sqsscirc1 - Mathbox for Thierry Arnoux

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Theorem sqsscirc1 33550

Description: The complex square of side 𝐷 is a subset of the complex circle of radius 𝐷. (Contributed by Thierry Arnoux, 25-Sep-2017.)

**Assertion**
Ref	Expression
sqsscirc1	⊢ ((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) → ((𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2)) → (√‘((𝑋↑2) + (𝑌↑2))) < 𝐷))

**Proof of Theorem sqsscirc1**
Step	Hyp	Ref	Expression
1		simp-4l 781	. . . . . 6 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 𝑋 ∈ ℝ)
2	1	resqcld 14131	. . . . 5 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (𝑋↑2) ∈ ℝ)
3		simpllr 774	. . . . . . 7 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌))
4	3	simpld 493	. . . . . 6 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 𝑌 ∈ ℝ)
5	4	resqcld 14131	. . . . 5 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (𝑌↑2) ∈ ℝ)
6	2, 5	readdcld 11283	. . . 4 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → ((𝑋↑2) + (𝑌↑2)) ∈ ℝ)
7	1	sqge0d 14143	. . . . 5 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 0 ≤ (𝑋↑2))
8	4	sqge0d 14143	. . . . 5 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 0 ≤ (𝑌↑2))
9	2, 5, 7, 8	addge0d 11830	. . . 4 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 0 ≤ ((𝑋↑2) + (𝑌↑2)))
10	6, 9	resqrtcld 15406	. . 3 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (√‘((𝑋↑2) + (𝑌↑2))) ∈ ℝ)
11		simplr 767	. . . . . . . 8 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 𝐷 ∈ ℝ⁺)
12	11	rpred 13058	. . . . . . 7 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 𝐷 ∈ ℝ)
13	12	rehalfcld 12499	. . . . . 6 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (𝐷 / 2) ∈ ℝ)
14	13	resqcld 14131	. . . . 5 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → ((𝐷 / 2)↑2) ∈ ℝ)
15	14, 14	readdcld 11283	. . . 4 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (((𝐷 / 2)↑2) + ((𝐷 / 2)↑2)) ∈ ℝ)
16	13	sqge0d 14143	. . . . 5 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 0 ≤ ((𝐷 / 2)↑2))
17	14, 14, 16, 16	addge0d 11830	. . . 4 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 0 ≤ (((𝐷 / 2)↑2) + ((𝐷 / 2)↑2)))
18	15, 17	resqrtcld 15406	. . 3 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (√‘(((𝐷 / 2)↑2) + ((𝐷 / 2)↑2))) ∈ ℝ)
19		simprl 769	. . . . . 6 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 𝑋 < (𝐷 / 2))
20		simp-4r 782	. . . . . . 7 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 0 ≤ 𝑋)
21		2rp 13021	. . . . . . . . 9 ⊢ 2 ∈ ℝ⁺
22	21	a1i 11	. . . . . . . 8 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 2 ∈ ℝ⁺)
23	11	rpge0d 13062	. . . . . . . 8 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 0 ≤ 𝐷)
24	12, 22, 23	divge0d 13098	. . . . . . 7 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 0 ≤ (𝐷 / 2))
25	1, 13, 20, 24	lt2sqd 14260	. . . . . 6 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (𝑋 < (𝐷 / 2) ↔ (𝑋↑2) < ((𝐷 / 2)↑2)))
26	19, 25	mpbid 231	. . . . 5 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (𝑋↑2) < ((𝐷 / 2)↑2))
27		simprr 771	. . . . . 6 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 𝑌 < (𝐷 / 2))
28	3	simprd 494	. . . . . . 7 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → 0 ≤ 𝑌)
29	4, 13, 28, 24	lt2sqd 14260	. . . . . 6 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (𝑌 < (𝐷 / 2) ↔ (𝑌↑2) < ((𝐷 / 2)↑2)))
30	27, 29	mpbid 231	. . . . 5 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (𝑌↑2) < ((𝐷 / 2)↑2))
31	2, 5, 14, 14, 26, 30	lt2addd 11877	. . . 4 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → ((𝑋↑2) + (𝑌↑2)) < (((𝐷 / 2)↑2) + ((𝐷 / 2)↑2)))
32	6, 9, 15, 17	sqrtltd 15416	. . . 4 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (((𝑋↑2) + (𝑌↑2)) < (((𝐷 / 2)↑2) + ((𝐷 / 2)↑2)) ↔ (√‘((𝑋↑2) + (𝑌↑2))) < (√‘(((𝐷 / 2)↑2) + ((𝐷 / 2)↑2)))))
33	31, 32	mpbid 231	. . 3 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (√‘((𝑋↑2) + (𝑌↑2))) < (√‘(((𝐷 / 2)↑2) + ((𝐷 / 2)↑2))))
34		rpre 13024	. . . . . . . . . . 11 ⊢ (𝐷 ∈ ℝ⁺ → 𝐷 ∈ ℝ)
35	34	rehalfcld 12499	. . . . . . . . . 10 ⊢ (𝐷 ∈ ℝ⁺ → (𝐷 / 2) ∈ ℝ)
36	35	resqcld 14131	. . . . . . . . 9 ⊢ (𝐷 ∈ ℝ⁺ → ((𝐷 / 2)↑2) ∈ ℝ)
37	36	recnd 11282	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ⁺ → ((𝐷 / 2)↑2) ∈ ℂ)
38	37	2timesd 12495	. . . . . . 7 ⊢ (𝐷 ∈ ℝ⁺ → (2 · ((𝐷 / 2)↑2)) = (((𝐷 / 2)↑2) + ((𝐷 / 2)↑2)))
39	38	fveq2d 6906	. . . . . 6 ⊢ (𝐷 ∈ ℝ⁺ → (√‘(2 · ((𝐷 / 2)↑2))) = (√‘(((𝐷 / 2)↑2) + ((𝐷 / 2)↑2))))
40	21	a1i 11	. . . . . . . . . 10 ⊢ (𝐷 ∈ ℝ⁺ → 2 ∈ ℝ⁺)
41		rpge0 13029	. . . . . . . . . 10 ⊢ (𝐷 ∈ ℝ⁺ → 0 ≤ 𝐷)
42	34, 40, 41	divge0d 13098	. . . . . . . . 9 ⊢ (𝐷 ∈ ℝ⁺ → 0 ≤ (𝐷 / 2))
43	35, 42	sqrtsqd 15408	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ⁺ → (√‘((𝐷 / 2)↑2)) = (𝐷 / 2))
44	43	oveq2d 7442	. . . . . . 7 ⊢ (𝐷 ∈ ℝ⁺ → ((√‘2) · (√‘((𝐷 / 2)↑2))) = ((√‘2) · (𝐷 / 2)))
45		2re 12326	. . . . . . . . 9 ⊢ 2 ∈ ℝ
46	45	a1i 11	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ⁺ → 2 ∈ ℝ)
47		0le2 12354	. . . . . . . . 9 ⊢ 0 ≤ 2
48	47	a1i 11	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ⁺ → 0 ≤ 2)
49	35	sqge0d 14143	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ⁺ → 0 ≤ ((𝐷 / 2)↑2))
50	46, 48, 36, 49	sqrtmuld 15413	. . . . . . 7 ⊢ (𝐷 ∈ ℝ⁺ → (√‘(2 · ((𝐷 / 2)↑2))) = ((√‘2) · (√‘((𝐷 / 2)↑2))))
51		2cnd 12330	. . . . . . . . 9 ⊢ (𝐷 ∈ ℝ⁺ → 2 ∈ ℂ)
52	51	sqrtcld 15426	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ⁺ → (√‘2) ∈ ℂ)
53		rpcn 13026	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ⁺ → 𝐷 ∈ ℂ)
54		2ne0 12356	. . . . . . . . 9 ⊢ 2 ≠ 0
55	54	a1i 11	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ⁺ → 2 ≠ 0)
56	52, 51, 53, 55	div32d 12053	. . . . . . 7 ⊢ (𝐷 ∈ ℝ⁺ → (((√‘2) / 2) · 𝐷) = ((√‘2) · (𝐷 / 2)))
57	44, 50, 56	3eqtr4d 2778	. . . . . 6 ⊢ (𝐷 ∈ ℝ⁺ → (√‘(2 · ((𝐷 / 2)↑2))) = (((√‘2) / 2) · 𝐷))
58	39, 57	eqtr3d 2770	. . . . 5 ⊢ (𝐷 ∈ ℝ⁺ → (√‘(((𝐷 / 2)↑2) + ((𝐷 / 2)↑2))) = (((√‘2) / 2) · 𝐷))
59		2lt4 12427	. . . . . . . . . 10 ⊢ 2 < 4
60		4re 12336	. . . . . . . . . . 11 ⊢ 4 ∈ ℝ
61		0re 11256	. . . . . . . . . . . 12 ⊢ 0 ∈ ℝ
62		4pos 12359	. . . . . . . . . . . 12 ⊢ 0 < 4
63	61, 60, 62	ltleii 11377	. . . . . . . . . . 11 ⊢ 0 ≤ 4
64		sqrtlt 15250	. . . . . . . . . . 11 ⊢ (((2 ∈ ℝ ∧ 0 ≤ 2) ∧ (4 ∈ ℝ ∧ 0 ≤ 4)) → (2 < 4 ↔ (√‘2) < (√‘4)))
65	45, 47, 60, 63, 64	mp4an 691	. . . . . . . . . 10 ⊢ (2 < 4 ↔ (√‘2) < (√‘4))
66	59, 65	mpbi 229	. . . . . . . . 9 ⊢ (√‘2) < (√‘4)
67		2pos 12355	. . . . . . . . . . 11 ⊢ 0 < 2
68	45, 67	sqrtpclii 15371	. . . . . . . . . 10 ⊢ (√‘2) ∈ ℝ
69	60, 62	sqrtpclii 15371	. . . . . . . . . 10 ⊢ (√‘4) ∈ ℝ
70	68, 69, 45, 67	ltdiv1ii 12183	. . . . . . . . 9 ⊢ ((√‘2) < (√‘4) ↔ ((√‘2) / 2) < ((√‘4) / 2))
71	66, 70	mpbi 229	. . . . . . . 8 ⊢ ((√‘2) / 2) < ((√‘4) / 2)
72		sqrtsq 15258	. . . . . . . . . . 11 ⊢ ((2 ∈ ℝ ∧ 0 ≤ 2) → (√‘(2↑2)) = 2)
73	45, 47, 72	mp2an 690	. . . . . . . . . 10 ⊢ (√‘(2↑2)) = 2
74	73	oveq1i 7436	. . . . . . . . 9 ⊢ ((√‘(2↑2)) / 2) = (2 / 2)
75		sq2 14202	. . . . . . . . . . 11 ⊢ (2↑2) = 4
76	75	fveq2i 6905	. . . . . . . . . 10 ⊢ (√‘(2↑2)) = (√‘4)
77	76	oveq1i 7436	. . . . . . . . 9 ⊢ ((√‘(2↑2)) / 2) = ((√‘4) / 2)
78		2div2e1 12393	. . . . . . . . 9 ⊢ (2 / 2) = 1
79	74, 77, 78	3eqtr3i 2764	. . . . . . . 8 ⊢ ((√‘4) / 2) = 1
80	71, 79	breqtri 5177	. . . . . . 7 ⊢ ((√‘2) / 2) < 1
81	46, 48	resqrtcld 15406	. . . . . . . . 9 ⊢ (𝐷 ∈ ℝ⁺ → (√‘2) ∈ ℝ)
82	81	rehalfcld 12499	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ⁺ → ((√‘2) / 2) ∈ ℝ)
83		1red 11255	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ⁺ → 1 ∈ ℝ)
84		id 22	. . . . . . . 8 ⊢ (𝐷 ∈ ℝ⁺ → 𝐷 ∈ ℝ⁺)
85	82, 83, 84	ltmul1d 13099	. . . . . . 7 ⊢ (𝐷 ∈ ℝ⁺ → (((√‘2) / 2) < 1 ↔ (((√‘2) / 2) · 𝐷) < (1 · 𝐷)))
86	80, 85	mpbii 232	. . . . . 6 ⊢ (𝐷 ∈ ℝ⁺ → (((√‘2) / 2) · 𝐷) < (1 · 𝐷))
87	53	mullidd 11272	. . . . . 6 ⊢ (𝐷 ∈ ℝ⁺ → (1 · 𝐷) = 𝐷)
88	86, 87	breqtrd 5178	. . . . 5 ⊢ (𝐷 ∈ ℝ⁺ → (((√‘2) / 2) · 𝐷) < 𝐷)
89	58, 88	eqbrtrd 5174	. . . 4 ⊢ (𝐷 ∈ ℝ⁺ → (√‘(((𝐷 / 2)↑2) + ((𝐷 / 2)↑2))) < 𝐷)
90	11, 89	syl 17	. . 3 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (√‘(((𝐷 / 2)↑2) + ((𝐷 / 2)↑2))) < 𝐷)
91	10, 18, 12, 33, 90	lttrd 11415	. 2 ⊢ (((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) ∧ (𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2))) → (√‘((𝑋↑2) + (𝑌↑2))) < 𝐷)
92	91	ex 411	1 ⊢ ((((𝑋 ∈ ℝ ∧ 0 ≤ 𝑋) ∧ (𝑌 ∈ ℝ ∧ 0 ≤ 𝑌)) ∧ 𝐷 ∈ ℝ⁺) → ((𝑋 < (𝐷 / 2) ∧ 𝑌 < (𝐷 / 2)) → (√‘((𝑋↑2) + (𝑌↑2))) < 𝐷))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 = wceq 1533 ∈ wcel 2098 ≠ wne 2937 class class class wbr 5152 ‘cfv 6553 (class class class)co 7426 ℝcr 11147 0cc0 11148 1c1 11149 + caddc 11151 · cmul 11153 < clt 11288 ≤ cle 11289 / cdiv 11911 2c2 12307 4c4 12309 ℝ⁺crp 13016 ↑cexp 14068 √csqrt 15222

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 2699 ax-sep 5303 ax-nul 5310 ax-pow 5369 ax-pr 5433 ax-un 7748 ax-cnex 11204 ax-resscn 11205 ax-1cn 11206 ax-icn 11207 ax-addcl 11208 ax-addrcl 11209 ax-mulcl 11210 ax-mulrcl 11211 ax-mulcom 11212 ax-addass 11213 ax-mulass 11214 ax-distr 11215 ax-i2m1 11216 ax-1ne0 11217 ax-1rid 11218 ax-rnegex 11219 ax-rrecex 11220 ax-cnre 11221 ax-pre-lttri 11222 ax-pre-lttrn 11223 ax-pre-ltadd 11224 ax-pre-mulgt0 11225 ax-pre-sup 11226

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 2529 df-eu 2558 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4327 df-if 4533 df-pw 4608 df-sn 4633 df-pr 4635 df-op 4639 df-uni 4913 df-iun 5002 df-br 5153 df-opab 5215 df-mpt 5236 df-tr 5270 df-id 5580 df-eprel 5586 df-po 5594 df-so 5595 df-fr 5637 df-we 5639 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-pred 6310 df-ord 6377 df-on 6378 df-lim 6379 df-suc 6380 df-iota 6505 df-fun 6555 df-fn 6556 df-f 6557 df-f1 6558 df-fo 6559 df-f1o 6560 df-fv 6561 df-riota 7382 df-ov 7429 df-oprab 7430 df-mpo 7431 df-om 7879 df-2nd 8002 df-frecs 8295 df-wrecs 8326 df-recs 8400 df-rdg 8439 df-er 8733 df-en 8973 df-dom 8974 df-sdom 8975 df-sup 9475 df-pnf 11290 df-mnf 11291 df-xr 11292 df-ltxr 11293 df-le 11294 df-sub 11486 df-neg 11487 df-div 11912 df-nn 12253 df-2 12315 df-3 12316 df-4 12317 df-n0 12513 df-z 12599 df-uz 12863 df-rp 13017 df-seq 14009 df-exp 14069 df-cj 15088 df-re 15089 df-im 15090 df-sqrt 15224 df-abs 15225

This theorem is referenced by: sqsscirc2 33551

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