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Theorem latdisdlem 18445

Description: Lemma for latdisd 18446. (Contributed by Stefan O'Rear, 30-Jan-2015.)

**Hypotheses**
Ref	Expression
latdisd.b	⊢ 𝐵 = (Base‘𝐾)
latdisd.j	⊢ ∨ = (join‘𝐾)
latdisd.m	⊢ ∧ = (meet‘𝐾)

**Assertion**
Ref	Expression
latdisdlem	⊢ (𝐾 ∈ Lat → (∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤)) → ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 (𝑥 ∧ (𝑦 ∨ 𝑧)) = ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑧))))

Distinct variable groups: 𝑣,𝑢,𝑤,𝑥,𝑦,𝑧,𝐾 𝑢,𝐵,𝑣,𝑤,𝑥,𝑦,𝑧 𝑢, ∨ ,𝑣,𝑤,𝑥,𝑦,𝑧 𝑢, ∧ ,𝑣,𝑤,𝑥,𝑦,𝑧

**Proof of Theorem latdisdlem**
Step	Hyp	Ref	Expression
1		latdisd.b	. . . . . . . . 9 ⊢ 𝐵 = (Base‘𝐾)
2		latdisd.m	. . . . . . . . 9 ⊢ ∧ = (meet‘𝐾)
3	1, 2	latmcl 18389	. . . . . . . 8 ⊢ ((𝐾 ∈ Lat ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (𝑥 ∧ 𝑦) ∈ 𝐵)
4	3	3adant3r3 1184	. . . . . . 7 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑥 ∧ 𝑦) ∈ 𝐵)
5		simpr1 1194	. . . . . . 7 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑥 ∈ 𝐵)
6		simpr3 1196	. . . . . . 7 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑧 ∈ 𝐵)
7		oveq1 7412	. . . . . . . . 9 ⊢ (𝑢 = (𝑥 ∧ 𝑦) → (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑥 ∧ 𝑦) ∨ (𝑣 ∧ 𝑤)))
8		oveq1 7412	. . . . . . . . . 10 ⊢ (𝑢 = (𝑥 ∧ 𝑦) → (𝑢 ∨ 𝑣) = ((𝑥 ∧ 𝑦) ∨ 𝑣))
9		oveq1 7412	. . . . . . . . . 10 ⊢ (𝑢 = (𝑥 ∧ 𝑦) → (𝑢 ∨ 𝑤) = ((𝑥 ∧ 𝑦) ∨ 𝑤))
10	8, 9	oveq12d 7423	. . . . . . . . 9 ⊢ (𝑢 = (𝑥 ∧ 𝑦) → ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤)) = (((𝑥 ∧ 𝑦) ∨ 𝑣) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑤)))
11	7, 10	eqeq12d 2748	. . . . . . . 8 ⊢ (𝑢 = (𝑥 ∧ 𝑦) → ((𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤)) ↔ ((𝑥 ∧ 𝑦) ∨ (𝑣 ∧ 𝑤)) = (((𝑥 ∧ 𝑦) ∨ 𝑣) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑤))))
12		oveq1 7412	. . . . . . . . . 10 ⊢ (𝑣 = 𝑥 → (𝑣 ∧ 𝑤) = (𝑥 ∧ 𝑤))
13	12	oveq2d 7421	. . . . . . . . 9 ⊢ (𝑣 = 𝑥 → ((𝑥 ∧ 𝑦) ∨ (𝑣 ∧ 𝑤)) = ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑤)))
14		oveq2 7413	. . . . . . . . . 10 ⊢ (𝑣 = 𝑥 → ((𝑥 ∧ 𝑦) ∨ 𝑣) = ((𝑥 ∧ 𝑦) ∨ 𝑥))
15	14	oveq1d 7420	. . . . . . . . 9 ⊢ (𝑣 = 𝑥 → (((𝑥 ∧ 𝑦) ∨ 𝑣) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑤)) = (((𝑥 ∧ 𝑦) ∨ 𝑥) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑤)))
16	13, 15	eqeq12d 2748	. . . . . . . 8 ⊢ (𝑣 = 𝑥 → (((𝑥 ∧ 𝑦) ∨ (𝑣 ∧ 𝑤)) = (((𝑥 ∧ 𝑦) ∨ 𝑣) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑤)) ↔ ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑤)) = (((𝑥 ∧ 𝑦) ∨ 𝑥) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑤))))
17		oveq2 7413	. . . . . . . . . 10 ⊢ (𝑤 = 𝑧 → (𝑥 ∧ 𝑤) = (𝑥 ∧ 𝑧))
18	17	oveq2d 7421	. . . . . . . . 9 ⊢ (𝑤 = 𝑧 → ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑤)) = ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑧)))
19		oveq2 7413	. . . . . . . . . 10 ⊢ (𝑤 = 𝑧 → ((𝑥 ∧ 𝑦) ∨ 𝑤) = ((𝑥 ∧ 𝑦) ∨ 𝑧))
20	19	oveq2d 7421	. . . . . . . . 9 ⊢ (𝑤 = 𝑧 → (((𝑥 ∧ 𝑦) ∨ 𝑥) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑤)) = (((𝑥 ∧ 𝑦) ∨ 𝑥) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑧)))
21	18, 20	eqeq12d 2748	. . . . . . . 8 ⊢ (𝑤 = 𝑧 → (((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑤)) = (((𝑥 ∧ 𝑦) ∨ 𝑥) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑤)) ↔ ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑧)) = (((𝑥 ∧ 𝑦) ∨ 𝑥) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑧))))
22	11, 16, 21	rspc3v 3626	. . . . . . 7 ⊢ (((𝑥 ∧ 𝑦) ∈ 𝐵 ∧ 𝑥 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → (∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤)) → ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑧)) = (((𝑥 ∧ 𝑦) ∨ 𝑥) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑧))))
23	4, 5, 6, 22	syl3anc 1371	. . . . . 6 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤)) → ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑧)) = (((𝑥 ∧ 𝑦) ∨ 𝑥) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑧))))
24	23	imp 407	. . . . 5 ⊢ (((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) ∧ ∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤))) → ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑧)) = (((𝑥 ∧ 𝑦) ∨ 𝑥) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑧)))
25		simpl 483	. . . . . . . . 9 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝐾 ∈ Lat)
26		latdisd.j	. . . . . . . . . 10 ⊢ ∨ = (join‘𝐾)
27	1, 26	latjcom 18396	. . . . . . . . 9 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∧ 𝑦) ∈ 𝐵 ∧ 𝑥 ∈ 𝐵) → ((𝑥 ∧ 𝑦) ∨ 𝑥) = (𝑥 ∨ (𝑥 ∧ 𝑦)))
28	25, 4, 5, 27	syl3anc 1371	. . . . . . . 8 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑥 ∧ 𝑦) ∨ 𝑥) = (𝑥 ∨ (𝑥 ∧ 𝑦)))
29	1, 26, 2	latabs1 18424	. . . . . . . . 9 ⊢ ((𝐾 ∈ Lat ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (𝑥 ∨ (𝑥 ∧ 𝑦)) = 𝑥)
30	29	3adant3r3 1184	. . . . . . . 8 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑥 ∨ (𝑥 ∧ 𝑦)) = 𝑥)
31	28, 30	eqtrd 2772	. . . . . . 7 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑥 ∧ 𝑦) ∨ 𝑥) = 𝑥)
32	1, 26	latjcom 18396	. . . . . . . 8 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∧ 𝑦) ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → ((𝑥 ∧ 𝑦) ∨ 𝑧) = (𝑧 ∨ (𝑥 ∧ 𝑦)))
33	25, 4, 6, 32	syl3anc 1371	. . . . . . 7 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑥 ∧ 𝑦) ∨ 𝑧) = (𝑧 ∨ (𝑥 ∧ 𝑦)))
34	31, 33	oveq12d 7423	. . . . . 6 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (((𝑥 ∧ 𝑦) ∨ 𝑥) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑧)) = (𝑥 ∧ (𝑧 ∨ (𝑥 ∧ 𝑦))))
35	34	adantr 481	. . . . 5 ⊢ (((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) ∧ ∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤))) → (((𝑥 ∧ 𝑦) ∨ 𝑥) ∧ ((𝑥 ∧ 𝑦) ∨ 𝑧)) = (𝑥 ∧ (𝑧 ∨ (𝑥 ∧ 𝑦))))
36		simpr2 1195	. . . . . . . . 9 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑦 ∈ 𝐵)
37		oveq1 7412	. . . . . . . . . . 11 ⊢ (𝑢 = 𝑧 → (𝑢 ∨ (𝑣 ∧ 𝑤)) = (𝑧 ∨ (𝑣 ∧ 𝑤)))
38		oveq1 7412	. . . . . . . . . . . 12 ⊢ (𝑢 = 𝑧 → (𝑢 ∨ 𝑣) = (𝑧 ∨ 𝑣))
39		oveq1 7412	. . . . . . . . . . . 12 ⊢ (𝑢 = 𝑧 → (𝑢 ∨ 𝑤) = (𝑧 ∨ 𝑤))
40	38, 39	oveq12d 7423	. . . . . . . . . . 11 ⊢ (𝑢 = 𝑧 → ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤)) = ((𝑧 ∨ 𝑣) ∧ (𝑧 ∨ 𝑤)))
41	37, 40	eqeq12d 2748	. . . . . . . . . 10 ⊢ (𝑢 = 𝑧 → ((𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤)) ↔ (𝑧 ∨ (𝑣 ∧ 𝑤)) = ((𝑧 ∨ 𝑣) ∧ (𝑧 ∨ 𝑤))))
42	12	oveq2d 7421	. . . . . . . . . . 11 ⊢ (𝑣 = 𝑥 → (𝑧 ∨ (𝑣 ∧ 𝑤)) = (𝑧 ∨ (𝑥 ∧ 𝑤)))
43		oveq2 7413	. . . . . . . . . . . 12 ⊢ (𝑣 = 𝑥 → (𝑧 ∨ 𝑣) = (𝑧 ∨ 𝑥))
44	43	oveq1d 7420	. . . . . . . . . . 11 ⊢ (𝑣 = 𝑥 → ((𝑧 ∨ 𝑣) ∧ (𝑧 ∨ 𝑤)) = ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑤)))
45	42, 44	eqeq12d 2748	. . . . . . . . . 10 ⊢ (𝑣 = 𝑥 → ((𝑧 ∨ (𝑣 ∧ 𝑤)) = ((𝑧 ∨ 𝑣) ∧ (𝑧 ∨ 𝑤)) ↔ (𝑧 ∨ (𝑥 ∧ 𝑤)) = ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑤))))
46		oveq2 7413	. . . . . . . . . . . 12 ⊢ (𝑤 = 𝑦 → (𝑥 ∧ 𝑤) = (𝑥 ∧ 𝑦))
47	46	oveq2d 7421	. . . . . . . . . . 11 ⊢ (𝑤 = 𝑦 → (𝑧 ∨ (𝑥 ∧ 𝑤)) = (𝑧 ∨ (𝑥 ∧ 𝑦)))
48		oveq2 7413	. . . . . . . . . . . 12 ⊢ (𝑤 = 𝑦 → (𝑧 ∨ 𝑤) = (𝑧 ∨ 𝑦))
49	48	oveq2d 7421	. . . . . . . . . . 11 ⊢ (𝑤 = 𝑦 → ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑤)) = ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑦)))
50	47, 49	eqeq12d 2748	. . . . . . . . . 10 ⊢ (𝑤 = 𝑦 → ((𝑧 ∨ (𝑥 ∧ 𝑤)) = ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑤)) ↔ (𝑧 ∨ (𝑥 ∧ 𝑦)) = ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑦))))
51	41, 45, 50	rspc3v 3626	. . . . . . . . 9 ⊢ ((𝑧 ∈ 𝐵 ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤)) → (𝑧 ∨ (𝑥 ∧ 𝑦)) = ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑦))))
52	6, 5, 36, 51	syl3anc 1371	. . . . . . . 8 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤)) → (𝑧 ∨ (𝑥 ∧ 𝑦)) = ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑦))))
53	52	imp 407	. . . . . . 7 ⊢ (((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) ∧ ∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤))) → (𝑧 ∨ (𝑥 ∧ 𝑦)) = ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑦)))
54	53	oveq2d 7421	. . . . . 6 ⊢ (((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) ∧ ∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤))) → (𝑥 ∧ (𝑧 ∨ (𝑥 ∧ 𝑦))) = (𝑥 ∧ ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑦))))
55	1, 26	latjcl 18388	. . . . . . . . . 10 ⊢ ((𝐾 ∈ Lat ∧ 𝑧 ∈ 𝐵 ∧ 𝑥 ∈ 𝐵) → (𝑧 ∨ 𝑥) ∈ 𝐵)
56	25, 6, 5, 55	syl3anc 1371	. . . . . . . . 9 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑧 ∨ 𝑥) ∈ 𝐵)
57	1, 26	latjcl 18388	. . . . . . . . . 10 ⊢ ((𝐾 ∈ Lat ∧ 𝑧 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (𝑧 ∨ 𝑦) ∈ 𝐵)
58	25, 6, 36, 57	syl3anc 1371	. . . . . . . . 9 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑧 ∨ 𝑦) ∈ 𝐵)
59	1, 2	latmass 18444	. . . . . . . . 9 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ (𝑧 ∨ 𝑥) ∈ 𝐵 ∧ (𝑧 ∨ 𝑦) ∈ 𝐵)) → ((𝑥 ∧ (𝑧 ∨ 𝑥)) ∧ (𝑧 ∨ 𝑦)) = (𝑥 ∧ ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑦))))
60	25, 5, 56, 58, 59	syl13anc 1372	. . . . . . . 8 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑥 ∧ (𝑧 ∨ 𝑥)) ∧ (𝑧 ∨ 𝑦)) = (𝑥 ∧ ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑦))))
61	1, 26	latjcom 18396	. . . . . . . . . . . 12 ⊢ ((𝐾 ∈ Lat ∧ 𝑧 ∈ 𝐵 ∧ 𝑥 ∈ 𝐵) → (𝑧 ∨ 𝑥) = (𝑥 ∨ 𝑧))
62	25, 6, 5, 61	syl3anc 1371	. . . . . . . . . . 11 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑧 ∨ 𝑥) = (𝑥 ∨ 𝑧))
63	62	oveq2d 7421	. . . . . . . . . 10 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑥 ∧ (𝑧 ∨ 𝑥)) = (𝑥 ∧ (𝑥 ∨ 𝑧)))
64	1, 26, 2	latabs2 18425	. . . . . . . . . . 11 ⊢ ((𝐾 ∈ Lat ∧ 𝑥 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → (𝑥 ∧ (𝑥 ∨ 𝑧)) = 𝑥)
65	25, 5, 6, 64	syl3anc 1371	. . . . . . . . . 10 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑥 ∧ (𝑥 ∨ 𝑧)) = 𝑥)
66	63, 65	eqtrd 2772	. . . . . . . . 9 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑥 ∧ (𝑧 ∨ 𝑥)) = 𝑥)
67	1, 26	latjcom 18396	. . . . . . . . . 10 ⊢ ((𝐾 ∈ Lat ∧ 𝑧 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (𝑧 ∨ 𝑦) = (𝑦 ∨ 𝑧))
68	25, 6, 36, 67	syl3anc 1371	. . . . . . . . 9 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑧 ∨ 𝑦) = (𝑦 ∨ 𝑧))
69	66, 68	oveq12d 7423	. . . . . . . 8 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑥 ∧ (𝑧 ∨ 𝑥)) ∧ (𝑧 ∨ 𝑦)) = (𝑥 ∧ (𝑦 ∨ 𝑧)))
70	60, 69	eqtr3d 2774	. . . . . . 7 ⊢ ((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑥 ∧ ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑦))) = (𝑥 ∧ (𝑦 ∨ 𝑧)))
71	70	adantr 481	. . . . . 6 ⊢ (((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) ∧ ∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤))) → (𝑥 ∧ ((𝑧 ∨ 𝑥) ∧ (𝑧 ∨ 𝑦))) = (𝑥 ∧ (𝑦 ∨ 𝑧)))
72	54, 71	eqtrd 2772	. . . . 5 ⊢ (((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) ∧ ∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤))) → (𝑥 ∧ (𝑧 ∨ (𝑥 ∧ 𝑦))) = (𝑥 ∧ (𝑦 ∨ 𝑧)))
73	24, 35, 72	3eqtrrd 2777	. . . 4 ⊢ (((𝐾 ∈ Lat ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) ∧ ∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤))) → (𝑥 ∧ (𝑦 ∨ 𝑧)) = ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑧)))
74	73	an32s 650	. . 3 ⊢ (((𝐾 ∈ Lat ∧ ∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤))) ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑥 ∧ (𝑦 ∨ 𝑧)) = ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑧)))
75	74	ralrimivvva 3203	. 2 ⊢ ((𝐾 ∈ Lat ∧ ∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤))) → ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 (𝑥 ∧ (𝑦 ∨ 𝑧)) = ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑧)))
76	75	ex 413	1 ⊢ (𝐾 ∈ Lat → (∀𝑢 ∈ 𝐵 ∀𝑣 ∈ 𝐵 ∀𝑤 ∈ 𝐵 (𝑢 ∨ (𝑣 ∧ 𝑤)) = ((𝑢 ∨ 𝑣) ∧ (𝑢 ∨ 𝑤)) → ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 (𝑥 ∧ (𝑦 ∨ 𝑧)) = ((𝑥 ∧ 𝑦) ∨ (𝑥 ∧ 𝑧))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ∀wral 3061 ‘cfv 6540 (class class class)co 7405 Basecbs 17140 joincjn 18260 meetcmee 18261 Latclat 18380

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-er 8699 df-en 8936 df-dom 8937 df-sdom 8938 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-nn 12209 df-2 12271 df-3 12272 df-4 12273 df-5 12274 df-6 12275 df-7 12276 df-8 12277 df-9 12278 df-dec 12674 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17141 df-ple 17213 df-odu 18236 df-proset 18244 df-poset 18262 df-lub 18295 df-glb 18296 df-join 18297 df-meet 18298 df-lat 18381

This theorem is referenced by: latdisd 18446

W3C validator