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Theorem latj31 18446

Description: Swap 2nd and 3rd members of lattice join. Lemma 2.2 in [MegPav2002] p. 362. (Contributed by NM, 23-Jun-2012.)

**Hypotheses**
Ref	Expression
latjass.b	⊢ 𝐵 = (Base‘𝐾)
latjass.j	⊢ ∨ = (join‘𝐾)

**Assertion**
Ref	Expression
latj31	⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 ∨ 𝑌) ∨ 𝑍) = ((𝑍 ∨ 𝑌) ∨ 𝑋))

**Proof of Theorem latj31**
Step	Hyp	Ref	Expression
1		simpl 482	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → 𝐾 ∈ Lat)
2		simpr3 1197	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → 𝑍 ∈ 𝐵)
3		simpr1 1195	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → 𝑋 ∈ 𝐵)
4		simpr2 1196	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → 𝑌 ∈ 𝐵)
5		latjass.b	. . . 4 ⊢ 𝐵 = (Base‘𝐾)
6		latjass.j	. . . 4 ⊢ ∨ = (join‘𝐾)
7	5, 6	latj12 18443	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑍 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵)) → (𝑍 ∨ (𝑋 ∨ 𝑌)) = (𝑋 ∨ (𝑍 ∨ 𝑌)))
8	1, 2, 3, 4, 7	syl13anc 1374	. 2 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (𝑍 ∨ (𝑋 ∨ 𝑌)) = (𝑋 ∨ (𝑍 ∨ 𝑌)))
9	5, 6	latjcl 18398	. . . 4 ⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 ∨ 𝑌) ∈ 𝐵)
10	9	3adant3r3 1185	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (𝑋 ∨ 𝑌) ∈ 𝐵)
11	5, 6	latjcom 18406	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∨ 𝑌) ∈ 𝐵 ∧ 𝑍 ∈ 𝐵) → ((𝑋 ∨ 𝑌) ∨ 𝑍) = (𝑍 ∨ (𝑋 ∨ 𝑌)))
12	1, 10, 2, 11	syl3anc 1373	. 2 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 ∨ 𝑌) ∨ 𝑍) = (𝑍 ∨ (𝑋 ∨ 𝑌)))
13	5, 6	latjcl 18398	. . . 4 ⊢ ((𝐾 ∈ Lat ∧ 𝑍 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑍 ∨ 𝑌) ∈ 𝐵)
14	1, 2, 4, 13	syl3anc 1373	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (𝑍 ∨ 𝑌) ∈ 𝐵)
15	5, 6	latjcom 18406	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑍 ∨ 𝑌) ∈ 𝐵 ∧ 𝑋 ∈ 𝐵) → ((𝑍 ∨ 𝑌) ∨ 𝑋) = (𝑋 ∨ (𝑍 ∨ 𝑌)))
16	1, 14, 3, 15	syl3anc 1373	. 2 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑍 ∨ 𝑌) ∨ 𝑋) = (𝑋 ∨ (𝑍 ∨ 𝑌)))
17	8, 12, 16	3eqtr4d 2774	1 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 ∨ 𝑌) ∨ 𝑍) = ((𝑍 ∨ 𝑌) ∨ 𝑋))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1086 = wceq 1540 ∈ wcel 2109 ‘cfv 6511 (class class class)co 7387 Basecbs 17179 joincjn 18272 Latclat 18390

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 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5234 ax-sep 5251 ax-nul 5261 ax-pow 5320 ax-pr 5387 ax-un 7711

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-ral 3045 df-rex 3054 df-rmo 3354 df-reu 3355 df-rab 3406 df-v 3449 df-sbc 3754 df-csb 3863 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-iun 4957 df-br 5108 df-opab 5170 df-mpt 5189 df-id 5533 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-res 5650 df-ima 5651 df-iota 6464 df-fun 6513 df-fn 6514 df-f 6515 df-f1 6516 df-fo 6517 df-f1o 6518 df-fv 6519 df-riota 7344 df-ov 7390 df-oprab 7391 df-proset 18255 df-poset 18274 df-lub 18305 df-glb 18306 df-join 18307 df-meet 18308 df-lat 18391

This theorem is referenced by: latjrot 18447 4noncolr3 39447 3atlem5 39481 lplnexllnN 39558 dalawlem11 39875 cdleme20bN 40304

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