dpmul - Mathbox for Thierry Arnoux

	Mathbox for Thierry Arnoux		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > Mathboxes > dpmul		Structured version Visualization version GIF version

Theorem dpmul 33366

Description: Multiplication with one decimal point. (Contributed by Thierry Arnoux, 26-Dec-2021.)

**Hypotheses**
Ref	Expression
dpmul.a	⊢ 𝐴 ∈ ℕ₀
dpmul.b	⊢ 𝐵 ∈ ℕ₀
dpmul.c	⊢ 𝐶 ∈ ℕ₀
dpmul.d	⊢ 𝐷 ∈ ℕ₀
dpmul.e	⊢ 𝐸 ∈ ℕ₀
dpmul.g	⊢ 𝐺 ∈ ℕ₀
dpmul.j	⊢ 𝐽 ∈ ℕ₀
dpmul.k	⊢ 𝐾 ∈ ℕ₀
dpmul.1	⊢ (𝐴 · 𝐶) = 𝐹
dpmul.2	⊢ (𝐴 · 𝐷) = 𝑀
dpmul.3	⊢ (𝐵 · 𝐶) = 𝐿
dpmul.4	⊢ (𝐵 · 𝐷) = ;𝐸𝐾
dpmul.5	⊢ ((𝐿 + 𝑀) + 𝐸) = ;𝐺𝐽
dpmul.6	⊢ (𝐹 + 𝐺) = 𝐼

**Assertion**
Ref	Expression
dpmul	⊢ ((𝐴.𝐵) · (𝐶.𝐷)) = (𝐼._𝐽𝐾)

**Proof of Theorem dpmul**
Step	Hyp	Ref	Expression
1		dpmul.a	. . . . 5 ⊢ 𝐴 ∈ ℕ₀
2		dpmul.b	. . . . 5 ⊢ 𝐵 ∈ ℕ₀
3	1, 2	deccl 12755	. . . 4 ⊢ ;𝐴𝐵 ∈ ℕ₀
4		dpmul.c	. . . 4 ⊢ 𝐶 ∈ ℕ₀
5		dpmul.d	. . . 4 ⊢ 𝐷 ∈ ℕ₀
6		eqid 2762	. . . 4 ⊢ ;𝐶𝐷 = ;𝐶𝐷
7		dpmul.k	. . . 4 ⊢ 𝐾 ∈ ℕ₀
8		dpmul.2	. . . . . 6 ⊢ (𝐴 · 𝐷) = 𝑀
9	1, 5	nn0mulcli 12570	. . . . . 6 ⊢ (𝐴 · 𝐷) ∈ ℕ₀
10	8, 9	eqeltrri 2859	. . . . 5 ⊢ 𝑀 ∈ ℕ₀
11		dpmul.e	. . . . 5 ⊢ 𝐸 ∈ ℕ₀
12	10, 11	nn0addcli 12569	. . . 4 ⊢ (𝑀 + 𝐸) ∈ ℕ₀
13		eqid 2762	. . . . . . 7 ⊢ ;𝐴𝐵 = ;𝐴𝐵
14		dpmul.1	. . . . . . 7 ⊢ (𝐴 · 𝐶) = 𝐹
15		dpmul.3	. . . . . . 7 ⊢ (𝐵 · 𝐶) = 𝐿
16	4, 1, 2, 13, 14, 15	decmul1 12809	. . . . . 6 ⊢ (;𝐴𝐵 · 𝐶) = ;𝐹𝐿
17	16	oveq1i 7427	. . . . 5 ⊢ ((;𝐴𝐵 · 𝐶) + (𝑀 + 𝐸)) = (;𝐹𝐿 + (𝑀 + 𝐸))
18		dfdec10 12743	. . . . . 6 ⊢ ;𝐹𝐿 = ((;10 · 𝐹) + 𝐿)
19	18	oveq1i 7427	. . . . 5 ⊢ (;𝐹𝐿 + (𝑀 + 𝐸)) = (((;10 · 𝐹) + 𝐿) + (𝑀 + 𝐸))
20		10nn0 12762	. . . . . . . . 9 ⊢ ;10 ∈ ℕ₀
21	20	nn0cni 12544	. . . . . . . 8 ⊢ ;10 ∈ ℂ
22	1, 4	nn0mulcli 12570	. . . . . . . . . 10 ⊢ (𝐴 · 𝐶) ∈ ℕ₀
23	14, 22	eqeltrri 2859	. . . . . . . . 9 ⊢ 𝐹 ∈ ℕ₀
24	23	nn0cni 12544	. . . . . . . 8 ⊢ 𝐹 ∈ ℂ
25	21, 24	mulcli 11244	. . . . . . 7 ⊢ (;10 · 𝐹) ∈ ℂ
26	2, 4	nn0mulcli 12570	. . . . . . . . 9 ⊢ (𝐵 · 𝐶) ∈ ℕ₀
27	15, 26	eqeltrri 2859	. . . . . . . 8 ⊢ 𝐿 ∈ ℕ₀
28	27	nn0cni 12544	. . . . . . 7 ⊢ 𝐿 ∈ ℂ
29	12	nn0cni 12544	. . . . . . 7 ⊢ (𝑀 + 𝐸) ∈ ℂ
30	25, 28, 29	addassi 11247	. . . . . 6 ⊢ (((;10 · 𝐹) + 𝐿) + (𝑀 + 𝐸)) = ((;10 · 𝐹) + (𝐿 + (𝑀 + 𝐸)))
31		dpmul.5	. . . . . . . 8 ⊢ ((𝐿 + 𝑀) + 𝐸) = ;𝐺𝐽
32	10	nn0cni 12544	. . . . . . . . 9 ⊢ 𝑀 ∈ ℂ
33	11	nn0cni 12544	. . . . . . . . 9 ⊢ 𝐸 ∈ ℂ
34	28, 32, 33	addassi 11247	. . . . . . . 8 ⊢ ((𝐿 + 𝑀) + 𝐸) = (𝐿 + (𝑀 + 𝐸))
35		dfdec10 12743	. . . . . . . 8 ⊢ ;𝐺𝐽 = ((;10 · 𝐺) + 𝐽)
36	31, 34, 35	3eqtr3ri 2794	. . . . . . 7 ⊢ ((;10 · 𝐺) + 𝐽) = (𝐿 + (𝑀 + 𝐸))
37	36	oveq2i 7428	. . . . . 6 ⊢ ((;10 · 𝐹) + ((;10 · 𝐺) + 𝐽)) = ((;10 · 𝐹) + (𝐿 + (𝑀 + 𝐸)))
38		dfdec10 12743	. . . . . . 7 ⊢ ;𝐼𝐽 = ((;10 · 𝐼) + 𝐽)
39		dpmul.g	. . . . . . . . . . 11 ⊢ 𝐺 ∈ ℕ₀
40	39	nn0cni 12544	. . . . . . . . . 10 ⊢ 𝐺 ∈ ℂ
41	21, 24, 40	adddii 11249	. . . . . . . . 9 ⊢ (;10 · (𝐹 + 𝐺)) = ((;10 · 𝐹) + (;10 · 𝐺))
42		dpmul.6	. . . . . . . . . 10 ⊢ (𝐹 + 𝐺) = 𝐼
43	42	oveq2i 7428	. . . . . . . . 9 ⊢ (;10 · (𝐹 + 𝐺)) = (;10 · 𝐼)
44	41, 43	eqtr3i 2787	. . . . . . . 8 ⊢ ((;10 · 𝐹) + (;10 · 𝐺)) = (;10 · 𝐼)
45	44	oveq1i 7427	. . . . . . 7 ⊢ (((;10 · 𝐹) + (;10 · 𝐺)) + 𝐽) = ((;10 · 𝐼) + 𝐽)
46	21, 40	mulcli 11244	. . . . . . . 8 ⊢ (;10 · 𝐺) ∈ ℂ
47		dpmul.j	. . . . . . . . 9 ⊢ 𝐽 ∈ ℕ₀
48	47	nn0cni 12544	. . . . . . . 8 ⊢ 𝐽 ∈ ℂ
49	25, 46, 48	addassi 11247	. . . . . . 7 ⊢ (((;10 · 𝐹) + (;10 · 𝐺)) + 𝐽) = ((;10 · 𝐹) + ((;10 · 𝐺) + 𝐽))
50	38, 45, 49	3eqtr2ri 2792	. . . . . 6 ⊢ ((;10 · 𝐹) + ((;10 · 𝐺) + 𝐽)) = ;𝐼𝐽
51	30, 37, 50	3eqtr2i 2791	. . . . 5 ⊢ (((;10 · 𝐹) + 𝐿) + (𝑀 + 𝐸)) = ;𝐼𝐽
52	17, 19, 51	3eqtri 2789	. . . 4 ⊢ ((;𝐴𝐵 · 𝐶) + (𝑀 + 𝐸)) = ;𝐼𝐽
53	8	oveq1i 7427	. . . . 5 ⊢ ((𝐴 · 𝐷) + 𝐸) = (𝑀 + 𝐸)
54		dpmul.4	. . . . 5 ⊢ (𝐵 · 𝐷) = ;𝐸𝐾
55	5, 1, 2, 13, 7, 11, 53, 54	decmul1c 12810	. . . 4 ⊢ (;𝐴𝐵 · 𝐷) = ;(𝑀 + 𝐸)𝐾
56	3, 4, 5, 6, 7, 12, 52, 55	decmul2c 12811	. . 3 ⊢ (;𝐴𝐵 · ;𝐶𝐷) = ;;𝐼𝐽𝐾
57	2	nn0rei 12543	. . . . . . 7 ⊢ 𝐵 ∈ ℝ
58		dpcl 33344	. . . . . . 7 ⊢ ((𝐴 ∈ ℕ₀ ∧ 𝐵 ∈ ℝ) → (𝐴.𝐵) ∈ ℝ)
59	1, 57, 58	mp2an 705	. . . . . 6 ⊢ (𝐴.𝐵) ∈ ℝ
60	59	recni 11251	. . . . 5 ⊢ (𝐴.𝐵) ∈ ℂ
61	5	nn0rei 12543	. . . . . . 7 ⊢ 𝐷 ∈ ℝ
62		dpcl 33344	. . . . . . 7 ⊢ ((𝐶 ∈ ℕ₀ ∧ 𝐷 ∈ ℝ) → (𝐶.𝐷) ∈ ℝ)
63	4, 61, 62	mp2an 705	. . . . . 6 ⊢ (𝐶.𝐷) ∈ ℝ
64	63	recni 11251	. . . . 5 ⊢ (𝐶.𝐷) ∈ ℂ
65	60, 64, 21, 21	mul4i 11435	. . . 4 ⊢ (((𝐴.𝐵) · (𝐶.𝐷)) · (;10 · ;10)) = (((𝐴.𝐵) · ;10) · ((𝐶.𝐷) · ;10))
66	20	dec0u 12766	. . . . 5 ⊢ (;10 · ;10) = ;;100
67	66	oveq2i 7428	. . . 4 ⊢ (((𝐴.𝐵) · (𝐶.𝐷)) · (;10 · ;10)) = (((𝐴.𝐵) · (𝐶.𝐷)) · ;;100)
68	1, 57	dpmul10 33348	. . . . 5 ⊢ ((𝐴.𝐵) · ;10) = ;𝐴𝐵
69	4, 61	dpmul10 33348	. . . . 5 ⊢ ((𝐶.𝐷) · ;10) = ;𝐶𝐷
70	68, 69	oveq12i 7429	. . . 4 ⊢ (((𝐴.𝐵) · ;10) · ((𝐶.𝐷) · ;10)) = (;𝐴𝐵 · ;𝐶𝐷)
71	65, 67, 70	3eqtr3i 2793	. . 3 ⊢ (((𝐴.𝐵) · (𝐶.𝐷)) · ;;100) = (;𝐴𝐵 · ;𝐶𝐷)
72	23, 39	nn0addcli 12569	. . . . 5 ⊢ (𝐹 + 𝐺) ∈ ℕ₀
73	42, 72	eqeltrri 2859	. . . 4 ⊢ 𝐼 ∈ ℕ₀
74	7	nn0rei 12543	. . . 4 ⊢ 𝐾 ∈ ℝ
75	73, 47, 74	dpmul100 33350	. . 3 ⊢ ((𝐼._𝐽𝐾) · ;;100) = ;;𝐼𝐽𝐾
76	56, 71, 75	3eqtr4i 2795	. 2 ⊢ (((𝐴.𝐵) · (𝐶.𝐷)) · ;;100) = ((𝐼._𝐽𝐾) · ;;100)
77	60, 64	mulcli 11244	. . 3 ⊢ ((𝐴.𝐵) · (𝐶.𝐷)) ∈ ℂ
78	47	nn0rei 12543	. . . . . 6 ⊢ 𝐽 ∈ ℝ
79		dp2cl 33333	. . . . . 6 ⊢ ((𝐽 ∈ ℝ ∧ 𝐾 ∈ ℝ) → _𝐽𝐾 ∈ ℝ)
80	78, 74, 79	mp2an 705	. . . . 5 ⊢ _𝐽𝐾 ∈ ℝ
81		dpcl 33344	. . . . 5 ⊢ ((𝐼 ∈ ℕ₀ ∧ _𝐽𝐾 ∈ ℝ) → (𝐼._𝐽𝐾) ∈ ℝ)
82	73, 80, 81	mp2an 705	. . . 4 ⊢ (𝐼._𝐽𝐾) ∈ ℝ
83	82	recni 11251	. . 3 ⊢ (𝐼._𝐽𝐾) ∈ ℂ
84		10nn 12760	. . . . . 6 ⊢ ;10 ∈ ℕ
85	84	decnncl2 12769	. . . . 5 ⊢ ;;100 ∈ ℕ
86	85	nncni 12271	. . . 4 ⊢ ;;100 ∈ ℂ
87	85	nnne0i 12304	. . . 4 ⊢ ;;100 ≠ 0
88	86, 87	pm3.2i 476	. . 3 ⊢ (;;100 ∈ ℂ ∧ ;;100 ≠ 0)
89		mulcan2 11880	. . 3 ⊢ ((((𝐴.𝐵) · (𝐶.𝐷)) ∈ ℂ ∧ (𝐼._𝐽𝐾) ∈ ℂ ∧ (;;100 ∈ ℂ ∧ ;;100 ≠ 0)) → ((((𝐴.𝐵) · (𝐶.𝐷)) · ;;100) = ((𝐼._𝐽𝐾) · ;;100) ↔ ((𝐴.𝐵) · (𝐶.𝐷)) = (𝐼._𝐽𝐾)))
90	77, 83, 88, 89	mp3an 1490	. 2 ⊢ ((((𝐴.𝐵) · (𝐶.𝐷)) · ;;100) = ((𝐼._𝐽𝐾) · ;;100) ↔ ((𝐴.𝐵) · (𝐶.𝐷)) = (𝐼._𝐽𝐾))
91	76, 90	mpbi 233	1 ⊢ ((𝐴.𝐵) · (𝐶.𝐷)) = (𝐼._𝐽𝐾)

Colors of variables: wff setvar class

This proof depends on syntax axioms: ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ≠ wne 2957 (class class class)co 7417 ℂcc 11126 ℝcr 11127 0cc0 11128 1c1 11129 + caddc 11131 · cmul 11133 ℕ₀cn0 12532 cdc 12740 cdp2 33324 .cdp 33341

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7740 ax-resscn 11185 ax-1cn 11186 ax-icn 11187 ax-addcl 11188 ax-addrcl 11189 ax-mulcl 11190 ax-mulrcl 11191 ax-mulcom 11192 ax-addass 11193 ax-mulass 11194 ax-distr 11195 ax-i2m1 11196 ax-1ne0 11197 ax-1rid 11198 ax-rnegex 11199 ax-rrecex 11200 ax-cnre 11201 ax-pre-lttri 11202 ax-pre-lttrn 11203 ax-pre-ltadd 11204 ax-pre-mulgt0 11205

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3367 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7374 df-ov 7420 df-oprab 7421 df-mpo 7422 df-om 7867 df-2nd 7991 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-er 8700 df-en 8957 df-dom 8958 df-sdom 8959 df-pnf 11273 df-mnf 11274 df-xr 11275 df-ltxr 11276 df-le 11277 df-sub 11471 df-neg 11472 df-div 11900 df-nn 12262 df-2 12331 df-3 12332 df-4 12333 df-5 12334 df-6 12335 df-7 12336 df-8 12337 df-9 12338 df-n0 12533 df-dec 12741 df-dp2 33325 df-dp 33342

This theorem is used by: hgt750lem2 35168

W3C validator