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Theorem latj31 18412

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 1198	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → 𝑍 ∈ 𝐵)
3		simpr1 1196	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → 𝑋 ∈ 𝐵)
4		simpr2 1197	. . 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 18409	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑍 ∈ 𝐵 ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵)) → (𝑍 ∨ (𝑋 ∨ 𝑌)) = (𝑋 ∨ (𝑍 ∨ 𝑌)))
8	1, 2, 3, 4, 7	syl13anc 1375	. 2 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (𝑍 ∨ (𝑋 ∨ 𝑌)) = (𝑋 ∨ (𝑍 ∨ 𝑌)))
9	5, 6	latjcl 18364	. . . 4 ⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 ∨ 𝑌) ∈ 𝐵)
10	9	3adant3r3 1186	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (𝑋 ∨ 𝑌) ∈ 𝐵)
11	5, 6	latjcom 18372	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∨ 𝑌) ∈ 𝐵 ∧ 𝑍 ∈ 𝐵) → ((𝑋 ∨ 𝑌) ∨ 𝑍) = (𝑍 ∨ (𝑋 ∨ 𝑌)))
12	1, 10, 2, 11	syl3anc 1374	. 2 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑋 ∨ 𝑌) ∨ 𝑍) = (𝑍 ∨ (𝑋 ∨ 𝑌)))
13	5, 6	latjcl 18364	. . . 4 ⊢ ((𝐾 ∈ Lat ∧ 𝑍 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑍 ∨ 𝑌) ∈ 𝐵)
14	1, 2, 4, 13	syl3anc 1374	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → (𝑍 ∨ 𝑌) ∈ 𝐵)
15	5, 6	latjcom 18372	. . 3 ⊢ ((𝐾 ∈ Lat ∧ (𝑍 ∨ 𝑌) ∈ 𝐵 ∧ 𝑋 ∈ 𝐵) → ((𝑍 ∨ 𝑌) ∨ 𝑋) = (𝑋 ∨ (𝑍 ∨ 𝑌)))
16	1, 14, 3, 15	syl3anc 1374	. 2 ⊢ ((𝐾 ∈ Lat ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ 𝑍 ∈ 𝐵)) → ((𝑍 ∨ 𝑌) ∨ 𝑋) = (𝑋 ∨ (𝑍 ∨ 𝑌)))
17	8, 12, 16	3eqtr4d 2780	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 1087 = wceq 1542 ∈ wcel 2114 ‘cfv 6491 (class class class)co 7358 Basecbs 17138 joincjn 18236 Latclat 18356

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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2183 ax-ext 2707 ax-rep 5223 ax-sep 5240 ax-nul 5250 ax-pow 5309 ax-pr 5376 ax-un 7680

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2538 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2810 df-nfc 2884 df-ne 2932 df-ral 3051 df-rex 3060 df-rmo 3349 df-reu 3350 df-rab 3399 df-v 3441 df-sbc 3740 df-csb 3849 df-dif 3903 df-un 3905 df-in 3907 df-ss 3917 df-nul 4285 df-if 4479 df-pw 4555 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-iun 4947 df-br 5098 df-opab 5160 df-mpt 5179 df-id 5518 df-xp 5629 df-rel 5630 df-cnv 5631 df-co 5632 df-dm 5633 df-rn 5634 df-res 5635 df-ima 5636 df-iota 6447 df-fun 6493 df-fn 6494 df-f 6495 df-f1 6496 df-fo 6497 df-f1o 6498 df-fv 6499 df-riota 7315 df-ov 7361 df-oprab 7362 df-proset 18219 df-poset 18238 df-lub 18269 df-glb 18270 df-join 18271 df-meet 18272 df-lat 18357

This theorem is referenced by: latjrot 18413 4noncolr3 39748 3atlem5 39782 lplnexllnN 39859 dalawlem11 40176 cdleme20bN 40605

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