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Theorem latjlej12 18446

Description: Add join to both sides of a lattice ordering. (chlej12i 31284 analog.) (Contributed by NM, 8-Nov-2011.)

**Hypotheses**
Ref	Expression
latlej.b	⊢ 𝐵 = (Base‘𝐾)
latlej.l	⊢ ≤ = (le‘𝐾)
latlej.j	⊢ ∨ = (join‘𝐾)

**Assertion**
Ref	Expression
latjlej12	⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → ((𝑋 ≤ 𝑌 ∧ 𝑍 ≤ 𝑊) → (𝑋 ∨ 𝑍) ≤ (𝑌 ∨ 𝑊)))

**Proof of Theorem latjlej12**
Step	Hyp	Ref	Expression
1		simp1 1134	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → 𝐾 ∈ Lat)
2		simp2l 1197	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → 𝑋 ∈ 𝐵)
3		simp2r 1198	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → 𝑌 ∈ 𝐵)
4		simp3l 1199	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → 𝑍 ∈ 𝐵)
5		latlej.b	. . . 4 ⊢ 𝐵 = (Base‘𝐾)
6		latlej.l	. . . 4 ⊢ ≤ = (le‘𝐾)
7		latlej.j	. . . 4 ⊢ ∨ = (join‘𝐾)
8	5, 6, 7	latjlej1 18444	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (𝑋 ≤ 𝑌 → (𝑋 ∨ 𝑍) ≤ (𝑌 ∨ 𝑍)))
9	1, 2, 3, 4, 8	syl13anc 1370	. 2 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → (𝑋 ≤ 𝑌 → (𝑋 ∨ 𝑍) ≤ (𝑌 ∨ 𝑍)))
10		simp3r 1200	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → 𝑊 ∈ 𝐵)
11	5, 6, 7	latjlej2 18445	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵)) → (𝑍 ≤ 𝑊 → (𝑌 ∨ 𝑍) ≤ (𝑌 ∨ 𝑊)))
12	1, 4, 10, 3, 11	syl13anc 1370	. 2 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → (𝑍 ≤ 𝑊 → (𝑌 ∨ 𝑍) ≤ (𝑌 ∨ 𝑊)))
13	5, 7	latjcl 18430	. . . 4 ⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵) → (𝑋 ∨ 𝑍) ∈ 𝐵)
14	1, 2, 4, 13	syl3anc 1369	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → (𝑋 ∨ 𝑍) ∈ 𝐵)
15	5, 7	latjcl 18430	. . . 4 ⊢ ((𝐾 ∈ Lat ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵) → (𝑌 ∨ 𝑍) ∈ 𝐵)
16	1, 3, 4, 15	syl3anc 1369	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → (𝑌 ∨ 𝑍) ∈ 𝐵)
17	5, 7	latjcl 18430	. . . 4 ⊢ ((𝐾 ∈ Lat ∧ 𝑌 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵) → (𝑌 ∨ 𝑊) ∈ 𝐵)
18	1, 3, 10, 17	syl3anc 1369	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → (𝑌 ∨ 𝑊) ∈ 𝐵)
19	5, 6	lattr 18435	. . 3 ⊢ ((𝐾 ∈ Lat ∧ ((𝑋 ∨ 𝑍) ∈ 𝐵 ∧ (𝑌 ∨ 𝑍) ∈ 𝐵 ∧ (𝑌 ∨ 𝑊) ∈ 𝐵)) → (((𝑋 ∨ 𝑍) ≤ (𝑌 ∨ 𝑍) ∧ (𝑌 ∨ 𝑍) ≤ (𝑌 ∨ 𝑊)) → (𝑋 ∨ 𝑍) ≤ (𝑌 ∨ 𝑊)))
20	1, 14, 16, 18, 19	syl13anc 1370	. 2 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → (((𝑋 ∨ 𝑍) ≤ (𝑌 ∨ 𝑍) ∧ (𝑌 ∨ 𝑍) ≤ (𝑌 ∨ 𝑊)) → (𝑋 ∨ 𝑍) ≤ (𝑌 ∨ 𝑊)))
21	9, 12, 20	syl2and 607	1 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) ∧ (𝑍 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵)) → ((𝑋 ≤ 𝑌 ∧ 𝑍 ≤ 𝑊) → (𝑋 ∨ 𝑍) ≤ (𝑌 ∨ 𝑊)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 class class class wbr 5148 ‘cfv 6548 (class class class)co 7420 Basecbs 17179 lecple 17239 joincjn 18302 Latclat 18422

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-ral 3059 df-rex 3068 df-rmo 3373 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5576 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-riota 7376 df-ov 7423 df-oprab 7424 df-poset 18304 df-lub 18337 df-glb 18338 df-join 18339 df-meet 18340 df-lat 18423

This theorem is referenced by: latledi 18468 dalem-cly 39144 dalem38 39183 dalem44 39189 cdlema1N 39264 pmapjoin 39325 4atexlemc 39542 cdlemg33a 40179

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