Theorem ps-1 36617

Description: The join of two atoms 𝑅 ∨ 𝑆 (specifying a projective geometry line) is determined uniquely by any two atoms (specifying two points) less than or equal to that join. Part of Lemma 16.4 of [MaedaMaeda] p. 69, showing projective space postulate PS1 in [MaedaMaeda] p. 67. (Contributed by NM, 15-Nov-2011.)

Hypotheses

Ref	Expression
ps1.l	⊢ ≤ = (le‘𝐾)
ps1.j	⊢ ∨ = (join‘𝐾)
ps1.a	⊢ 𝐴 = (Atoms‘𝐾)

Assertion

Ref	Expression
ps-1	⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) ↔ (𝑃 ∨ 𝑄) = (𝑅 ∨ 𝑆)))

Proof of Theorem ps-1

Step	Hyp	Ref	Expression
1		oveq1 7166	. . . . . 6 ⊢ (𝑅 = 𝑃 → (𝑅 ∨ 𝑆) = (𝑃 ∨ 𝑆))
2	1	breq2d 5081	. . . . 5 ⊢ (𝑅 = 𝑃 → ((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) ↔ (𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑆)))
3	1	eqeq2d 2835	. . . . 5 ⊢ (𝑅 = 𝑃 → ((𝑃 ∨ 𝑄) = (𝑅 ∨ 𝑆) ↔ (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑆)))
4	2, 3	imbi12d 347	. . . 4 ⊢ (𝑅 = 𝑃 → (((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) → (𝑃 ∨ 𝑄) = (𝑅 ∨ 𝑆)) ↔ ((𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑆) → (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑆))))
5	4	eqcoms 2832	. . 3 ⊢ (𝑃 = 𝑅 → (((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) → (𝑃 ∨ 𝑄) = (𝑅 ∨ 𝑆)) ↔ ((𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑆) → (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑆))))
6		simp3 1134	. . . . . . . . 9 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅 ∧ (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆)) → (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆))
7		simp1 1132	. . . . . . . . . . . 12 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝐾 ∈ HL)
8		simp21 1202	. . . . . . . . . . . 12 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝑃 ∈ 𝐴)
9		simp3l 1197	. . . . . . . . . . . 12 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝑅 ∈ 𝐴)
10		ps1.j	. . . . . . . . . . . . 13 ⊢ ∨ = (join‘𝐾)
11		ps1.a	. . . . . . . . . . . . 13 ⊢ 𝐴 = (Atoms‘𝐾)
12	10, 11	hlatjcom 36508	. . . . . . . . . . . 12 ⊢ ((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴) → (𝑃 ∨ 𝑅) = (𝑅 ∨ 𝑃))
13	7, 8, 9, 12	syl3anc 1367	. . . . . . . . . . 11 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → (𝑃 ∨ 𝑅) = (𝑅 ∨ 𝑃))
14	13	3ad2ant1 1129	. . . . . . . . . 10 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅 ∧ (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆)) → (𝑃 ∨ 𝑅) = (𝑅 ∨ 𝑃))
15		hllat 36503	. . . . . . . . . . . . . . . 16 ⊢ (𝐾 ∈ HL → 𝐾 ∈ Lat)
16	15	3ad2ant1 1129	. . . . . . . . . . . . . . 15 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝐾 ∈ Lat)
17		eqid 2824	. . . . . . . . . . . . . . . . 17 ⊢ (Base‘𝐾) = (Base‘𝐾)
18	17, 11	atbase 36429	. . . . . . . . . . . . . . . 16 ⊢ (𝑃 ∈ 𝐴 → 𝑃 ∈ (Base‘𝐾))
19	8, 18	syl 17	. . . . . . . . . . . . . . 15 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝑃 ∈ (Base‘𝐾))
20		simp22 1203	. . . . . . . . . . . . . . . 16 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝑄 ∈ 𝐴)
21	17, 11	atbase 36429	. . . . . . . . . . . . . . . 16 ⊢ (𝑄 ∈ 𝐴 → 𝑄 ∈ (Base‘𝐾))
22	20, 21	syl 17	. . . . . . . . . . . . . . 15 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝑄 ∈ (Base‘𝐾))
23		simp3r 1198	. . . . . . . . . . . . . . . 16 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝑆 ∈ 𝐴)
24	17, 10, 11	hlatjcl 36507	. . . . . . . . . . . . . . . 16 ⊢ ((𝐾 ∈ HL ∧ 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴) → (𝑅 ∨ 𝑆) ∈ (Base‘𝐾))
25	7, 9, 23, 24	syl3anc 1367	. . . . . . . . . . . . . . 15 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → (𝑅 ∨ 𝑆) ∈ (Base‘𝐾))
26		ps1.l	. . . . . . . . . . . . . . . 16 ⊢ ≤ = (le‘𝐾)
27	17, 26, 10	latjle12 17675	. . . . . . . . . . . . . . 15 ⊢ ((𝐾 ∈ Lat ∧ (𝑃 ∈ (Base‘𝐾) ∧ 𝑄 ∈ (Base‘𝐾) ∧ (𝑅 ∨ 𝑆) ∈ (Base‘𝐾))) → ((𝑃 ≤ (𝑅 ∨ 𝑆) ∧ 𝑄 ≤ (𝑅 ∨ 𝑆)) ↔ (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆)))
28	16, 19, 22, 25, 27	syl13anc 1368	. . . . . . . . . . . . . 14 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ≤ (𝑅 ∨ 𝑆) ∧ 𝑄 ≤ (𝑅 ∨ 𝑆)) ↔ (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆)))
29		simpl 485	. . . . . . . . . . . . . 14 ⊢ ((𝑃 ≤ (𝑅 ∨ 𝑆) ∧ 𝑄 ≤ (𝑅 ∨ 𝑆)) → 𝑃 ≤ (𝑅 ∨ 𝑆))
30	28, 29	syl6bir 256	. . . . . . . . . . . . 13 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) → 𝑃 ≤ (𝑅 ∨ 𝑆)))
31	30	adantr 483	. . . . . . . . . . . 12 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → ((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) → 𝑃 ≤ (𝑅 ∨ 𝑆)))
32		simpl1 1187	. . . . . . . . . . . . 13 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → 𝐾 ∈ HL)
33		simpl21 1247	. . . . . . . . . . . . 13 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → 𝑃 ∈ 𝐴)
34		simpl3r 1225	. . . . . . . . . . . . 13 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → 𝑆 ∈ 𝐴)
35		simpl3l 1224	. . . . . . . . . . . . 13 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → 𝑅 ∈ 𝐴)
36		simpr 487	. . . . . . . . . . . . 13 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → 𝑃 ≠ 𝑅)
37	26, 10, 11	hlatexchb1 36533	. . . . . . . . . . . . 13 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴) ∧ 𝑃 ≠ 𝑅) → (𝑃 ≤ (𝑅 ∨ 𝑆) ↔ (𝑅 ∨ 𝑃) = (𝑅 ∨ 𝑆)))
38	32, 33, 34, 35, 36, 37	syl131anc 1379	. . . . . . . . . . . 12 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → (𝑃 ≤ (𝑅 ∨ 𝑆) ↔ (𝑅 ∨ 𝑃) = (𝑅 ∨ 𝑆)))
39	31, 38	sylibd 241	. . . . . . . . . . 11 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → ((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) → (𝑅 ∨ 𝑃) = (𝑅 ∨ 𝑆)))
40	39	3impia 1113	. . . . . . . . . 10 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅 ∧ (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆)) → (𝑅 ∨ 𝑃) = (𝑅 ∨ 𝑆))
41	14, 40	eqtrd 2859	. . . . . . . . 9 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅 ∧ (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆)) → (𝑃 ∨ 𝑅) = (𝑅 ∨ 𝑆))
42	6, 41	breqtrrd 5097	. . . . . . . 8 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅 ∧ (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆)) → (𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑅))
43	42	3expia 1117	. . . . . . 7 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → ((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) → (𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑅)))
44	17, 10, 11	hlatjcl 36507	. . . . . . . . . . 11 ⊢ ((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴) → (𝑃 ∨ 𝑅) ∈ (Base‘𝐾))
45	7, 8, 9, 44	syl3anc 1367	. . . . . . . . . 10 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → (𝑃 ∨ 𝑅) ∈ (Base‘𝐾))
46	17, 26, 10	latjle12 17675	. . . . . . . . . 10 ⊢ ((𝐾 ∈ Lat ∧ (𝑃 ∈ (Base‘𝐾) ∧ 𝑄 ∈ (Base‘𝐾) ∧ (𝑃 ∨ 𝑅) ∈ (Base‘𝐾))) → ((𝑃 ≤ (𝑃 ∨ 𝑅) ∧ 𝑄 ≤ (𝑃 ∨ 𝑅)) ↔ (𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑅)))
47	16, 19, 22, 45, 46	syl13anc 1368	. . . . . . . . 9 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ≤ (𝑃 ∨ 𝑅) ∧ 𝑄 ≤ (𝑃 ∨ 𝑅)) ↔ (𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑅)))
48		simpr 487	. . . . . . . . . 10 ⊢ ((𝑃 ≤ (𝑃 ∨ 𝑅) ∧ 𝑄 ≤ (𝑃 ∨ 𝑅)) → 𝑄 ≤ (𝑃 ∨ 𝑅))
49		simp23 1204	. . . . . . . . . . . 12 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝑃 ≠ 𝑄)
50	49	necomd 3074	. . . . . . . . . . 11 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝑄 ≠ 𝑃)
51	26, 10, 11	hlatexchb1 36533	. . . . . . . . . . 11 ⊢ ((𝐾 ∈ HL ∧ (𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴 ∧ 𝑃 ∈ 𝐴) ∧ 𝑄 ≠ 𝑃) → (𝑄 ≤ (𝑃 ∨ 𝑅) ↔ (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑅)))
52	7, 20, 9, 8, 50, 51	syl131anc 1379	. . . . . . . . . 10 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → (𝑄 ≤ (𝑃 ∨ 𝑅) ↔ (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑅)))
53	48, 52	syl5ib 246	. . . . . . . . 9 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ≤ (𝑃 ∨ 𝑅) ∧ 𝑄 ≤ (𝑃 ∨ 𝑅)) → (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑅)))
54	47, 53	sylbird 262	. . . . . . . 8 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑅) → (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑅)))
55	54	adantr 483	. . . . . . 7 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → ((𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑅) → (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑅)))
56	43, 55	syld 47	. . . . . 6 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → ((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) → (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑅)))
57	56	3impia 1113	. . . . 5 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅 ∧ (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆)) → (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑅))
58	57, 41	eqtrd 2859	. . . 4 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅 ∧ (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆)) → (𝑃 ∨ 𝑄) = (𝑅 ∨ 𝑆))
59	58	3expia 1117	. . 3 ⊢ (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) ∧ 𝑃 ≠ 𝑅) → ((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) → (𝑃 ∨ 𝑄) = (𝑅 ∨ 𝑆)))
60	17, 10, 11	hlatjcl 36507	. . . . . . 7 ⊢ ((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴) → (𝑃 ∨ 𝑆) ∈ (Base‘𝐾))
61	7, 8, 23, 60	syl3anc 1367	. . . . . 6 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → (𝑃 ∨ 𝑆) ∈ (Base‘𝐾))
62	17, 26, 10	latjle12 17675	. . . . . 6 ⊢ ((𝐾 ∈ Lat ∧ (𝑃 ∈ (Base‘𝐾) ∧ 𝑄 ∈ (Base‘𝐾) ∧ (𝑃 ∨ 𝑆) ∈ (Base‘𝐾))) → ((𝑃 ≤ (𝑃 ∨ 𝑆) ∧ 𝑄 ≤ (𝑃 ∨ 𝑆)) ↔ (𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑆)))
63	16, 19, 22, 61, 62	syl13anc 1368	. . . . 5 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ≤ (𝑃 ∨ 𝑆) ∧ 𝑄 ≤ (𝑃 ∨ 𝑆)) ↔ (𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑆)))
64		simpr 487	. . . . 5 ⊢ ((𝑃 ≤ (𝑃 ∨ 𝑆) ∧ 𝑄 ≤ (𝑃 ∨ 𝑆)) → 𝑄 ≤ (𝑃 ∨ 𝑆))
65	63, 64	syl6bir 256	. . . 4 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑆) → 𝑄 ≤ (𝑃 ∨ 𝑆)))
66	26, 10, 11	hlatexchb1 36533	. . . . 5 ⊢ ((𝐾 ∈ HL ∧ (𝑄 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ∧ 𝑃 ∈ 𝐴) ∧ 𝑄 ≠ 𝑃) → (𝑄 ≤ (𝑃 ∨ 𝑆) ↔ (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑆)))
67	7, 20, 23, 8, 50, 66	syl131anc 1379	. . . 4 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → (𝑄 ≤ (𝑃 ∨ 𝑆) ↔ (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑆)))
68	65, 67	sylibd 241	. . 3 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑆) → (𝑃 ∨ 𝑄) = (𝑃 ∨ 𝑆)))
69	5, 59, 68	pm2.61ne 3105	. 2 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) → (𝑃 ∨ 𝑄) = (𝑅 ∨ 𝑆)))
70	17, 10, 11	hlatjcl 36507	. . . . 5 ⊢ ((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴) → (𝑃 ∨ 𝑄) ∈ (Base‘𝐾))
71	7, 8, 20, 70	syl3anc 1367	. . . 4 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → (𝑃 ∨ 𝑄) ∈ (Base‘𝐾))
72	17, 26	latref 17666	. . . 4 ⊢ ((𝐾 ∈ Lat ∧ (𝑃 ∨ 𝑄) ∈ (Base‘𝐾)) → (𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑄))
73	16, 71, 72	syl2anc 586	. . 3 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → (𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑄))
74		breq2 5073	. . 3 ⊢ ((𝑃 ∨ 𝑄) = (𝑅 ∨ 𝑆) → ((𝑃 ∨ 𝑄) ≤ (𝑃 ∨ 𝑄) ↔ (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆)))
75	73, 74	syl5ibcom 247	. 2 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ∨ 𝑄) = (𝑅 ∨ 𝑆) → (𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆)))
76	69, 75	impbid 214	1 ⊢ ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑃 ≠ 𝑄) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ∨ 𝑄) ≤ (𝑅 ∨ 𝑆) ↔ (𝑃 ∨ 𝑄) = (𝑅 ∨ 𝑆)))

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   ∧ w3a 1083   = wceq 1536   ∈ wcel 2113   ≠ wne 3019   class class class wbr 5069  ‘cfv 6358  (class class class)co 7159  Basecbs 16486  lecple 16575  joincjn 17557  Latclat 17658  Atomscatm 36403  HLchlt 36490

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 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2796  ax-rep 5193  ax-sep 5206  ax-nul 5213  ax-pow 5269  ax-pr 5333  ax-un 7464

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2966  df-ne 3020  df-ral 3146  df-rex 3147  df-reu 3148  df-rab 3150  df-v 3499  df-sbc 3776  df-csb 3887  df-dif 3942  df-un 3944  df-in 3946  df-ss 3955  df-nul 4295  df-if 4471  df-pw 4544  df-sn 4571  df-pr 4573  df-op 4577  df-uni 4842  df-iun 4924  df-br 5070  df-opab 5132  df-mpt 5150  df-id 5463  df-xp 5564  df-rel 5565  df-cnv 5566  df-co 5567  df-dm 5568  df-rn 5569  df-res 5570  df-ima 5571  df-iota 6317  df-fun 6360  df-fn 6361  df-f 6362  df-f1 6363  df-fo 6364  df-f1o 6365  df-fv 6366  df-riota 7117  df-ov 7162  df-oprab 7163  df-proset 17541  df-poset 17559  df-plt 17571  df-lub 17587  df-glb 17588  df-join 17589  df-meet 17590  df-p0 17652  df-lat 17659  df-covers 36406  df-ats 36407  df-atl 36438  df-cvlat 36462  df-hlat 36491

This theorem is referenced by:  2atjlej  36619  hlatexch3N  36620  hlatexch4  36621  2llnjaN  36706  dalem1  36799  lneq2at  36918  2llnma3r  36928  cdleme11c  37401  cdleme11  37410  cdleme35a  37588  cdleme42k  37624  cdlemg8b  37768  cdlemg13a  37791  cdlemg18b  37819  cdlemg42  37869  trljco  37880