3cubeslem1 - Mathbox for Igor Ieskov

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Theorem 3cubeslem1 42672

Description: Lemma for 3cubes 42678. (Contributed by Igor Ieskov, 22-Jan-2024.)

**Hypothesis**
Ref	Expression
3cubeslem1.a	⊢ (𝜑 → 𝐴 ∈ ℚ)

**Assertion**
Ref	Expression
3cubeslem1	⊢ (𝜑 → 0 < (((𝐴 + 1)↑2) − 𝐴))

**Proof of Theorem 3cubeslem1**
Step	Hyp	Ref	Expression
1		3cubeslem1.a	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ ℚ)
2		qre 12912	. . . . 5 ⊢ (𝐴 ∈ ℚ → 𝐴 ∈ ℝ)
3	1, 2	syl 17	. . . 4 ⊢ (𝜑 → 𝐴 ∈ ℝ)
4		0red 11177	. . . 4 ⊢ (𝜑 → 0 ∈ ℝ)
5	3, 4	lttri4d 11315	. . 3 ⊢ (𝜑 → (𝐴 < 0 ∨ 𝐴 = 0 ∨ 0 < 𝐴))
6		simpl 482	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 < 0) → 𝐴 ∈ ℝ)
7		0red 11177	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 < 0) → 0 ∈ ℝ)
8		peano2re 11347	. . . . . . . . 9 ⊢ (𝐴 ∈ ℝ → (𝐴 + 1) ∈ ℝ)
9	8	adantr 480	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 < 0) → (𝐴 + 1) ∈ ℝ)
10	9	resqcld 14090	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 < 0) → ((𝐴 + 1)↑2) ∈ ℝ)
11		simpr 484	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 < 0) → 𝐴 < 0)
12	9	sqge0d 14102	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 < 0) → 0 ≤ ((𝐴 + 1)↑2))
13	6, 7, 10, 11, 12	ltletrd 11334	. . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 < 0) → 𝐴 < ((𝐴 + 1)↑2))
14	13	a1i 11	. . . . 5 ⊢ (𝜑 → ((𝐴 ∈ ℝ ∧ 𝐴 < 0) → 𝐴 < ((𝐴 + 1)↑2)))
15	3, 14	mpand 695	. . . 4 ⊢ (𝜑 → (𝐴 < 0 → 𝐴 < ((𝐴 + 1)↑2)))
16		0lt1 11700	. . . . . . . 8 ⊢ 0 < 1
17	16	a1i 11	. . . . . . 7 ⊢ (𝐴 = 0 → 0 < 1)
18		id 22	. . . . . . 7 ⊢ (𝐴 = 0 → 𝐴 = 0)
19		sq1 14160	. . . . . . . 8 ⊢ (1↑2) = 1
20	19	a1i 11	. . . . . . 7 ⊢ (𝐴 = 0 → (1↑2) = 1)
21	17, 18, 20	3brtr4d 5139	. . . . . 6 ⊢ (𝐴 = 0 → 𝐴 < (1↑2))
22		0cnd 11167	. . . . . . . . 9 ⊢ (𝐴 = 0 → 0 ∈ ℂ)
23		1cnd 11169	. . . . . . . . 9 ⊢ (𝐴 = 0 → 1 ∈ ℂ)
24	18	oveq1d 7402	. . . . . . . . 9 ⊢ (𝐴 = 0 → (𝐴 + 1) = (0 + 1))
25	22, 23, 24	comraddd 11388	. . . . . . . 8 ⊢ (𝐴 = 0 → (𝐴 + 1) = (1 + 0))
26		1p0e1 12305	. . . . . . . 8 ⊢ (1 + 0) = 1
27	25, 26	eqtrdi 2780	. . . . . . 7 ⊢ (𝐴 = 0 → (𝐴 + 1) = 1)
28	27	oveq1d 7402	. . . . . 6 ⊢ (𝐴 = 0 → ((𝐴 + 1)↑2) = (1↑2))
29	21, 28	breqtrrd 5135	. . . . 5 ⊢ (𝐴 = 0 → 𝐴 < ((𝐴 + 1)↑2))
30	29	a1i 11	. . . 4 ⊢ (𝜑 → (𝐴 = 0 → 𝐴 < ((𝐴 + 1)↑2)))
31		ax-1rid 11138	. . . . . . . . 9 ⊢ (𝐴 ∈ ℝ → (𝐴 · 1) = 𝐴)
32	31	adantr 480	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → (𝐴 · 1) = 𝐴)
33		simpl 482	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 𝐴 ∈ ℝ)
34		1red 11175	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 1 ∈ ℝ)
35	33, 34	readdcld 11203	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → (𝐴 + 1) ∈ ℝ)
36		simpr 484	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 0 < 𝐴)
37		0red 11177	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 0 ∈ ℝ)
38		ltle 11262	. . . . . . . . . . . 12 ⊢ ((0 ∈ ℝ ∧ 𝐴 ∈ ℝ) → (0 < 𝐴 → 0 ≤ 𝐴))
39	37, 33, 38	syl2anc 584	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → (0 < 𝐴 → 0 ≤ 𝐴))
40	33	ltp1d 12113	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 𝐴 < (𝐴 + 1))
41	39, 40	jctird 526	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → (0 < 𝐴 → (0 ≤ 𝐴 ∧ 𝐴 < (𝐴 + 1))))
42	36, 41	mpd 15	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → (0 ≤ 𝐴 ∧ 𝐴 < (𝐴 + 1)))
43	34, 35	jca 511	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → (1 ∈ ℝ ∧ (𝐴 + 1) ∈ ℝ))
44		0le1 11701	. . . . . . . . . . 11 ⊢ 0 ≤ 1
45	44	a1i 11	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 0 ≤ 1)
46		1e0p1 12691	. . . . . . . . . . 11 ⊢ 1 = (0 + 1)
47	37, 33, 34, 36	ltadd1dd 11789	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → (0 + 1) < (𝐴 + 1))
48	46, 47	eqbrtrid 5142	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 1 < (𝐴 + 1))
49	43, 45, 48	jca32 515	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → ((1 ∈ ℝ ∧ (𝐴 + 1) ∈ ℝ) ∧ (0 ≤ 1 ∧ 1 < (𝐴 + 1))))
50		ltmul12a 12038	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ ∧ (𝐴 + 1) ∈ ℝ) ∧ (0 ≤ 𝐴 ∧ 𝐴 < (𝐴 + 1))) ∧ ((1 ∈ ℝ ∧ (𝐴 + 1) ∈ ℝ) ∧ (0 ≤ 1 ∧ 1 < (𝐴 + 1)))) → (𝐴 · 1) < ((𝐴 + 1) · (𝐴 + 1)))
51	33, 35, 42, 49, 50	syl1111anc 840	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → (𝐴 · 1) < ((𝐴 + 1) · (𝐴 + 1)))
52	32, 51	eqbrtrrd 5131	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 𝐴 < ((𝐴 + 1) · (𝐴 + 1)))
53	35	recnd 11202	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → (𝐴 + 1) ∈ ℂ)
54	53	sqvald 14108	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → ((𝐴 + 1)↑2) = ((𝐴 + 1) · (𝐴 + 1)))
55	52, 54	breqtrrd 5135	. . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 𝐴 < ((𝐴 + 1)↑2))
56	55	a1i 11	. . . . 5 ⊢ (𝜑 → ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 𝐴 < ((𝐴 + 1)↑2)))
57	3, 56	mpand 695	. . . 4 ⊢ (𝜑 → (0 < 𝐴 → 𝐴 < ((𝐴 + 1)↑2)))
58	15, 30, 57	3jaod 1431	. . 3 ⊢ (𝜑 → ((𝐴 < 0 ∨ 𝐴 = 0 ∨ 0 < 𝐴) → 𝐴 < ((𝐴 + 1)↑2)))
59	5, 58	mpd 15	. 2 ⊢ (𝜑 → 𝐴 < ((𝐴 + 1)↑2))
60	3, 8	syl 17	. . . 4 ⊢ (𝜑 → (𝐴 + 1) ∈ ℝ)
61	60	resqcld 14090	. . 3 ⊢ (𝜑 → ((𝐴 + 1)↑2) ∈ ℝ)
62	3, 61	posdifd 11765	. 2 ⊢ (𝜑 → (𝐴 < ((𝐴 + 1)↑2) ↔ 0 < (((𝐴 + 1)↑2) − 𝐴)))
63	59, 62	mpbid 232	1 ⊢ (𝜑 → 0 < (((𝐴 + 1)↑2) − 𝐴))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∨ w3o 1085 = wceq 1540 ∈ wcel 2109 class class class wbr 5107 (class class class)co 7387 ℝcr 11067 0cc0 11068 1c1 11069 + caddc 11071 · cmul 11073 < clt 11208 ≤ cle 11209 − cmin 11405 2c2 12241 ℚcq 12907 ↑cexp 14026

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5251 ax-nul 5261 ax-pow 5320 ax-pr 5387 ax-un 7711 ax-cnex 11124 ax-resscn 11125 ax-1cn 11126 ax-icn 11127 ax-addcl 11128 ax-addrcl 11129 ax-mulcl 11130 ax-mulrcl 11131 ax-mulcom 11132 ax-addass 11133 ax-mulass 11134 ax-distr 11135 ax-i2m1 11136 ax-1ne0 11137 ax-1rid 11138 ax-rnegex 11139 ax-rrecex 11140 ax-cnre 11141 ax-pre-lttri 11142 ax-pre-lttrn 11143 ax-pre-ltadd 11144 ax-pre-mulgt0 11145

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3354 df-reu 3355 df-rab 3406 df-v 3449 df-sbc 3754 df-csb 3863 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3934 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-iun 4957 df-br 5108 df-opab 5170 df-mpt 5189 df-tr 5215 df-id 5533 df-eprel 5538 df-po 5546 df-so 5547 df-fr 5591 df-we 5593 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-res 5650 df-ima 5651 df-pred 6274 df-ord 6335 df-on 6336 df-lim 6337 df-suc 6338 df-iota 6464 df-fun 6513 df-fn 6514 df-f 6515 df-f1 6516 df-fo 6517 df-f1o 6518 df-fv 6519 df-riota 7344 df-ov 7390 df-oprab 7391 df-mpo 7392 df-om 7843 df-1st 7968 df-2nd 7969 df-frecs 8260 df-wrecs 8291 df-recs 8340 df-rdg 8378 df-er 8671 df-en 8919 df-dom 8920 df-sdom 8921 df-pnf 11210 df-mnf 11211 df-xr 11212 df-ltxr 11213 df-le 11214 df-sub 11407 df-neg 11408 df-div 11836 df-nn 12187 df-2 12249 df-n0 12443 df-z 12530 df-uz 12794 df-q 12908 df-seq 13967 df-exp 14027

This theorem is referenced by: 3cubeslem2 42673

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