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Theorem latleeqj2 18085

Description: "Less than or equal to" in terms of join. (chlejb2 29776 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 18084	. 2 ⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 ≤ 𝑌 ↔ (𝑋 ∨ 𝑌) = 𝑌))
5	1, 3	latjcom 18080	. . 3 ⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 ∨ 𝑌) = (𝑌 ∨ 𝑋))
6	5	eqeq1d 2740	. 2 ⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑋 ∨ 𝑌) = 𝑌 ↔ (𝑌 ∨ 𝑋) = 𝑌))
7	4, 6	bitrd 278	1 ⊢ ((𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 ≤ 𝑌 ↔ (𝑌 ∨ 𝑋) = 𝑌))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 class class class wbr 5070 ‘cfv 6418 (class class class)co 7255 Basecbs 16840 lecple 16895 joincjn 17944 Latclat 18064

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566

This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-ral 3068 df-rex 3069 df-reu 3070 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-id 5480 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-proset 17928 df-poset 17946 df-lub 17979 df-glb 17980 df-join 17981 df-meet 17982 df-lat 18065

This theorem is referenced by: latabs1 18108 cvrat4 37384 islpln2a 37489 2atmat 37502 lvolnle3at 37523 islvol2aN 37533 dalem39 37652 cdleme11 38211 cdleme30a 38319

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