Theorem addsass 28397

Description: Surreal addition is associative. Part of theorem 3 of [Conway] p. 17. (Contributed by Scott Fenton, 22-Jan-2025.)

Assertion

Ref	Expression
addsass	⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ 𝐶 ∈ No) → ((𝐴 +s 𝐵) +s 𝐶) = (𝐴 +s (𝐵 +s 𝐶)))

Proof of Theorem addsass

Dummy variables 𝑥 𝑦 𝑧 𝑎 𝑏 𝑐 𝑑 𝑒 𝑓 𝑥_𝑂 𝑦_𝑂 𝑧_𝑂 𝑥_𝐿 𝑦_𝐿 𝑧_𝐿 𝑥_𝑅 𝑦_𝑅 𝑧_𝑅 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		oveq1 7428	. . . 4 ⊢ (𝑥 = 𝑥𝑂 → (𝑥 +s 𝑦) = (𝑥𝑂 +s 𝑦))
2	1	oveq1d 7436	. . 3 ⊢ (𝑥 = 𝑥𝑂 → ((𝑥 +s 𝑦) +s 𝑧) = ((𝑥𝑂 +s 𝑦) +s 𝑧))
3		oveq1 7428	. . 3 ⊢ (𝑥 = 𝑥𝑂 → (𝑥 +s (𝑦 +s 𝑧)) = (𝑥𝑂 +s (𝑦 +s 𝑧)))
4	2, 3	eqeq12d 2776	. 2 ⊢ (𝑥 = 𝑥𝑂 → (((𝑥 +s 𝑦) +s 𝑧) = (𝑥 +s (𝑦 +s 𝑧)) ↔ ((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧))))
5		oveq2 7429	. . . 4 ⊢ (𝑦 = 𝑦𝑂 → (𝑥𝑂 +s 𝑦) = (𝑥𝑂 +s 𝑦𝑂))
6	5	oveq1d 7436	. . 3 ⊢ (𝑦 = 𝑦𝑂 → ((𝑥𝑂 +s 𝑦) +s 𝑧) = ((𝑥𝑂 +s 𝑦𝑂) +s 𝑧))
7		oveq1 7428	. . . 4 ⊢ (𝑦 = 𝑦𝑂 → (𝑦 +s 𝑧) = (𝑦𝑂 +s 𝑧))
8	7	oveq2d 7437	. . 3 ⊢ (𝑦 = 𝑦𝑂 → (𝑥𝑂 +s (𝑦 +s 𝑧)) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧)))
9	6, 8	eqeq12d 2776	. 2 ⊢ (𝑦 = 𝑦𝑂 → (((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ↔ ((𝑥𝑂 +s 𝑦𝑂) +s 𝑧) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧))))
10		oveq2 7429	. . 3 ⊢ (𝑧 = 𝑧𝑂 → ((𝑥𝑂 +s 𝑦𝑂) +s 𝑧) = ((𝑥𝑂 +s 𝑦𝑂) +s 𝑧𝑂))
11		oveq2 7429	. . . 4 ⊢ (𝑧 = 𝑧𝑂 → (𝑦𝑂 +s 𝑧) = (𝑦𝑂 +s 𝑧𝑂))
12	11	oveq2d 7437	. . 3 ⊢ (𝑧 = 𝑧𝑂 → (𝑥𝑂 +s (𝑦𝑂 +s 𝑧)) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧𝑂)))
13	10, 12	eqeq12d 2776	. 2 ⊢ (𝑧 = 𝑧𝑂 → (((𝑥𝑂 +s 𝑦𝑂) +s 𝑧) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧)) ↔ ((𝑥𝑂 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧𝑂))))
14		oveq1 7428	. . . 4 ⊢ (𝑥 = 𝑥𝑂 → (𝑥 +s 𝑦𝑂) = (𝑥𝑂 +s 𝑦𝑂))
15	14	oveq1d 7436	. . 3 ⊢ (𝑥 = 𝑥𝑂 → ((𝑥 +s 𝑦𝑂) +s 𝑧𝑂) = ((𝑥𝑂 +s 𝑦𝑂) +s 𝑧𝑂))
16		oveq1 7428	. . 3 ⊢ (𝑥 = 𝑥𝑂 → (𝑥 +s (𝑦𝑂 +s 𝑧𝑂)) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧𝑂)))
17	15, 16	eqeq12d 2776	. 2 ⊢ (𝑥 = 𝑥𝑂 → (((𝑥 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥 +s (𝑦𝑂 +s 𝑧𝑂)) ↔ ((𝑥𝑂 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧𝑂))))
18		oveq2 7429	. . . 4 ⊢ (𝑦 = 𝑦𝑂 → (𝑥 +s 𝑦) = (𝑥 +s 𝑦𝑂))
19	18	oveq1d 7436	. . 3 ⊢ (𝑦 = 𝑦𝑂 → ((𝑥 +s 𝑦) +s 𝑧𝑂) = ((𝑥 +s 𝑦𝑂) +s 𝑧𝑂))
20		oveq1 7428	. . . 4 ⊢ (𝑦 = 𝑦𝑂 → (𝑦 +s 𝑧𝑂) = (𝑦𝑂 +s 𝑧𝑂))
21	20	oveq2d 7437	. . 3 ⊢ (𝑦 = 𝑦𝑂 → (𝑥 +s (𝑦 +s 𝑧𝑂)) = (𝑥 +s (𝑦𝑂 +s 𝑧𝑂)))
22	19, 21	eqeq12d 2776	. 2 ⊢ (𝑦 = 𝑦𝑂 → (((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)) ↔ ((𝑥 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥 +s (𝑦𝑂 +s 𝑧𝑂))))
23	5	oveq1d 7436	. . 3 ⊢ (𝑦 = 𝑦𝑂 → ((𝑥𝑂 +s 𝑦) +s 𝑧𝑂) = ((𝑥𝑂 +s 𝑦𝑂) +s 𝑧𝑂))
24	20	oveq2d 7437	. . 3 ⊢ (𝑦 = 𝑦𝑂 → (𝑥𝑂 +s (𝑦 +s 𝑧𝑂)) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧𝑂)))
25	23, 24	eqeq12d 2776	. 2 ⊢ (𝑦 = 𝑦𝑂 → (((𝑥𝑂 +s 𝑦) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦 +s 𝑧𝑂)) ↔ ((𝑥𝑂 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧𝑂))))
26		oveq2 7429	. . 3 ⊢ (𝑧 = 𝑧𝑂 → ((𝑥 +s 𝑦𝑂) +s 𝑧) = ((𝑥 +s 𝑦𝑂) +s 𝑧𝑂))
27	11	oveq2d 7437	. . 3 ⊢ (𝑧 = 𝑧𝑂 → (𝑥 +s (𝑦𝑂 +s 𝑧)) = (𝑥 +s (𝑦𝑂 +s 𝑧𝑂)))
28	26, 27	eqeq12d 2776	. 2 ⊢ (𝑧 = 𝑧𝑂 → (((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ↔ ((𝑥 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥 +s (𝑦𝑂 +s 𝑧𝑂))))
29		oveq1 7428	. . . 4 ⊢ (𝑥 = 𝐴 → (𝑥 +s 𝑦) = (𝐴 +s 𝑦))
30	29	oveq1d 7436	. . 3 ⊢ (𝑥 = 𝐴 → ((𝑥 +s 𝑦) +s 𝑧) = ((𝐴 +s 𝑦) +s 𝑧))
31		oveq1 7428	. . 3 ⊢ (𝑥 = 𝐴 → (𝑥 +s (𝑦 +s 𝑧)) = (𝐴 +s (𝑦 +s 𝑧)))
32	30, 31	eqeq12d 2776	. 2 ⊢ (𝑥 = 𝐴 → (((𝑥 +s 𝑦) +s 𝑧) = (𝑥 +s (𝑦 +s 𝑧)) ↔ ((𝐴 +s 𝑦) +s 𝑧) = (𝐴 +s (𝑦 +s 𝑧))))
33		oveq2 7429	. . . 4 ⊢ (𝑦 = 𝐵 → (𝐴 +s 𝑦) = (𝐴 +s 𝐵))
34	33	oveq1d 7436	. . 3 ⊢ (𝑦 = 𝐵 → ((𝐴 +s 𝑦) +s 𝑧) = ((𝐴 +s 𝐵) +s 𝑧))
35		oveq1 7428	. . . 4 ⊢ (𝑦 = 𝐵 → (𝑦 +s 𝑧) = (𝐵 +s 𝑧))
36	35	oveq2d 7437	. . 3 ⊢ (𝑦 = 𝐵 → (𝐴 +s (𝑦 +s 𝑧)) = (𝐴 +s (𝐵 +s 𝑧)))
37	34, 36	eqeq12d 2776	. 2 ⊢ (𝑦 = 𝐵 → (((𝐴 +s 𝑦) +s 𝑧) = (𝐴 +s (𝑦 +s 𝑧)) ↔ ((𝐴 +s 𝐵) +s 𝑧) = (𝐴 +s (𝐵 +s 𝑧))))
38		oveq2 7429	. . 3 ⊢ (𝑧 = 𝐶 → ((𝐴 +s 𝐵) +s 𝑧) = ((𝐴 +s 𝐵) +s 𝐶))
39		oveq2 7429	. . . 4 ⊢ (𝑧 = 𝐶 → (𝐵 +s 𝑧) = (𝐵 +s 𝐶))
40	39	oveq2d 7437	. . 3 ⊢ (𝑧 = 𝐶 → (𝐴 +s (𝐵 +s 𝑧)) = (𝐴 +s (𝐵 +s 𝐶)))
41	38, 40	eqeq12d 2776	. 2 ⊢ (𝑧 = 𝐶 → (((𝐴 +s 𝐵) +s 𝑧) = (𝐴 +s (𝐵 +s 𝑧)) ↔ ((𝐴 +s 𝐵) +s 𝐶) = (𝐴 +s (𝐵 +s 𝐶))))
42		simp21 1225	. . . 4 ⊢ (((∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥𝑂 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧𝑂)) ∧ ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥𝑂 +s 𝑦𝑂) +s 𝑧) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥𝑂 +s 𝑦) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦 +s 𝑧𝑂))) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥 +s (𝑦𝑂 +s 𝑧𝑂)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧))) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂))) → ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)))
43		simp23 1227	. . . 4 ⊢ (((∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥𝑂 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧𝑂)) ∧ ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥𝑂 +s 𝑦𝑂) +s 𝑧) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥𝑂 +s 𝑦) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦 +s 𝑧𝑂))) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥 +s (𝑦𝑂 +s 𝑧𝑂)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧))) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂))) → ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)))
44		simp3 1156	. . . 4 ⊢ (((∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥𝑂 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧𝑂)) ∧ ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥𝑂 +s 𝑦𝑂) +s 𝑧) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥𝑂 +s 𝑦) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦 +s 𝑧𝑂))) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥 +s (𝑦𝑂 +s 𝑧𝑂)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧))) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂))) → ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))
45	42, 43, 44	3jca 1146	. . 3 ⊢ (((∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥𝑂 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧𝑂)) ∧ ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥𝑂 +s 𝑦𝑂) +s 𝑧) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥𝑂 +s 𝑦) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦 +s 𝑧𝑂))) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥 +s (𝑦𝑂 +s 𝑧𝑂)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧))) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂))) → (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂))))
46		oveq1 7428	. . . . . . . . . . . . . 14 ⊢ (𝑥𝑂 = 𝑥𝐿 → (𝑥𝑂 +s 𝑦) = (𝑥𝐿 +s 𝑦))
47	46	oveq1d 7436	. . . . . . . . . . . . 13 ⊢ (𝑥𝑂 = 𝑥𝐿 → ((𝑥𝑂 +s 𝑦) +s 𝑧) = ((𝑥𝐿 +s 𝑦) +s 𝑧))
48		oveq1 7428	. . . . . . . . . . . . 13 ⊢ (𝑥𝑂 = 𝑥𝐿 → (𝑥𝑂 +s (𝑦 +s 𝑧)) = (𝑥𝐿 +s (𝑦 +s 𝑧)))
49	47, 48	eqeq12d 2776	. . . . . . . . . . . 12 ⊢ (𝑥𝑂 = 𝑥𝐿 → (((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ↔ ((𝑥𝐿 +s 𝑦) +s 𝑧) = (𝑥𝐿 +s (𝑦 +s 𝑧))))
50		simplr1 1234	. . . . . . . . . . . 12 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑥𝐿 ∈ (L‘𝑥)) → ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)))
51		elun1 4180	. . . . . . . . . . . . 13 ⊢ (𝑥𝐿 ∈ (L‘𝑥) → 𝑥𝐿 ∈ ((L‘𝑥) ∪ (R‘𝑥)))
52	51	adantl 487	. . . . . . . . . . . 12 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑥𝐿 ∈ (L‘𝑥)) → 𝑥𝐿 ∈ ((L‘𝑥) ∪ (R‘𝑥)))
53	49, 50, 52	rspcdva 3577	. . . . . . . . . . 11 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑥𝐿 ∈ (L‘𝑥)) → ((𝑥𝐿 +s 𝑦) +s 𝑧) = (𝑥𝐿 +s (𝑦 +s 𝑧)))
54	53	eqeq2d 2771	. . . . . . . . . 10 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑥𝐿 ∈ (L‘𝑥)) → (𝑎 = ((𝑥𝐿 +s 𝑦) +s 𝑧) ↔ 𝑎 = (𝑥𝐿 +s (𝑦 +s 𝑧))))
55	54	rexbidva 3184	. . . . . . . . 9 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → (∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = ((𝑥𝐿 +s 𝑦) +s 𝑧) ↔ ∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = (𝑥𝐿 +s (𝑦 +s 𝑧))))
56	55	abbidv 2826	. . . . . . . 8 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → {𝑎 ∣ ∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = ((𝑥𝐿 +s 𝑦) +s 𝑧)} = {𝑎 ∣ ∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = (𝑥𝐿 +s (𝑦 +s 𝑧))})
57		oveq2 7429	. . . . . . . . . . . . . 14 ⊢ (𝑦𝑂 = 𝑦𝐿 → (𝑥 +s 𝑦𝑂) = (𝑥 +s 𝑦𝐿))
58	57	oveq1d 7436	. . . . . . . . . . . . 13 ⊢ (𝑦𝑂 = 𝑦𝐿 → ((𝑥 +s 𝑦𝑂) +s 𝑧) = ((𝑥 +s 𝑦𝐿) +s 𝑧))
59		oveq1 7428	. . . . . . . . . . . . . 14 ⊢ (𝑦𝑂 = 𝑦𝐿 → (𝑦𝑂 +s 𝑧) = (𝑦𝐿 +s 𝑧))
60	59	oveq2d 7437	. . . . . . . . . . . . 13 ⊢ (𝑦𝑂 = 𝑦𝐿 → (𝑥 +s (𝑦𝑂 +s 𝑧)) = (𝑥 +s (𝑦𝐿 +s 𝑧)))
61	58, 60	eqeq12d 2776	. . . . . . . . . . . 12 ⊢ (𝑦𝑂 = 𝑦𝐿 → (((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ↔ ((𝑥 +s 𝑦𝐿) +s 𝑧) = (𝑥 +s (𝑦𝐿 +s 𝑧))))
62		simplr2 1235	. . . . . . . . . . . 12 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑦𝐿 ∈ (L‘𝑦)) → ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)))
63		elun1 4180	. . . . . . . . . . . . 13 ⊢ (𝑦𝐿 ∈ (L‘𝑦) → 𝑦𝐿 ∈ ((L‘𝑦) ∪ (R‘𝑦)))
64	63	adantl 487	. . . . . . . . . . . 12 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑦𝐿 ∈ (L‘𝑦)) → 𝑦𝐿 ∈ ((L‘𝑦) ∪ (R‘𝑦)))
65	61, 62, 64	rspcdva 3577	. . . . . . . . . . 11 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑦𝐿 ∈ (L‘𝑦)) → ((𝑥 +s 𝑦𝐿) +s 𝑧) = (𝑥 +s (𝑦𝐿 +s 𝑧)))
66	65	eqeq2d 2771	. . . . . . . . . 10 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑦𝐿 ∈ (L‘𝑦)) → (𝑏 = ((𝑥 +s 𝑦𝐿) +s 𝑧) ↔ 𝑏 = (𝑥 +s (𝑦𝐿 +s 𝑧))))
67	66	rexbidva 3184	. . . . . . . . 9 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → (∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = ((𝑥 +s 𝑦𝐿) +s 𝑧) ↔ ∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = (𝑥 +s (𝑦𝐿 +s 𝑧))))
68	67	abbidv 2826	. . . . . . . 8 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → {𝑏 ∣ ∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = ((𝑥 +s 𝑦𝐿) +s 𝑧)} = {𝑏 ∣ ∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = (𝑥 +s (𝑦𝐿 +s 𝑧))})
69	56, 68	uneq12d 4168	. . . . . . 7 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → ({𝑎 ∣ ∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = ((𝑥𝐿 +s 𝑦) +s 𝑧)} ∪ {𝑏 ∣ ∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = ((𝑥 +s 𝑦𝐿) +s 𝑧)}) = ({𝑎 ∣ ∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = (𝑥𝐿 +s (𝑦 +s 𝑧))} ∪ {𝑏 ∣ ∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = (𝑥 +s (𝑦𝐿 +s 𝑧))}))
70		oveq2 7429	. . . . . . . . . . . 12 ⊢ (𝑧𝑂 = 𝑧𝐿 → ((𝑥 +s 𝑦) +s 𝑧𝑂) = ((𝑥 +s 𝑦) +s 𝑧𝐿))
71		oveq2 7429	. . . . . . . . . . . . 13 ⊢ (𝑧𝑂 = 𝑧𝐿 → (𝑦 +s 𝑧𝑂) = (𝑦 +s 𝑧𝐿))
72	71	oveq2d 7437	. . . . . . . . . . . 12 ⊢ (𝑧𝑂 = 𝑧𝐿 → (𝑥 +s (𝑦 +s 𝑧𝑂)) = (𝑥 +s (𝑦 +s 𝑧𝐿)))
73	70, 72	eqeq12d 2776	. . . . . . . . . . 11 ⊢ (𝑧𝑂 = 𝑧𝐿 → (((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)) ↔ ((𝑥 +s 𝑦) +s 𝑧𝐿) = (𝑥 +s (𝑦 +s 𝑧𝐿))))
74		simplr3 1236	. . . . . . . . . . 11 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑧𝐿 ∈ (L‘𝑧)) → ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))
75		elun1 4180	. . . . . . . . . . . 12 ⊢ (𝑧𝐿 ∈ (L‘𝑧) → 𝑧𝐿 ∈ ((L‘𝑧) ∪ (R‘𝑧)))
76	75	adantl 487	. . . . . . . . . . 11 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑧𝐿 ∈ (L‘𝑧)) → 𝑧𝐿 ∈ ((L‘𝑧) ∪ (R‘𝑧)))
77	73, 74, 76	rspcdva 3577	. . . . . . . . . 10 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑧𝐿 ∈ (L‘𝑧)) → ((𝑥 +s 𝑦) +s 𝑧𝐿) = (𝑥 +s (𝑦 +s 𝑧𝐿)))
78	77	eqeq2d 2771	. . . . . . . . 9 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑧𝐿 ∈ (L‘𝑧)) → (𝑐 = ((𝑥 +s 𝑦) +s 𝑧𝐿) ↔ 𝑐 = (𝑥 +s (𝑦 +s 𝑧𝐿))))
79	78	rexbidva 3184	. . . . . . . 8 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → (∃𝑧𝐿 ∈ (L‘𝑧)𝑐 = ((𝑥 +s 𝑦) +s 𝑧𝐿) ↔ ∃𝑧𝐿 ∈ (L‘𝑧)𝑐 = (𝑥 +s (𝑦 +s 𝑧𝐿))))
80	79	abbidv 2826	. . . . . . 7 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → {𝑐 ∣ ∃𝑧𝐿 ∈ (L‘𝑧)𝑐 = ((𝑥 +s 𝑦) +s 𝑧𝐿)} = {𝑐 ∣ ∃𝑧𝐿 ∈ (L‘𝑧)𝑐 = (𝑥 +s (𝑦 +s 𝑧𝐿))})
81	69, 80	uneq12d 4168	. . . . . 6 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → (({𝑎 ∣ ∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = ((𝑥𝐿 +s 𝑦) +s 𝑧)} ∪ {𝑏 ∣ ∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = ((𝑥 +s 𝑦𝐿) +s 𝑧)}) ∪ {𝑐 ∣ ∃𝑧𝐿 ∈ (L‘𝑧)𝑐 = ((𝑥 +s 𝑦) +s 𝑧𝐿)}) = (({𝑎 ∣ ∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = (𝑥𝐿 +s (𝑦 +s 𝑧))} ∪ {𝑏 ∣ ∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = (𝑥 +s (𝑦𝐿 +s 𝑧))}) ∪ {𝑐 ∣ ∃𝑧𝐿 ∈ (L‘𝑧)𝑐 = (𝑥 +s (𝑦 +s 𝑧𝐿))}))
82		oveq1 7428	. . . . . . . . . . . . . 14 ⊢ (𝑥𝑂 = 𝑥𝑅 → (𝑥𝑂 +s 𝑦) = (𝑥𝑅 +s 𝑦))
83	82	oveq1d 7436	. . . . . . . . . . . . 13 ⊢ (𝑥𝑂 = 𝑥𝑅 → ((𝑥𝑂 +s 𝑦) +s 𝑧) = ((𝑥𝑅 +s 𝑦) +s 𝑧))
84		oveq1 7428	. . . . . . . . . . . . 13 ⊢ (𝑥𝑂 = 𝑥𝑅 → (𝑥𝑂 +s (𝑦 +s 𝑧)) = (𝑥𝑅 +s (𝑦 +s 𝑧)))
85	83, 84	eqeq12d 2776	. . . . . . . . . . . 12 ⊢ (𝑥𝑂 = 𝑥𝑅 → (((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ↔ ((𝑥𝑅 +s 𝑦) +s 𝑧) = (𝑥𝑅 +s (𝑦 +s 𝑧))))
86		simplr1 1234	. . . . . . . . . . . 12 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑥𝑅 ∈ (R‘𝑥)) → ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)))
87		elun2 4181	. . . . . . . . . . . . 13 ⊢ (𝑥𝑅 ∈ (R‘𝑥) → 𝑥𝑅 ∈ ((L‘𝑥) ∪ (R‘𝑥)))
88	87	adantl 487	. . . . . . . . . . . 12 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑥𝑅 ∈ (R‘𝑥)) → 𝑥𝑅 ∈ ((L‘𝑥) ∪ (R‘𝑥)))
89	85, 86, 88	rspcdva 3577	. . . . . . . . . . 11 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑥𝑅 ∈ (R‘𝑥)) → ((𝑥𝑅 +s 𝑦) +s 𝑧) = (𝑥𝑅 +s (𝑦 +s 𝑧)))
90	89	eqeq2d 2771	. . . . . . . . . 10 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑥𝑅 ∈ (R‘𝑥)) → (𝑑 = ((𝑥𝑅 +s 𝑦) +s 𝑧) ↔ 𝑑 = (𝑥𝑅 +s (𝑦 +s 𝑧))))
91	90	rexbidva 3184	. . . . . . . . 9 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → (∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = ((𝑥𝑅 +s 𝑦) +s 𝑧) ↔ ∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = (𝑥𝑅 +s (𝑦 +s 𝑧))))
92	91	abbidv 2826	. . . . . . . 8 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → {𝑑 ∣ ∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = ((𝑥𝑅 +s 𝑦) +s 𝑧)} = {𝑑 ∣ ∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = (𝑥𝑅 +s (𝑦 +s 𝑧))})
93		oveq2 7429	. . . . . . . . . . . . . 14 ⊢ (𝑦𝑂 = 𝑦𝑅 → (𝑥 +s 𝑦𝑂) = (𝑥 +s 𝑦𝑅))
94	93	oveq1d 7436	. . . . . . . . . . . . 13 ⊢ (𝑦𝑂 = 𝑦𝑅 → ((𝑥 +s 𝑦𝑂) +s 𝑧) = ((𝑥 +s 𝑦𝑅) +s 𝑧))
95		oveq1 7428	. . . . . . . . . . . . . 14 ⊢ (𝑦𝑂 = 𝑦𝑅 → (𝑦𝑂 +s 𝑧) = (𝑦𝑅 +s 𝑧))
96	95	oveq2d 7437	. . . . . . . . . . . . 13 ⊢ (𝑦𝑂 = 𝑦𝑅 → (𝑥 +s (𝑦𝑂 +s 𝑧)) = (𝑥 +s (𝑦𝑅 +s 𝑧)))
97	94, 96	eqeq12d 2776	. . . . . . . . . . . 12 ⊢ (𝑦𝑂 = 𝑦𝑅 → (((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ↔ ((𝑥 +s 𝑦𝑅) +s 𝑧) = (𝑥 +s (𝑦𝑅 +s 𝑧))))
98		simplr2 1235	. . . . . . . . . . . 12 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑦𝑅 ∈ (R‘𝑦)) → ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)))
99		elun2 4181	. . . . . . . . . . . . 13 ⊢ (𝑦𝑅 ∈ (R‘𝑦) → 𝑦𝑅 ∈ ((L‘𝑦) ∪ (R‘𝑦)))
100	99	adantl 487	. . . . . . . . . . . 12 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑦𝑅 ∈ (R‘𝑦)) → 𝑦𝑅 ∈ ((L‘𝑦) ∪ (R‘𝑦)))
101	97, 98, 100	rspcdva 3577	. . . . . . . . . . 11 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑦𝑅 ∈ (R‘𝑦)) → ((𝑥 +s 𝑦𝑅) +s 𝑧) = (𝑥 +s (𝑦𝑅 +s 𝑧)))
102	101	eqeq2d 2771	. . . . . . . . . 10 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑦𝑅 ∈ (R‘𝑦)) → (𝑒 = ((𝑥 +s 𝑦𝑅) +s 𝑧) ↔ 𝑒 = (𝑥 +s (𝑦𝑅 +s 𝑧))))
103	102	rexbidva 3184	. . . . . . . . 9 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → (∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = ((𝑥 +s 𝑦𝑅) +s 𝑧) ↔ ∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = (𝑥 +s (𝑦𝑅 +s 𝑧))))
104	103	abbidv 2826	. . . . . . . 8 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → {𝑒 ∣ ∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = ((𝑥 +s 𝑦𝑅) +s 𝑧)} = {𝑒 ∣ ∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = (𝑥 +s (𝑦𝑅 +s 𝑧))})
105	92, 104	uneq12d 4168	. . . . . . 7 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → ({𝑑 ∣ ∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = ((𝑥𝑅 +s 𝑦) +s 𝑧)} ∪ {𝑒 ∣ ∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = ((𝑥 +s 𝑦𝑅) +s 𝑧)}) = ({𝑑 ∣ ∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = (𝑥𝑅 +s (𝑦 +s 𝑧))} ∪ {𝑒 ∣ ∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = (𝑥 +s (𝑦𝑅 +s 𝑧))}))
106		oveq2 7429	. . . . . . . . . . . 12 ⊢ (𝑧𝑂 = 𝑧𝑅 → ((𝑥 +s 𝑦) +s 𝑧𝑂) = ((𝑥 +s 𝑦) +s 𝑧𝑅))
107		oveq2 7429	. . . . . . . . . . . . 13 ⊢ (𝑧𝑂 = 𝑧𝑅 → (𝑦 +s 𝑧𝑂) = (𝑦 +s 𝑧𝑅))
108	107	oveq2d 7437	. . . . . . . . . . . 12 ⊢ (𝑧𝑂 = 𝑧𝑅 → (𝑥 +s (𝑦 +s 𝑧𝑂)) = (𝑥 +s (𝑦 +s 𝑧𝑅)))
109	106, 108	eqeq12d 2776	. . . . . . . . . . 11 ⊢ (𝑧𝑂 = 𝑧𝑅 → (((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)) ↔ ((𝑥 +s 𝑦) +s 𝑧𝑅) = (𝑥 +s (𝑦 +s 𝑧𝑅))))
110		simplr3 1236	. . . . . . . . . . 11 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑧𝑅 ∈ (R‘𝑧)) → ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))
111		elun2 4181	. . . . . . . . . . . 12 ⊢ (𝑧𝑅 ∈ (R‘𝑧) → 𝑧𝑅 ∈ ((L‘𝑧) ∪ (R‘𝑧)))
112	111	adantl 487	. . . . . . . . . . 11 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑧𝑅 ∈ (R‘𝑧)) → 𝑧𝑅 ∈ ((L‘𝑧) ∪ (R‘𝑧)))
113	109, 110, 112	rspcdva 3577	. . . . . . . . . 10 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑧𝑅 ∈ (R‘𝑧)) → ((𝑥 +s 𝑦) +s 𝑧𝑅) = (𝑥 +s (𝑦 +s 𝑧𝑅)))
114	113	eqeq2d 2771	. . . . . . . . 9 ⊢ ((((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) ∧ 𝑧𝑅 ∈ (R‘𝑧)) → (𝑓 = ((𝑥 +s 𝑦) +s 𝑧𝑅) ↔ 𝑓 = (𝑥 +s (𝑦 +s 𝑧𝑅))))
115	114	rexbidva 3184	. . . . . . . 8 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → (∃𝑧𝑅 ∈ (R‘𝑧)𝑓 = ((𝑥 +s 𝑦) +s 𝑧𝑅) ↔ ∃𝑧𝑅 ∈ (R‘𝑧)𝑓 = (𝑥 +s (𝑦 +s 𝑧𝑅))))
116	115	abbidv 2826	. . . . . . 7 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → {𝑓 ∣ ∃𝑧𝑅 ∈ (R‘𝑧)𝑓 = ((𝑥 +s 𝑦) +s 𝑧𝑅)} = {𝑓 ∣ ∃𝑧𝑅 ∈ (R‘𝑧)𝑓 = (𝑥 +s (𝑦 +s 𝑧𝑅))})
117	105, 116	uneq12d 4168	. . . . . 6 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → (({𝑑 ∣ ∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = ((𝑥𝑅 +s 𝑦) +s 𝑧)} ∪ {𝑒 ∣ ∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = ((𝑥 +s 𝑦𝑅) +s 𝑧)}) ∪ {𝑓 ∣ ∃𝑧𝑅 ∈ (R‘𝑧)𝑓 = ((𝑥 +s 𝑦) +s 𝑧𝑅)}) = (({𝑑 ∣ ∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = (𝑥𝑅 +s (𝑦 +s 𝑧))} ∪ {𝑒 ∣ ∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = (𝑥 +s (𝑦𝑅 +s 𝑧))}) ∪ {𝑓 ∣ ∃𝑧𝑅 ∈ (R‘𝑧)𝑓 = (𝑥 +s (𝑦 +s 𝑧𝑅))}))
118	81, 117	oveq12d 7439	. . . . 5 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → ((({𝑎 ∣ ∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = ((𝑥𝐿 +s 𝑦) +s 𝑧)} ∪ {𝑏 ∣ ∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = ((𝑥 +s 𝑦𝐿) +s 𝑧)}) ∪ {𝑐 ∣ ∃𝑧𝐿 ∈ (L‘𝑧)𝑐 = ((𝑥 +s 𝑦) +s 𝑧𝐿)}) |s (({𝑑 ∣ ∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = ((𝑥𝑅 +s 𝑦) +s 𝑧)} ∪ {𝑒 ∣ ∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = ((𝑥 +s 𝑦𝑅) +s 𝑧)}) ∪ {𝑓 ∣ ∃𝑧𝑅 ∈ (R‘𝑧)𝑓 = ((𝑥 +s 𝑦) +s 𝑧𝑅)})) = ((({𝑎 ∣ ∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = (𝑥𝐿 +s (𝑦 +s 𝑧))} ∪ {𝑏 ∣ ∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = (𝑥 +s (𝑦𝐿 +s 𝑧))}) ∪ {𝑐 ∣ ∃𝑧𝐿 ∈ (L‘𝑧)𝑐 = (𝑥 +s (𝑦 +s 𝑧𝐿))}) |s (({𝑑 ∣ ∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = (𝑥𝑅 +s (𝑦 +s 𝑧))} ∪ {𝑒 ∣ ∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = (𝑥 +s (𝑦𝑅 +s 𝑧))}) ∪ {𝑓 ∣ ∃𝑧𝑅 ∈ (R‘𝑧)𝑓 = (𝑥 +s (𝑦 +s 𝑧𝑅))})))
119		simpl1 1210	. . . . . 6 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → 𝑥 ∈ No)
120		simpl2 1211	. . . . . 6 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → 𝑦 ∈ No)
121		simpl3 1212	. . . . . 6 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → 𝑧 ∈ No)
122	119, 120, 121	addsasslem1 28395	. . . . 5 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → ((𝑥 +s 𝑦) +s 𝑧) = ((({𝑎 ∣ ∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = ((𝑥𝐿 +s 𝑦) +s 𝑧)} ∪ {𝑏 ∣ ∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = ((𝑥 +s 𝑦𝐿) +s 𝑧)}) ∪ {𝑐 ∣ ∃𝑧𝐿 ∈ (L‘𝑧)𝑐 = ((𝑥 +s 𝑦) +s 𝑧𝐿)}) |s (({𝑑 ∣ ∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = ((𝑥𝑅 +s 𝑦) +s 𝑧)} ∪ {𝑒 ∣ ∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = ((𝑥 +s 𝑦𝑅) +s 𝑧)}) ∪ {𝑓 ∣ ∃𝑧𝑅 ∈ (R‘𝑧)𝑓 = ((𝑥 +s 𝑦) +s 𝑧𝑅)})))
123	119, 120, 121	addsasslem2 28396	. . . . 5 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → (𝑥 +s (𝑦 +s 𝑧)) = ((({𝑎 ∣ ∃𝑥𝐿 ∈ (L‘𝑥)𝑎 = (𝑥𝐿 +s (𝑦 +s 𝑧))} ∪ {𝑏 ∣ ∃𝑦𝐿 ∈ (L‘𝑦)𝑏 = (𝑥 +s (𝑦𝐿 +s 𝑧))}) ∪ {𝑐 ∣ ∃𝑧𝐿 ∈ (L‘𝑧)𝑐 = (𝑥 +s (𝑦 +s 𝑧𝐿))}) |s (({𝑑 ∣ ∃𝑥𝑅 ∈ (R‘𝑥)𝑑 = (𝑥𝑅 +s (𝑦 +s 𝑧))} ∪ {𝑒 ∣ ∃𝑦𝑅 ∈ (R‘𝑦)𝑒 = (𝑥 +s (𝑦𝑅 +s 𝑧))}) ∪ {𝑓 ∣ ∃𝑧𝑅 ∈ (R‘𝑧)𝑓 = (𝑥 +s (𝑦 +s 𝑧𝑅))})))
124	118, 122, 123	3eqtr4d 2805	. . . 4 ⊢ (((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂)))) → ((𝑥 +s 𝑦) +s 𝑧) = (𝑥 +s (𝑦 +s 𝑧)))
125	124	ex 418	. . 3 ⊢ ((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) → ((∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂))) → ((𝑥 +s 𝑦) +s 𝑧) = (𝑥 +s (𝑦 +s 𝑧))))
126	45, 125	syl5 35	. 2 ⊢ ((𝑥 ∈ No ∧ 𝑦 ∈ No ∧ 𝑧 ∈ No) → (((∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥𝑂 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧𝑂)) ∧ ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥𝑂 +s 𝑦𝑂) +s 𝑧) = (𝑥𝑂 +s (𝑦𝑂 +s 𝑧)) ∧ ∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥𝑂 +s 𝑦) +s 𝑧𝑂) = (𝑥𝑂 +s (𝑦 +s 𝑧𝑂))) ∧ (∀𝑥𝑂 ∈ ((L‘𝑥) ∪ (R‘𝑥))((𝑥𝑂 +s 𝑦) +s 𝑧) = (𝑥𝑂 +s (𝑦 +s 𝑧)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦𝑂) +s 𝑧𝑂) = (𝑥 +s (𝑦𝑂 +s 𝑧𝑂)) ∧ ∀𝑦𝑂 ∈ ((L‘𝑦) ∪ (R‘𝑦))((𝑥 +s 𝑦𝑂) +s 𝑧) = (𝑥 +s (𝑦𝑂 +s 𝑧))) ∧ ∀𝑧𝑂 ∈ ((L‘𝑧) ∪ (R‘𝑧))((𝑥 +s 𝑦) +s 𝑧𝑂) = (𝑥 +s (𝑦 +s 𝑧𝑂))) → ((𝑥 +s 𝑦) +s 𝑧) = (𝑥 +s (𝑦 +s 𝑧))))
127	4, 9, 13, 17, 22, 25, 28, 32, 37, 41, 126	no3inds 28350	1 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ 𝐶 ∈ No) → ((𝐴 +s 𝐵) +s 𝐶) = (𝐴 +s (𝐵 +s 𝐶)))

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∧ w3a 1103   = wceq 1569   ∈ wcel 2144  {cab 2738  ∀wral 3076  ∃wrex 3086   ∪ cun 4149  ‘cfv 6539  (class class class)co 7421  Nocsur 28003   |s ccuts 28151  Lcleft 28217  Rcright 28218   +_s cadds 28351

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-rep 5231  ax-sep 5248  ax-nul 5259  ax-pow 5326  ax-pr 5390  ax-un 7752

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-rmo 3365  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-pss 4014  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4585  df-pr 4587  df-tp 4589  df-op 4835  df-ot 4858  df-uni 4867  df-int 4907  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-tr 5212  df-id 5545  df-eprel 5550  df-po 5558  df-so 5559  df-fr 5603  df-se 5604  df-we 5605  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-pred 6304  df-ord 6365  df-on 6366  df-suc 6368  df-iota 6494  df-fun 6541  df-fn 6542  df-f 6543  df-f1 6544  df-fo 6545  df-f1o 6546  df-fv 6547  df-riota 7378  df-ov 7424  df-oprab 7425  df-mpo 7426  df-1st 8002  df-2nd 8003  df-frecs 8303  df-wrecs 8334  df-recs 8383  df-1o 8480  df-2o 8481  df-nadd 8679  df-no 28006  df-lts 28007  df-bday 28008  df-les 28108  df-slts 28150  df-cuts 28152  df-0s 28199  df-made 28219  df-old 28220  df-left 28222  df-right 28223  df-norec2 28341  df-adds 28352

This theorem is used by:  addsassd  28398  zsoring  28801