4atlem4c - Mathbox for Norm Megill

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Theorem 4atlem4c 39706

Description: Lemma for 4at 39718. Frequently used associative law. (Contributed by NM, 9-Jul-2012.)

**Hypotheses**
Ref	Expression
4at.l	⊢ ≤ = (le‘𝐾)
4at.j	⊢ ∨ = (join‘𝐾)
4at.a	⊢ 𝐴 = (Atoms‘𝐾)

**Assertion**
Ref	Expression
4atlem4c	⊢ (((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ∨ 𝑄) ∨ (𝑅 ∨ 𝑆)) = (𝑅 ∨ ((𝑃 ∨ 𝑄) ∨ 𝑆)))

**Proof of Theorem 4atlem4c**
Step	Hyp	Ref	Expression
1		simpl1 1192	. . 3 ⊢ (((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝐾 ∈ HL)
2	1	hllatd 39469	. 2 ⊢ (((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝐾 ∈ Lat)
3		eqid 2731	. . . 4 ⊢ (Base‘𝐾) = (Base‘𝐾)
4		4at.j	. . . 4 ⊢ ∨ = (join‘𝐾)
5		4at.a	. . . 4 ⊢ 𝐴 = (Atoms‘𝐾)
6	3, 4, 5	hlatjcl 39472	. . 3 ⊢ ((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴) → (𝑃 ∨ 𝑄) ∈ (Base‘𝐾))
7	6	adantr 480	. 2 ⊢ (((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → (𝑃 ∨ 𝑄) ∈ (Base‘𝐾))
8	3, 5	atbase 39394	. . 3 ⊢ (𝑅 ∈ 𝐴 → 𝑅 ∈ (Base‘𝐾))
9	8	ad2antrl 728	. 2 ⊢ (((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝑅 ∈ (Base‘𝐾))
10	3, 5	atbase 39394	. . 3 ⊢ (𝑆 ∈ 𝐴 → 𝑆 ∈ (Base‘𝐾))
11	10	ad2antll 729	. 2 ⊢ (((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → 𝑆 ∈ (Base‘𝐾))
12	3, 4	latj12 18396	. 2 ⊢ ((𝐾 ∈ Lat ∧ ((𝑃 ∨ 𝑄) ∈ (Base‘𝐾) ∧ 𝑅 ∈ (Base‘𝐾) ∧ 𝑆 ∈ (Base‘𝐾))) → ((𝑃 ∨ 𝑄) ∨ (𝑅 ∨ 𝑆)) = (𝑅 ∨ ((𝑃 ∨ 𝑄) ∨ 𝑆)))
13	2, 7, 9, 11, 12	syl13anc 1374	1 ⊢ (((𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴) ∧ (𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴)) → ((𝑃 ∨ 𝑄) ∨ (𝑅 ∨ 𝑆)) = (𝑅 ∨ ((𝑃 ∨ 𝑄) ∨ 𝑆)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1086 = wceq 1541 ∈ wcel 2111 ‘cfv 6487 (class class class)co 7352 Basecbs 17126 lecple 17174 joincjn 18223 Latclat 18343 Atomscatm 39368 HLchlt 39455

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-rep 5219 ax-sep 5236 ax-nul 5246 ax-pow 5305 ax-pr 5372 ax-un 7674

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-nul 4283 df-if 4475 df-pw 4551 df-sn 4576 df-pr 4578 df-op 4582 df-uni 4859 df-iun 4943 df-br 5094 df-opab 5156 df-mpt 5175 df-id 5514 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 df-iota 6443 df-fun 6489 df-fn 6490 df-f 6491 df-f1 6492 df-fo 6493 df-f1o 6494 df-fv 6495 df-riota 7309 df-ov 7355 df-oprab 7356 df-proset 18206 df-poset 18225 df-lub 18256 df-glb 18257 df-join 18258 df-meet 18259 df-lat 18344 df-ats 39372 df-atl 39403 df-cvlat 39427 df-hlat 39456

This theorem is referenced by: 4atlem10a 39709

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