17220 df-starv 17221 df-tset 17225 df-ple 17226 df-ds 17228 df-unif 17229 df-0g 17396 df-mgm 18573 df-sgrp 18652 df-mnd 18668 df-mhm 18713 df-grp 18866 df-minusg 18867 df-subg 19050 df-ghm 19139 df-cmn 19702 df-abl 19703 df-mgp 20040 df-rng 20058 df-ur 20087 df-ring 20140 df-cring 20141 df-oppr 20236 df-dvdsr 20259 df-unit 20260 df-invr 20290 df-dvr 20303 df-rhm 20374 df-subrng 20446 df-subrg 20471 df-drng 20589 df-staf 20688 df-srng 20689 df-lvec 20951 df-cnfld 21241 df-phl 21519 df-cph 25051

This theorem is referenced by: cphsqrtcl3 25070

W3C validator