Theorem mulsunif2lem 28391

Description: Lemma for mulsunif2 28392. State the theorem with extra disjoint variable conditions. (Contributed by Scott Fenton, 16-Mar-2025.)

Hypotheses

Ref	Expression
mulsunif2.1	⊢ (𝜑 → 𝐿 <<s 𝑅)
mulsunif2.2	⊢ (𝜑 → 𝑀 <<s 𝑆)
mulsunif2.3	⊢ (𝜑 → 𝐴 = (𝐿 |s 𝑅))
mulsunif2.4	⊢ (𝜑 → 𝐵 = (𝑀 |s 𝑆))

Assertion

Ref	Expression
mulsunif2lem	⊢ (𝜑 → (𝐴 ·s 𝐵) = (({𝑎 ∣ ∃𝑝 ∈ 𝐿 ∃𝑞 ∈ 𝑀 𝑎 = ((𝐴 ·s 𝐵) -s ((𝐴 -s 𝑝) ·s (𝐵 -s 𝑞)))} ∪ {𝑏 ∣ ∃𝑟 ∈ 𝑅 ∃𝑠 ∈ 𝑆 𝑏 = ((𝐴 ·s 𝐵) -s ((𝑟 -s 𝐴) ·s (𝑠 -s 𝐵)))}) |s ({𝑐 ∣ ∃𝑡 ∈ 𝐿 ∃𝑢 ∈ 𝑆 𝑐 = ((𝐴 ·s 𝐵) +s ((𝐴 -s 𝑡) ·s (𝑢 -s 𝐵)))} ∪ {𝑑 ∣ ∃𝑣 ∈ 𝑅 ∃𝑤 ∈ 𝑀 𝑑 = ((𝐴 ·s 𝐵) +s ((𝑣 -s 𝐴) ·s (𝐵 -s 𝑤)))})))

Distinct variable groups:   𝐴,𝑎,𝑏,𝑐,𝑑,𝑝,𝑞,𝑟,𝑠,𝑡,𝑢,𝑣,𝑤   𝐵,𝑎,𝑏,𝑐,𝑑,𝑝,𝑞,𝑟,𝑠,𝑡,𝑢,𝑣,𝑤   𝐿,𝑎,𝑏,𝑐,𝑑,𝑝,𝑞,𝑟,𝑠,𝑡,𝑢,𝑣,𝑤   𝑅,𝑎,𝑏,𝑐,𝑑,𝑝,𝑞,𝑟,𝑠,𝑡,𝑢,𝑣,𝑤   𝑀,𝑎,𝑏,𝑐,𝑑,𝑝,𝑞,𝑟,𝑠,𝑡,𝑢,𝑣,𝑤   𝑆,𝑎,𝑏,𝑐,𝑑,𝑝,𝑞,𝑟,𝑠,𝑡,𝑢,𝑣,𝑤   𝜑,𝑎,𝑏,𝑐,𝑑,𝑝,𝑞,𝑟,𝑠,𝑡,𝑢,𝑣,𝑤

Proof of Theorem mulsunif2lem

Step	Hyp	Ref	Expression
1		mulsunif2.1	. . 3 ⊢ (𝜑 → 𝐿 <<s 𝑅)
2		mulsunif2.2	. . 3 ⊢ (𝜑 → 𝑀 <<s 𝑆)
3		mulsunif2.3	. . 3 ⊢ (𝜑 → 𝐴 = (𝐿 |s 𝑅))
4		mulsunif2.4	. . 3 ⊢ (𝜑 → 𝐵 = (𝑀 |s 𝑆))
5	1, 2, 3, 4	mulsunif 28372	. 2 ⊢ (𝜑 → (𝐴 ·s 𝐵) = (({𝑎 ∣ ∃𝑝 ∈ 𝐿 ∃𝑞 ∈ 𝑀 𝑎 = (((𝑝 ·s 𝐵) +s (𝐴 ·s 𝑞)) -s (𝑝 ·s 𝑞))} ∪ {𝑏 ∣ ∃𝑟 ∈ 𝑅 ∃𝑠 ∈ 𝑆 𝑏 = (((𝑟 ·s 𝐵) +s (𝐴 ·s 𝑠)) -s (𝑟 ·s 𝑠))}) |s ({𝑐 ∣ ∃𝑡 ∈ 𝐿 ∃𝑢 ∈ 𝑆 𝑐 = (((𝑡 ·s 𝐵) +s (𝐴 ·s 𝑢)) -s (𝑡 ·s 𝑢))} ∪ {𝑑 ∣ ∃𝑣 ∈ 𝑅 ∃𝑤 ∈ 𝑀 𝑑 = (((𝑣 ·s 𝐵) +s (𝐴 ·s 𝑤)) -s (𝑣 ·s 𝑤))})))
6	1	cutscld 28005	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝐿 |s 𝑅) ∈ No )
7	3, 6	eqeltrd 2865	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐴 ∈ No )
8	2	cutscld 28005	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑀 |s 𝑆) ∈ No )
9	4, 8	eqeltrd 2865	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐵 ∈ No )
10	7, 9	mulscld 28357	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 ·s 𝐵) ∈ No )
11	10	adantr 486	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → (𝐴 ·s 𝐵) ∈ No )
12		sltsss1 27987	. . . . . . . . . . . . . . 15 ⊢ (𝐿 <<s 𝑅 → 𝐿 ⊆ No )
13	1, 12	syl 18	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝐿 ⊆ No )
14	13	sselda 3938	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑝 ∈ 𝐿) → 𝑝 ∈ No )
15	14	adantrr 730	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → 𝑝 ∈ No )
16	9	adantr 486	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → 𝐵 ∈ No )
17	15, 16	mulscld 28357	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → (𝑝 ·s 𝐵) ∈ No )
18	7	adantr 486	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → 𝐴 ∈ No )
19		sltsss1 27987	. . . . . . . . . . . . . . . 16 ⊢ (𝑀 <<s 𝑆 → 𝑀 ⊆ No )
20	2, 19	syl 18	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑀 ⊆ No )
21	20	sselda 3938	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑞 ∈ 𝑀) → 𝑞 ∈ No )
22	21	adantrl 729	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → 𝑞 ∈ No )
23	18, 22	mulscld 28357	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → (𝐴 ·s 𝑞) ∈ No )
24	15, 22	mulscld 28357	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → (𝑝 ·s 𝑞) ∈ No )
25	23, 24	subscld 28285	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞)) ∈ No )
26	11, 17, 25	subsubs4d 28316	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → (((𝐴 ·s 𝐵) -s (𝑝 ·s 𝐵)) -s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞))) = ((𝐴 ·s 𝐵) -s ((𝑝 ·s 𝐵) +s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞)))))
27	26	oveq2d 7432	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → ((𝐴 ·s 𝐵) -s (((𝐴 ·s 𝐵) -s (𝑝 ·s 𝐵)) -s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞)))) = ((𝐴 ·s 𝐵) -s ((𝐴 ·s 𝐵) -s ((𝑝 ·s 𝐵) +s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞))))))
28	17, 25	addscld 28202	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → ((𝑝 ·s 𝐵) +s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞))) ∈ No )
29	11, 28	nncansd 28319	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → ((𝐴 ·s 𝐵) -s ((𝐴 ·s 𝐵) -s ((𝑝 ·s 𝐵) +s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞))))) = ((𝑝 ·s 𝐵) +s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞))))
30	27, 29	eqtrd 2800	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → ((𝐴 ·s 𝐵) -s (((𝐴 ·s 𝐵) -s (𝑝 ·s 𝐵)) -s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞)))) = ((𝑝 ·s 𝐵) +s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞))))
31	18, 15	subscld 28285	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → (𝐴 -s 𝑝) ∈ No )
32	31, 16, 22	subsdid 28380	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → ((𝐴 -s 𝑝) ·s (𝐵 -s 𝑞)) = (((𝐴 -s 𝑝) ·s 𝐵) -s ((𝐴 -s 𝑝) ·s 𝑞)))
33	18, 15, 16	subsdird 28381	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → ((𝐴 -s 𝑝) ·s 𝐵) = ((𝐴 ·s 𝐵) -s (𝑝 ·s 𝐵)))
34	18, 15, 22	subsdird 28381	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → ((𝐴 -s 𝑝) ·s 𝑞) = ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞)))
35	33, 34	oveq12d 7434	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → (((𝐴 -s 𝑝) ·s 𝐵) -s ((𝐴 -s 𝑝) ·s 𝑞)) = (((𝐴 ·s 𝐵) -s (𝑝 ·s 𝐵)) -s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞))))
36	32, 35	eqtrd 2800	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → ((𝐴 -s 𝑝) ·s (𝐵 -s 𝑞)) = (((𝐴 ·s 𝐵) -s (𝑝 ·s 𝐵)) -s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞))))
37	36	oveq2d 7432	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → ((𝐴 ·s 𝐵) -s ((𝐴 -s 𝑝) ·s (𝐵 -s 𝑞))) = ((𝐴 ·s 𝐵) -s (((𝐴 ·s 𝐵) -s (𝑝 ·s 𝐵)) -s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞)))))
38	17, 23, 24	addsubsassd 28303	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → (((𝑝 ·s 𝐵) +s (𝐴 ·s 𝑞)) -s (𝑝 ·s 𝑞)) = ((𝑝 ·s 𝐵) +s ((𝐴 ·s 𝑞) -s (𝑝 ·s 𝑞))))
39	30, 37, 38	3eqtr4rd 2811	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → (((𝑝 ·s 𝐵) +s (𝐴 ·s 𝑞)) -s (𝑝 ·s 𝑞)) = ((𝐴 ·s 𝐵) -s ((𝐴 -s 𝑝) ·s (𝐵 -s 𝑞))))
40	39	eqeq2d 2776	. . . . . 6 ⊢ ((𝜑 ∧ (𝑝 ∈ 𝐿 ∧ 𝑞 ∈ 𝑀)) → (𝑎 = (((𝑝 ·s 𝐵) +s (𝐴 ·s 𝑞)) -s (𝑝 ·s 𝑞)) ↔ 𝑎 = ((𝐴 ·s 𝐵) -s ((𝐴 -s 𝑝) ·s (𝐵 -s 𝑞)))))
41	40	2rexbidva 3230	. . . . 5 ⊢ (𝜑 → (∃𝑝 ∈ 𝐿 ∃𝑞 ∈ 𝑀 𝑎 = (((𝑝 ·s 𝐵) +s (𝐴 ·s 𝑞)) -s (𝑝 ·s 𝑞)) ↔ ∃𝑝 ∈ 𝐿 ∃𝑞 ∈ 𝑀 𝑎 = ((𝐴 ·s 𝐵) -s ((𝐴 -s 𝑝) ·s (𝐵 -s 𝑞)))))
42	41	abbidv 2831	. . . 4 ⊢ (𝜑 → {𝑎 ∣ ∃𝑝 ∈ 𝐿 ∃𝑞 ∈ 𝑀 𝑎 = (((𝑝 ·s 𝐵) +s (𝐴 ·s 𝑞)) -s (𝑝 ·s 𝑞))} = {𝑎 ∣ ∃𝑝 ∈ 𝐿 ∃𝑞 ∈ 𝑀 𝑎 = ((𝐴 ·s 𝐵) -s ((𝐴 -s 𝑝) ·s (𝐵 -s 𝑞)))})
43	10	adantr 486	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (𝐴 ·s 𝐵) ∈ No )
44		sltsss2 27988	. . . . . . . . . . . . . . 15 ⊢ (𝐿 <<s 𝑅 → 𝑅 ⊆ No )
45	1, 44	syl 18	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑅 ⊆ No )
46	45	sselda 3938	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑟 ∈ 𝑅) → 𝑟 ∈ No )
47	46	adantrr 730	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → 𝑟 ∈ No )
48		sltsss2 27988	. . . . . . . . . . . . . . 15 ⊢ (𝑀 <<s 𝑆 → 𝑆 ⊆ No )
49	2, 48	syl 18	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑆 ⊆ No )
50	49	sselda 3938	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑠 ∈ 𝑆) → 𝑠 ∈ No )
51	50	adantrl 729	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → 𝑠 ∈ No )
52	47, 51	mulscld 28357	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (𝑟 ·s 𝑠) ∈ No )
53	7	adantr 486	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → 𝐴 ∈ No )
54	53, 51	mulscld 28357	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (𝐴 ·s 𝑠) ∈ No )
55	52, 54	subscld 28285	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → ((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠)) ∈ No )
56	9	adantr 486	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → 𝐵 ∈ No )
57	47, 56	mulscld 28357	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (𝑟 ·s 𝐵) ∈ No )
58	57, 43	subscld 28285	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → ((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵)) ∈ No )
59	43, 55, 58	subsubs2d 28317	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → ((𝐴 ·s 𝐵) -s (((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠)) -s ((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵)))) = ((𝐴 ·s 𝐵) +s (((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵)) -s ((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠)))))
60	43, 58, 55	addsubsassd 28303	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (((𝐴 ·s 𝐵) +s ((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵))) -s ((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠))) = ((𝐴 ·s 𝐵) +s (((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵)) -s ((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠)))))
61		pncan3s 28295	. . . . . . . . . . 11 ⊢ (((𝐴 ·s 𝐵) ∈ No ∧ (𝑟 ·s 𝐵) ∈ No ) → ((𝐴 ·s 𝐵) +s ((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵))) = (𝑟 ·s 𝐵))
62	43, 57, 61	syl2anc 596	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → ((𝐴 ·s 𝐵) +s ((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵))) = (𝑟 ·s 𝐵))
63	62	oveq1d 7431	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (((𝐴 ·s 𝐵) +s ((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵))) -s ((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠))) = ((𝑟 ·s 𝐵) -s ((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠))))
64	59, 60, 63	3eqtr2d 2806	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → ((𝐴 ·s 𝐵) -s (((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠)) -s ((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵)))) = ((𝑟 ·s 𝐵) -s ((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠))))
65	47, 53	subscld 28285	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (𝑟 -s 𝐴) ∈ No )
66	65, 51, 56	subsdid 28380	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → ((𝑟 -s 𝐴) ·s (𝑠 -s 𝐵)) = (((𝑟 -s 𝐴) ·s 𝑠) -s ((𝑟 -s 𝐴) ·s 𝐵)))
67	47, 53, 51	subsdird 28381	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → ((𝑟 -s 𝐴) ·s 𝑠) = ((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠)))
68	47, 53, 56	subsdird 28381	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → ((𝑟 -s 𝐴) ·s 𝐵) = ((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵)))
69	67, 68	oveq12d 7434	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (((𝑟 -s 𝐴) ·s 𝑠) -s ((𝑟 -s 𝐴) ·s 𝐵)) = (((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠)) -s ((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵))))
70	66, 69	eqtrd 2800	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → ((𝑟 -s 𝐴) ·s (𝑠 -s 𝐵)) = (((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠)) -s ((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵))))
71	70	oveq2d 7432	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → ((𝐴 ·s 𝐵) -s ((𝑟 -s 𝐴) ·s (𝑠 -s 𝐵))) = ((𝐴 ·s 𝐵) -s (((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠)) -s ((𝑟 ·s 𝐵) -s (𝐴 ·s 𝐵)))))
72	57, 54, 52	addsubsassd 28303	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (((𝑟 ·s 𝐵) +s (𝐴 ·s 𝑠)) -s (𝑟 ·s 𝑠)) = ((𝑟 ·s 𝐵) +s ((𝐴 ·s 𝑠) -s (𝑟 ·s 𝑠))))
73	57, 52, 54	subsubs2d 28317	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → ((𝑟 ·s 𝐵) -s ((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠))) = ((𝑟 ·s 𝐵) +s ((𝐴 ·s 𝑠) -s (𝑟 ·s 𝑠))))
74	72, 73	eqtr4d 2803	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (((𝑟 ·s 𝐵) +s (𝐴 ·s 𝑠)) -s (𝑟 ·s 𝑠)) = ((𝑟 ·s 𝐵) -s ((𝑟 ·s 𝑠) -s (𝐴 ·s 𝑠))))
75	64, 71, 74	3eqtr4rd 2811	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (((𝑟 ·s 𝐵) +s (𝐴 ·s 𝑠)) -s (𝑟 ·s 𝑠)) = ((𝐴 ·s 𝐵) -s ((𝑟 -s 𝐴) ·s (𝑠 -s 𝐵))))
76	75	eqeq2d 2776	. . . . . 6 ⊢ ((𝜑 ∧ (𝑟 ∈ 𝑅 ∧ 𝑠 ∈ 𝑆)) → (𝑏 = (((𝑟 ·s 𝐵) +s (𝐴 ·s 𝑠)) -s (𝑟 ·s 𝑠)) ↔ 𝑏 = ((𝐴 ·s 𝐵) -s ((𝑟 -s 𝐴) ·s (𝑠 -s 𝐵)))))
77	76	2rexbidva 3230	. . . . 5 ⊢ (𝜑 → (∃𝑟 ∈ 𝑅 ∃𝑠 ∈ 𝑆 𝑏 = (((𝑟 ·s 𝐵) +s (𝐴 ·s 𝑠)) -s (𝑟 ·s 𝑠)) ↔ ∃𝑟 ∈ 𝑅 ∃𝑠 ∈ 𝑆 𝑏 = ((𝐴 ·s 𝐵) -s ((𝑟 -s 𝐴) ·s (𝑠 -s 𝐵)))))
78	77	abbidv 2831	. . . 4 ⊢ (𝜑 → {𝑏 ∣ ∃𝑟 ∈ 𝑅 ∃𝑠 ∈ 𝑆 𝑏 = (((𝑟 ·s 𝐵) +s (𝐴 ·s 𝑠)) -s (𝑟 ·s 𝑠))} = {𝑏 ∣ ∃𝑟 ∈ 𝑅 ∃𝑠 ∈ 𝑆 𝑏 = ((𝐴 ·s 𝐵) -s ((𝑟 -s 𝐴) ·s (𝑠 -s 𝐵)))})
79	42, 78	uneq12d 4123	. . 3 ⊢ (𝜑 → ({𝑎 ∣ ∃𝑝 ∈ 𝐿 ∃𝑞 ∈ 𝑀 𝑎 = (((𝑝 ·s 𝐵) +s (𝐴 ·s 𝑞)) -s (𝑝 ·s 𝑞))} ∪ {𝑏 ∣ ∃𝑟 ∈ 𝑅 ∃𝑠 ∈ 𝑆 𝑏 = (((𝑟 ·s 𝐵) +s (𝐴 ·s 𝑠)) -s (𝑟 ·s 𝑠))}) = ({𝑎 ∣ ∃𝑝 ∈ 𝐿 ∃𝑞 ∈ 𝑀 𝑎 = ((𝐴 ·s 𝐵) -s ((𝐴 -s 𝑝) ·s (𝐵 -s 𝑞)))} ∪ {𝑏 ∣ ∃𝑟 ∈ 𝑅 ∃𝑠 ∈ 𝑆 𝑏 = ((𝐴 ·s 𝐵) -s ((𝑟 -s 𝐴) ·s (𝑠 -s 𝐵)))}))
80	7	adantr 486	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → 𝐴 ∈ No )
81	49	sselda 3938	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑢 ∈ 𝑆) → 𝑢 ∈ No )
82	81	adantrl 729	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → 𝑢 ∈ No )
83	80, 82	mulscld 28357	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (𝐴 ·s 𝑢) ∈ No )
84	10	adantr 486	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (𝐴 ·s 𝐵) ∈ No )
85	83, 84	subscld 28285	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → ((𝐴 ·s 𝑢) -s (𝐴 ·s 𝐵)) ∈ No )
86	13	sselda 3938	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑡 ∈ 𝐿) → 𝑡 ∈ No )
87	86	adantrr 730	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → 𝑡 ∈ No )
88	87, 82	mulscld 28357	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (𝑡 ·s 𝑢) ∈ No )
89	9	adantr 486	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → 𝐵 ∈ No )
90	87, 89	mulscld 28357	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (𝑡 ·s 𝐵) ∈ No )
91	85, 88, 90	subsubs2d 28317	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (((𝐴 ·s 𝑢) -s (𝐴 ·s 𝐵)) -s ((𝑡 ·s 𝑢) -s (𝑡 ·s 𝐵))) = (((𝐴 ·s 𝑢) -s (𝐴 ·s 𝐵)) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))))
92	90, 88	subscld 28285	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢)) ∈ No )
93	83, 92, 84	addsubsd 28304	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))) -s (𝐴 ·s 𝐵)) = (((𝐴 ·s 𝑢) -s (𝐴 ·s 𝐵)) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))))
94	91, 93	eqtr4d 2803	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (((𝐴 ·s 𝑢) -s (𝐴 ·s 𝐵)) -s ((𝑡 ·s 𝑢) -s (𝑡 ·s 𝐵))) = (((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))) -s (𝐴 ·s 𝐵)))
95	94	oveq2d 7432	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → ((𝐴 ·s 𝐵) +s (((𝐴 ·s 𝑢) -s (𝐴 ·s 𝐵)) -s ((𝑡 ·s 𝑢) -s (𝑡 ·s 𝐵)))) = ((𝐴 ·s 𝐵) +s (((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))) -s (𝐴 ·s 𝐵))))
96	83, 92	addscld 28202	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → ((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))) ∈ No )
97		pncan3s 28295	. . . . . . . . . 10 ⊢ (((𝐴 ·s 𝐵) ∈ No ∧ ((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))) ∈ No ) → ((𝐴 ·s 𝐵) +s (((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))) -s (𝐴 ·s 𝐵))) = ((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))))
98	84, 96, 97	syl2anc 596	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → ((𝐴 ·s 𝐵) +s (((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))) -s (𝐴 ·s 𝐵))) = ((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))))
99	95, 98	eqtrd 2800	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → ((𝐴 ·s 𝐵) +s (((𝐴 ·s 𝑢) -s (𝐴 ·s 𝐵)) -s ((𝑡 ·s 𝑢) -s (𝑡 ·s 𝐵)))) = ((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))))
100	82, 89	subscld 28285	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (𝑢 -s 𝐵) ∈ No )
101	80, 87, 100	subsdird 28381	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → ((𝐴 -s 𝑡) ·s (𝑢 -s 𝐵)) = ((𝐴 ·s (𝑢 -s 𝐵)) -s (𝑡 ·s (𝑢 -s 𝐵))))
102	80, 82, 89	subsdid 28380	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (𝐴 ·s (𝑢 -s 𝐵)) = ((𝐴 ·s 𝑢) -s (𝐴 ·s 𝐵)))
103	87, 82, 89	subsdid 28380	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (𝑡 ·s (𝑢 -s 𝐵)) = ((𝑡 ·s 𝑢) -s (𝑡 ·s 𝐵)))
104	102, 103	oveq12d 7434	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → ((𝐴 ·s (𝑢 -s 𝐵)) -s (𝑡 ·s (𝑢 -s 𝐵))) = (((𝐴 ·s 𝑢) -s (𝐴 ·s 𝐵)) -s ((𝑡 ·s 𝑢) -s (𝑡 ·s 𝐵))))
105	101, 104	eqtrd 2800	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → ((𝐴 -s 𝑡) ·s (𝑢 -s 𝐵)) = (((𝐴 ·s 𝑢) -s (𝐴 ·s 𝐵)) -s ((𝑡 ·s 𝑢) -s (𝑡 ·s 𝐵))))
106	105	oveq2d 7432	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → ((𝐴 ·s 𝐵) +s ((𝐴 -s 𝑡) ·s (𝑢 -s 𝐵))) = ((𝐴 ·s 𝐵) +s (((𝐴 ·s 𝑢) -s (𝐴 ·s 𝐵)) -s ((𝑡 ·s 𝑢) -s (𝑡 ·s 𝐵)))))
107	90, 83	addscomd 28189	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → ((𝑡 ·s 𝐵) +s (𝐴 ·s 𝑢)) = ((𝐴 ·s 𝑢) +s (𝑡 ·s 𝐵)))
108	107	oveq1d 7431	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (((𝑡 ·s 𝐵) +s (𝐴 ·s 𝑢)) -s (𝑡 ·s 𝑢)) = (((𝐴 ·s 𝑢) +s (𝑡 ·s 𝐵)) -s (𝑡 ·s 𝑢)))
109	83, 90, 88	addsubsassd 28303	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (((𝐴 ·s 𝑢) +s (𝑡 ·s 𝐵)) -s (𝑡 ·s 𝑢)) = ((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))))
110	108, 109	eqtrd 2800	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (((𝑡 ·s 𝐵) +s (𝐴 ·s 𝑢)) -s (𝑡 ·s 𝑢)) = ((𝐴 ·s 𝑢) +s ((𝑡 ·s 𝐵) -s (𝑡 ·s 𝑢))))
111	99, 106, 110	3eqtr4rd 2811	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (((𝑡 ·s 𝐵) +s (𝐴 ·s 𝑢)) -s (𝑡 ·s 𝑢)) = ((𝐴 ·s 𝐵) +s ((𝐴 -s 𝑡) ·s (𝑢 -s 𝐵))))
112	111	eqeq2d 2776	. . . . . 6 ⊢ ((𝜑 ∧ (𝑡 ∈ 𝐿 ∧ 𝑢 ∈ 𝑆)) → (𝑐 = (((𝑡 ·s 𝐵) +s (𝐴 ·s 𝑢)) -s (𝑡 ·s 𝑢)) ↔ 𝑐 = ((𝐴 ·s 𝐵) +s ((𝐴 -s 𝑡) ·s (𝑢 -s 𝐵)))))
113	112	2rexbidva 3230	. . . . 5 ⊢ (𝜑 → (∃𝑡 ∈ 𝐿 ∃𝑢 ∈ 𝑆 𝑐 = (((𝑡 ·s 𝐵) +s (𝐴 ·s 𝑢)) -s (𝑡 ·s 𝑢)) ↔ ∃𝑡 ∈ 𝐿 ∃𝑢 ∈ 𝑆 𝑐 = ((𝐴 ·s 𝐵) +s ((𝐴 -s 𝑡) ·s (𝑢 -s 𝐵)))))
114	113	abbidv 2831	. . . 4 ⊢ (𝜑 → {𝑐 ∣ ∃𝑡 ∈ 𝐿 ∃𝑢 ∈ 𝑆 𝑐 = (((𝑡 ·s 𝐵) +s (𝐴 ·s 𝑢)) -s (𝑡 ·s 𝑢))} = {𝑐 ∣ ∃𝑡 ∈ 𝐿 ∃𝑢 ∈ 𝑆 𝑐 = ((𝐴 ·s 𝐵) +s ((𝐴 -s 𝑡) ·s (𝑢 -s 𝐵)))})
115	45	sselda 3938	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑣 ∈ 𝑅) → 𝑣 ∈ No )
116	115	adantrr 730	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → 𝑣 ∈ No )
117	9	adantr 486	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → 𝐵 ∈ No )
118	116, 117	mulscld 28357	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (𝑣 ·s 𝐵) ∈ No )
119	20	sselda 3938	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑤 ∈ 𝑀) → 𝑤 ∈ No )
120	119	adantrl 729	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → 𝑤 ∈ No )
121	116, 120	mulscld 28357	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (𝑣 ·s 𝑤) ∈ No )
122	118, 121	subscld 28285	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → ((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) ∈ No )
123	10	adantr 486	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (𝐴 ·s 𝐵) ∈ No )
124	7	adantr 486	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → 𝐴 ∈ No )
125	124, 120	mulscld 28357	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (𝐴 ·s 𝑤) ∈ No )
126	122, 123, 125	subsubs2d 28317	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) -s ((𝐴 ·s 𝐵) -s (𝐴 ·s 𝑤))) = (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s ((𝐴 ·s 𝑤) -s (𝐴 ·s 𝐵))))
127	122, 125, 123	addsubsassd 28303	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → ((((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s (𝐴 ·s 𝑤)) -s (𝐴 ·s 𝐵)) = (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s ((𝐴 ·s 𝑤) -s (𝐴 ·s 𝐵))))
128	126, 127	eqtr4d 2803	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) -s ((𝐴 ·s 𝐵) -s (𝐴 ·s 𝑤))) = ((((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s (𝐴 ·s 𝑤)) -s (𝐴 ·s 𝐵)))
129	128	oveq2d 7432	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → ((𝐴 ·s 𝐵) +s (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) -s ((𝐴 ·s 𝐵) -s (𝐴 ·s 𝑤)))) = ((𝐴 ·s 𝐵) +s ((((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s (𝐴 ·s 𝑤)) -s (𝐴 ·s 𝐵))))
130	122, 125	addscld 28202	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s (𝐴 ·s 𝑤)) ∈ No )
131		pncan3s 28295	. . . . . . . . . 10 ⊢ (((𝐴 ·s 𝐵) ∈ No ∧ (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s (𝐴 ·s 𝑤)) ∈ No ) → ((𝐴 ·s 𝐵) +s ((((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s (𝐴 ·s 𝑤)) -s (𝐴 ·s 𝐵))) = (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s (𝐴 ·s 𝑤)))
132	123, 130, 131	syl2anc 596	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → ((𝐴 ·s 𝐵) +s ((((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s (𝐴 ·s 𝑤)) -s (𝐴 ·s 𝐵))) = (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s (𝐴 ·s 𝑤)))
133	129, 132	eqtrd 2800	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → ((𝐴 ·s 𝐵) +s (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) -s ((𝐴 ·s 𝐵) -s (𝐴 ·s 𝑤)))) = (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s (𝐴 ·s 𝑤)))
134	117, 120	subscld 28285	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (𝐵 -s 𝑤) ∈ No )
135	116, 124, 134	subsdird 28381	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → ((𝑣 -s 𝐴) ·s (𝐵 -s 𝑤)) = ((𝑣 ·s (𝐵 -s 𝑤)) -s (𝐴 ·s (𝐵 -s 𝑤))))
136	116, 117, 120	subsdid 28380	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (𝑣 ·s (𝐵 -s 𝑤)) = ((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)))
137	124, 117, 120	subsdid 28380	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (𝐴 ·s (𝐵 -s 𝑤)) = ((𝐴 ·s 𝐵) -s (𝐴 ·s 𝑤)))
138	136, 137	oveq12d 7434	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → ((𝑣 ·s (𝐵 -s 𝑤)) -s (𝐴 ·s (𝐵 -s 𝑤))) = (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) -s ((𝐴 ·s 𝐵) -s (𝐴 ·s 𝑤))))
139	135, 138	eqtrd 2800	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → ((𝑣 -s 𝐴) ·s (𝐵 -s 𝑤)) = (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) -s ((𝐴 ·s 𝐵) -s (𝐴 ·s 𝑤))))
140	139	oveq2d 7432	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → ((𝐴 ·s 𝐵) +s ((𝑣 -s 𝐴) ·s (𝐵 -s 𝑤))) = ((𝐴 ·s 𝐵) +s (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) -s ((𝐴 ·s 𝐵) -s (𝐴 ·s 𝑤)))))
141	118, 125, 121	addsubsd 28304	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (((𝑣 ·s 𝐵) +s (𝐴 ·s 𝑤)) -s (𝑣 ·s 𝑤)) = (((𝑣 ·s 𝐵) -s (𝑣 ·s 𝑤)) +s (𝐴 ·s 𝑤)))
142	133, 140, 141	3eqtr4rd 2811	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (((𝑣 ·s 𝐵) +s (𝐴 ·s 𝑤)) -s (𝑣 ·s 𝑤)) = ((𝐴 ·s 𝐵) +s ((𝑣 -s 𝐴) ·s (𝐵 -s 𝑤))))
143	142	eqeq2d 2776	. . . . . 6 ⊢ ((𝜑 ∧ (𝑣 ∈ 𝑅 ∧ 𝑤 ∈ 𝑀)) → (𝑑 = (((𝑣 ·s 𝐵) +s (𝐴 ·s 𝑤)) -s (𝑣 ·s 𝑤)) ↔ 𝑑 = ((𝐴 ·s 𝐵) +s ((𝑣 -s 𝐴) ·s (𝐵 -s 𝑤)))))
144	143	2rexbidva 3230	. . . . 5 ⊢ (𝜑 → (∃𝑣 ∈ 𝑅 ∃𝑤 ∈ 𝑀 𝑑 = (((𝑣 ·s 𝐵) +s (𝐴 ·s 𝑤)) -s (𝑣 ·s 𝑤)) ↔ ∃𝑣 ∈ 𝑅 ∃𝑤 ∈ 𝑀 𝑑 = ((𝐴 ·s 𝐵) +s ((𝑣 -s 𝐴) ·s (𝐵 -s 𝑤)))))
145	144	abbidv 2831	. . . 4 ⊢ (𝜑 → {𝑑 ∣ ∃𝑣 ∈ 𝑅 ∃𝑤 ∈ 𝑀 𝑑 = (((𝑣 ·s 𝐵) +s (𝐴 ·s 𝑤)) -s (𝑣 ·s 𝑤))} = {𝑑 ∣ ∃𝑣 ∈ 𝑅 ∃𝑤 ∈ 𝑀 𝑑 = ((𝐴 ·s 𝐵) +s ((𝑣 -s 𝐴) ·s (𝐵 -s 𝑤)))})
146	114, 145	uneq12d 4123	. . 3 ⊢ (𝜑 → ({𝑐 ∣ ∃𝑡 ∈ 𝐿 ∃𝑢 ∈ 𝑆 𝑐 = (((𝑡 ·s 𝐵) +s (𝐴 ·s 𝑢)) -s (𝑡 ·s 𝑢))} ∪ {𝑑 ∣ ∃𝑣 ∈ 𝑅 ∃𝑤 ∈ 𝑀 𝑑 = (((𝑣 ·s 𝐵) +s (𝐴 ·s 𝑤)) -s (𝑣 ·s 𝑤))}) = ({𝑐 ∣ ∃𝑡 ∈ 𝐿 ∃𝑢 ∈ 𝑆 𝑐 = ((𝐴 ·s 𝐵) +s ((𝐴 -s 𝑡) ·s (𝑢 -s 𝐵)))} ∪ {𝑑 ∣ ∃𝑣 ∈ 𝑅 ∃𝑤 ∈ 𝑀 𝑑 = ((𝐴 ·s 𝐵) +s ((𝑣 -s 𝐴) ·s (𝐵 -s 𝑤)))}))
147	79, 146	oveq12d 7434	. 2 ⊢ (𝜑 → (({𝑎 ∣ ∃𝑝 ∈ 𝐿 ∃𝑞 ∈ 𝑀 𝑎 = (((𝑝 ·s 𝐵) +s (𝐴 ·s 𝑞)) -s (𝑝 ·s 𝑞))} ∪ {𝑏 ∣ ∃𝑟 ∈ 𝑅 ∃𝑠 ∈ 𝑆 𝑏 = (((𝑟 ·s 𝐵) +s (𝐴 ·s 𝑠)) -s (𝑟 ·s 𝑠))}) |s ({𝑐 ∣ ∃𝑡 ∈ 𝐿 ∃𝑢 ∈ 𝑆 𝑐 = (((𝑡 ·s 𝐵) +s (𝐴 ·s 𝑢)) -s (𝑡 ·s 𝑢))} ∪ {𝑑 ∣ ∃𝑣 ∈ 𝑅 ∃𝑤 ∈ 𝑀 𝑑 = (((𝑣 ·s 𝐵) +s (𝐴 ·s 𝑤)) -s (𝑣 ·s 𝑤))})) = (({𝑎 ∣ ∃𝑝 ∈ 𝐿 ∃𝑞 ∈ 𝑀 𝑎 = ((𝐴 ·s 𝐵) -s ((𝐴 -s 𝑝) ·s (𝐵 -s 𝑞)))} ∪ {𝑏 ∣ ∃𝑟 ∈ 𝑅 ∃𝑠 ∈ 𝑆 𝑏 = ((𝐴 ·s 𝐵) -s ((𝑟 -s 𝐴) ·s (𝑠 -s 𝐵)))}) |s ({𝑐 ∣ ∃𝑡 ∈ 𝐿 ∃𝑢 ∈ 𝑆 𝑐 = ((𝐴 ·s 𝐵) +s ((𝐴 -s 𝑡) ·s (𝑢 -s 𝐵)))} ∪ {𝑑 ∣ ∃𝑣 ∈ 𝑅 ∃𝑤 ∈ 𝑀 𝑑 = ((𝐴 ·s 𝐵) +s ((𝑣 -s 𝐴) ·s (𝐵 -s 𝑤)))})))
148	5, 147	eqtrd 2800	1 ⊢ (𝜑 → (𝐴 ·s 𝐵) = (({𝑎 ∣ ∃𝑝 ∈ 𝐿 ∃𝑞 ∈ 𝑀 𝑎 = ((𝐴 ·s 𝐵) -s ((𝐴 -s 𝑝) ·s (𝐵 -s 𝑞)))} ∪ {𝑏 ∣ ∃𝑟 ∈ 𝑅 ∃𝑠 ∈ 𝑆 𝑏 = ((𝐴 ·s 𝐵) -s ((𝑟 -s 𝐴) ·s (𝑠 -s 𝐵)))}) |s ({𝑐 ∣ ∃𝑡 ∈ 𝐿 ∃𝑢 ∈ 𝑆 𝑐 = ((𝐴 ·s 𝐵) +s ((𝐴 -s 𝑡) ·s (𝑢 -s 𝐵)))} ∪ {𝑑 ∣ ∃𝑣 ∈ 𝑅 ∃𝑤 ∈ 𝑀 𝑑 = ((𝐴 ·s 𝐵) +s ((𝑣 -s 𝐴) ·s (𝐵 -s 𝑤)))})))

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1570   ∈ wcel 2146  {cab 2743  ∃wrex 3091   ∪ cun 3904   ⊆ wss 3906   class class class wbr 5111  (class class class)co 7416   No csur 27833   <<s cslts 27979   |s ccuts 27981   +_s cadds 28181   -_s csubs 28242   ·_s cmuls 28328

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 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737  ax-rep 5240  ax-sep 5259  ax-nul 5271  ax-pow 5338  ax-pr 5406  ax-un 7738

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 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-ral 3082  df-rex 3092  df-rmo 3371  df-reu 3372  df-rab 3419  df-v 3459  df-sbc 3747  df-csb 3855  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-pss 3926  df-nul 4287  df-if 4490  df-pw 4566  df-sn 4592  df-pr 4594  df-tp 4596  df-op 4598  df-ot 4600  df-uni 4875  df-int 4915  df-iun 4960  df-br 5112  df-opab 5176  df-mpt 5195  df-tr 5221  df-id 5558  df-eprel 5563  df-po 5571  df-so 5572  df-fr 5616  df-se 5617  df-we 5618  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-res 5675  df-ima 5676  df-pred 6306  df-ord 6367  df-on 6368  df-suc 6370  df-iota 6496  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-fo 6546  df-f1o 6547  df-fv 6548  df-riota 7373  df-ov 7419  df-oprab 7420  df-mpo 7421  df-1st 7988  df-2nd 7989  df-frecs 8280  df-wrecs 8311  df-recs 8360  df-1o 8455  df-2o 8456  df-nadd 8654  df-no 27836  df-lts 27837  df-bday 27838  df-les 27938  df-slts 27980  df-cuts 27982  df-0s 28029  df-made 28049  df-old 28050  df-left 28052  df-right 28053  df-norec 28160  df-norec2 28171  df-adds 28182  df-negs 28243  df-subs 28244  df-muls 28329

This theorem is used by:  mulsunif2  28392