cphsqrtcl2 - Metamath Proof Explorer

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Theorem cphsqrtcl2 24694

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 15184	. . . . 5 ⊢ (√‘0) = 0
2		fveq2 6888	. . . . 5 ⊢ (𝐴 = 0 → (√‘𝐴) = (√‘0))
3		id 22	. . . . 5 ⊢ (𝐴 = 0 → 𝐴 = 0)
4	1, 2, 3	3eqtr4a 2798	. . . 4 ⊢ (𝐴 = 0 → (√‘𝐴) = 𝐴)
5	4	adantl 482	. . 3 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 = 0) → (√‘𝐴) = 𝐴)
6		simpl2 1192	. . 3 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 = 0) → 𝐴 ∈ 𝐾)
7	5, 6	eqeltrd 2833	. 2 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 = 0) → (√‘𝐴) ∈ 𝐾)
8		simpl1 1191	. . . . . . 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 24688	. . . . . . 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 20940	. . . . . . 7 ⊢ ℂ = (Base‘ℂ_fld)
14	13	subrgss 20356	. . . . . 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 1192	. . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 𝐴 ∈ 𝐾)
17	9, 10	cphabscl 24693	. . . . . . . 8 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾) → (abs‘𝐴) ∈ 𝐾)
18	8, 16, 17	syl2anc 584	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ 𝐾)
19	15, 16	sseldd 3982	. . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 𝐴 ∈ ℂ)
20	19	abscld 15379	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℝ)
21	19	absge0d 15387	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 0 ≤ (abs‘𝐴))
22	9, 10	cphsqrtcl 24692	. . . . . . 7 ⊢ ((𝑊 ∈ ℂPreHil ∧ ((abs‘𝐴) ∈ 𝐾 ∧ (abs‘𝐴) ∈ ℝ ∧ 0 ≤ (abs‘𝐴))) → (√‘(abs‘𝐴)) ∈ 𝐾)
23	8, 18, 20, 21, 22	syl13anc 1372	. . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (√‘(abs‘𝐴)) ∈ 𝐾)
24		cnfldadd 20941	. . . . . . . . 9 ⊢ + = (+_g‘ℂ_fld)
25	24	subrgacl 20366	. . . . . . . 8 ⊢ ((𝐾 ∈ (SubRing‘ℂ_fld) ∧ (abs‘𝐴) ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) → ((abs‘𝐴) + 𝐴) ∈ 𝐾)
26	12, 18, 16, 25	syl3anc 1371	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((abs‘𝐴) + 𝐴) ∈ 𝐾)
27	9, 10	cphabscl 24693	. . . . . . . 8 ⊢ ((𝑊 ∈ ℂPreHil ∧ ((abs‘𝐴) + 𝐴) ∈ 𝐾) → (abs‘((abs‘𝐴) + 𝐴)) ∈ 𝐾)
28	8, 26, 27	syl2anc 584	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘((abs‘𝐴) + 𝐴)) ∈ 𝐾)
29	15, 26	sseldd 3982	. . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((abs‘𝐴) + 𝐴) ∈ ℂ)
30		simpl3 1193	. . . . . . . . 9 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ¬ -𝐴 ∈ ℝ⁺)
31	20	recnd 11238	. . . . . . . . . . . . . 14 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℂ)
32	31, 19	subnegd 11574	. . . . . . . . . . . . 13 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((abs‘𝐴) − -𝐴) = ((abs‘𝐴) + 𝐴))
33	32	eqeq1d 2734	. . . . . . . . . . . 12 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((abs‘𝐴) − -𝐴) = 0 ↔ ((abs‘𝐴) + 𝐴) = 0))
34	19	negcld 11554	. . . . . . . . . . . . 13 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → -𝐴 ∈ ℂ)
35	31, 34	subeq0ad 11577	. . . . . . . . . . . 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 15231	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℝ⁺)
38	19, 37	sylancom 588	. . . . . . . . . . . 12 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℝ⁺)
39		eleq1 2821	. . . . . . . . . . . 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 2954	. . . . . . . . 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 15390	. . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (abs‘((abs‘𝐴) + 𝐴)) ≠ 0)
45	9, 10	cphdivcl 24690	. . . . . . 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 1372	. . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))) ∈ 𝐾)
47		cnfldmul 20942	. . . . . . 7 ⊢ · = (._r‘ℂ_fld)
48	47	subrgmcl 20367	. . . . . 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 1371	. . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) ∈ 𝐾)
50	15, 49	sseldd 3982	. . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) ∈ ℂ)
51		eqid 2732	. . . . . . 7 ⊢ ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) = ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))
52	51	sqreulem 15302	. . . . . 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 584	. . . . 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 1142	. . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))↑2) = 𝐴)
55	53	simp2d 1143	. . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → 0 ≤ (ℜ‘((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))))
56	53	simp3d 1144	. . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (i · ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴))))) ∉ ℝ⁺)
57		df-nel 3047	. . . . 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 15310	. . 3 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → ((√‘(abs‘𝐴)) · (((abs‘𝐴) + 𝐴) / (abs‘((abs‘𝐴) + 𝐴)))) = (√‘𝐴))
60	59, 49	eqeltrrd 2834	. 2 ⊢ (((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) ∧ 𝐴 ≠ 0) → (√‘𝐴) ∈ 𝐾)
61	7, 60	pm2.61dane 3029	1 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ⁺) → (√‘𝐴) ∈ 𝐾)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ∉ wnel 3046 ⊆ wss 3947 class class class wbr 5147 ‘cfv 6540 (class class class)co 7405 ℂcc 11104 ℝcr 11105 0cc0 11106 ici 11108 + caddc 11109 · cmul 11111 ≤ cle 11245 − cmin 11440 -cneg 11441 / cdiv 11867 2c2 12263 ℝ⁺crp 12970 ↑cexp 14023 ℜcre 15040 √csqrt 15176 abscabs 15177 Basecbs 17140 Scalarcsca 17196 SubRingcsubrg 20351 ℂ_fldccnfld 20936 ℂPreHilccph 24674

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184 ax-addf 11185 ax-mulf 11186

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-tp 4632 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-1st 7971 df-2nd 7972 df-tpos 8207 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-er 8699 df-map 8818 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-sup 9433 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-3 12272 df-4 12273 df-5 12274 df-6 12275 df-7 12276 df-8 12277 df-9 12278 df-n0 12469 df-z 12555 df-dec 12674 df-uz 12819 df-rp 12971 df-ico 13326 df-fz 13481 df-seq 13963 df-exp 14024 df-cj 15042 df-re 15043 df-im 15044 df-sqrt 15178 df-abs 15179 df-struct 17076 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17141 df-ress 17170 df-plusg 17206 df-mulr 17207 df-starv 17208 df-tset 17212 df-ple 17213 df-ds 17215 df-unif 17216 df-0g 17383 df-mgm 18557 df-sgrp 18606 df-mnd 18622 df-mhm 18667 df-grp 18818 df-minusg 18819 df-subg 18997 df-ghm 19084 df-cmn 19644 df-mgp 19982 df-ur 19999 df-ring 20051 df-cring 20052 df-oppr 20142 df-dvdsr 20163 df-unit 20164 df-invr 20194 df-dvr 20207 df-rnghom 20243 df-drng 20309 df-subrg 20353 df-staf 20445 df-srng 20446 df-lvec 20706 df-cnfld 20937 df-phl 21170 df-cph 24676

This theorem is referenced by: cphsqrtcl3 24695

W3C validator