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Theorem latleeqj2 18467

Description: "Less than or equal to" in terms of join. (chlejb2 31499 analog.) (Contributed by NM, 14-Nov-2011.)

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

**Assertion**
Ref	Expression
latleeqj2	⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 ≤ 𝑌 ↔ (𝑌 ∨ 𝑋) = 𝑌))

**Proof of Theorem latleeqj2**
Step	Hyp	Ref	Expression
1		latlej.b	. . 3 ⊢ 𝐵 = (Base‘𝐾)
2		latlej.l	. . 3 ⊢ ≤ = (le‘𝐾)
3		latlej.j	. . 3 ⊢ ∨ = (join‘𝐾)
4	1, 2, 3	latleeqj1 18466	. 2 ⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 ≤ 𝑌 ↔ (𝑋 ∨ 𝑌) = 𝑌))
5	1, 3	latjcom 18462	. . 3 ⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 ∨ 𝑌) = (𝑌 ∨ 𝑋))
6	5	eqeq1d 2738	. 2 ⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑋 ∨ 𝑌) = 𝑌 ↔ (𝑌 ∨ 𝑋) = 𝑌))
7	4, 6	bitrd 279	1 ⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 ≤ 𝑌 ↔ (𝑌 ∨ 𝑋) = 𝑌))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ w3a 1086 = wceq 1540 ∈ wcel 2109 class class class wbr 5124 ‘cfv 6536 (class class class)co 7410 Basecbs 17233 lecple 17283 joincjn 18328 Latclat 18446

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 2708 ax-rep 5254 ax-sep 5271 ax-nul 5281 ax-pow 5340 ax-pr 5407 ax-un 7734

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 2540 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2810 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3062 df-rmo 3364 df-reu 3365 df-rab 3421 df-v 3466 df-sbc 3771 df-csb 3880 df-dif 3934 df-un 3936 df-in 3938 df-ss 3948 df-nul 4314 df-if 4506 df-pw 4582 df-sn 4607 df-pr 4609 df-op 4613 df-uni 4889 df-iun 4974 df-br 5125 df-opab 5187 df-mpt 5207 df-id 5553 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-iota 6489 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7367 df-ov 7413 df-oprab 7414 df-proset 18311 df-poset 18330 df-lub 18361 df-glb 18362 df-join 18363 df-meet 18364 df-lat 18447

This theorem is referenced by: latabs1 18490 cvrat4 39467 islpln2a 39572 2atmat 39585 lvolnle3at 39606 islvol2aN 39616 dalem39 39735 cdleme11 40294 cdleme30a 40402

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