meetat2 - Mathbox for Norm Megill

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Theorem meetat2 36448

Description: The meet of any element with an atom is either the atom or zero. (Contributed by NM, 30-Aug-2012.)

**Hypotheses**
Ref	Expression
m.b	⊢ 𝐵 = (Base‘𝐾)
m.m	⊢ ∧ = (meet‘𝐾)
m.z	⊢ 0 = (0.‘𝐾)
m.a	⊢ 𝐴 = (Atoms‘𝐾)

**Assertion**
Ref	Expression
meetat2	⊢ ((𝐾 ∈ OL ∧ 𝑋 ∈ 𝐵 ∧ 𝑃 ∈ 𝐴) → ((𝑋 ∧ 𝑃) ∈ 𝐴 ∨ (𝑋 ∧ 𝑃) = 0 ))

**Proof of Theorem meetat2**
Step	Hyp	Ref	Expression
1		m.b	. . 3 ⊢ 𝐵 = (Base‘𝐾)
2		m.m	. . 3 ⊢ ∧ = (meet‘𝐾)
3		m.z	. . 3 ⊢ 0 = (0.‘𝐾)
4		m.a	. . 3 ⊢ 𝐴 = (Atoms‘𝐾)
5	1, 2, 3, 4	meetat 36447	. 2 ⊢ ((𝐾 ∈ OL ∧ 𝑋 ∈ 𝐵 ∧ 𝑃 ∈ 𝐴) → ((𝑋 ∧ 𝑃) = 𝑃 ∨ (𝑋 ∧ 𝑃) = 0 ))
6		eleq1a 2908	. . . 4 ⊢ (𝑃 ∈ 𝐴 → ((𝑋 ∧ 𝑃) = 𝑃 → (𝑋 ∧ 𝑃) ∈ 𝐴))
7	6	3ad2ant3 1131	. . 3 ⊢ ((𝐾 ∈ OL ∧ 𝑋 ∈ 𝐵 ∧ 𝑃 ∈ 𝐴) → ((𝑋 ∧ 𝑃) = 𝑃 → (𝑋 ∧ 𝑃) ∈ 𝐴))
8	7	orim1d 962	. 2 ⊢ ((𝐾 ∈ OL ∧ 𝑋 ∈ 𝐵 ∧ 𝑃 ∈ 𝐴) → (((𝑋 ∧ 𝑃) = 𝑃 ∨ (𝑋 ∧ 𝑃) = 0 ) → ((𝑋 ∧ 𝑃) ∈ 𝐴 ∨ (𝑋 ∧ 𝑃) = 0 )))
9	5, 8	mpd 15	1 ⊢ ((𝐾 ∈ OL ∧ 𝑋 ∈ 𝐵 ∧ 𝑃 ∈ 𝐴) → ((𝑋 ∧ 𝑃) ∈ 𝐴 ∨ (𝑋 ∧ 𝑃) = 0 ))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∨ wo 843 ∧ w3a 1083 = wceq 1537 ∈ wcel 2114 ‘cfv 6355 (class class class)co 7156 Basecbs 16483 meetcmee 17555 0.cp0 17647 OLcol 36325 Atomscatm 36414

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 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-rep 5190 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4839 df-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-id 5460 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-riota 7114 df-ov 7159 df-oprab 7160 df-proset 17538 df-poset 17556 df-plt 17568 df-lub 17584 df-glb 17585 df-join 17586 df-meet 17587 df-p0 17649 df-lat 17656 df-oposet 36327 df-ol 36329 df-covers 36417 df-ats 36418

This theorem is referenced by: 2at0mat0 36676 atmod1i1m 37009

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