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Metamath Proof Explorer

Theorem cdleme43fsv1sn

Description: Value of [_ R / s ]_ N when R .<_ ( P .\/ Q ) . (Contributed by NM, 30-Mar-2013)

Ref Expression
Hypotheses cdlemefs32.b ⊢ 𝐵 = ( Base ‘ 𝐾 )
cdlemefs32.l ⊢ ≤ = ( le ‘ 𝐾 )
cdlemefs32.j ⊢ ∨ = ( join ‘ 𝐾 )
cdlemefs32.m ⊢ ∧ = ( meet ‘ 𝐾 )
cdlemefs32.a ⊢ 𝐴 = ( Atoms ‘ 𝐾 )
cdlemefs32.h ⊢ 𝐻 = ( LHyp ‘ 𝐾 )
cdlemefs32.u ⊢ 𝑈 = ( ( 𝑃 ∨ 𝑄 ) ∧ 𝑊 )
cdlemefs32.d ⊢ 𝐷 = ( ( 𝑡 ∨ 𝑈 ) ∧ ( 𝑄 ∨ ( ( 𝑃 ∨ 𝑡 ) ∧ 𝑊 ) ) )
cdlemefs32.e ⊢ 𝐸 = ( ( 𝑃 ∨ 𝑄 ) ∧ ( 𝐷 ∨ ( ( 𝑠 ∨ 𝑡 ) ∧ 𝑊 ) ) )
cdlemefs32.i ⊢ 𝐼 = ( ℩ 𝑦 ∈ 𝐵 ∀ 𝑡 ∈ 𝐴 ( ( ¬ 𝑡 ≤ 𝑊 ∧ ¬ 𝑡 ≤ ( 𝑃 ∨ 𝑄 ) ) → 𝑦 = 𝐸 ) )
cdlemefs32.n ⊢ 𝑁 = if ( 𝑠 ≤ ( 𝑃 ∨ 𝑄 ) , 𝐼 , 𝐶 )
cdleme43fs.y ⊢ 𝑌 = ( ( 𝑆 ∨ 𝑈 ) ∧ ( 𝑄 ∨ ( ( 𝑃 ∨ 𝑆 ) ∧ 𝑊 ) ) )
cdleme43fs.z ⊢ 𝑍 = ( ( 𝑃 ∨ 𝑄 ) ∧ ( 𝑌 ∨ ( ( 𝑅 ∨ 𝑆 ) ∧ 𝑊 ) ) )
Assertion cdleme43fsv1sn ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑃 ∈ 𝐴 ∧ ¬ 𝑃 ≤ 𝑊 ) ∧ ( 𝑄 ∈ 𝐴 ∧ ¬ 𝑄 ≤ 𝑊 ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ( 𝑅 ∈ 𝐴 ∧ ¬ 𝑅 ≤ 𝑊 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ) ∧ ( 𝑅 ≤ ( 𝑃 ∨ 𝑄 ) ∧ ¬ 𝑆 ≤ ( 𝑃 ∨ 𝑄 ) ) ) → ⦋ 𝑅 / 𝑠 ⦌ 𝑁 = 𝑍 )

Proof

Step Hyp Ref Expression
1 cdlemefs32.b ⊢ 𝐵 = ( Base ‘ 𝐾 )
2 cdlemefs32.l ⊢ ≤ = ( le ‘ 𝐾 )
3 cdlemefs32.j ⊢ ∨ = ( join ‘ 𝐾 )
4 cdlemefs32.m ⊢ ∧ = ( meet ‘ 𝐾 )
5 cdlemefs32.a ⊢ 𝐴 = ( Atoms ‘ 𝐾 )
6 cdlemefs32.h ⊢ 𝐻 = ( LHyp ‘ 𝐾 )
7 cdlemefs32.u ⊢ 𝑈 = ( ( 𝑃 ∨ 𝑄 ) ∧ 𝑊 )
8 cdlemefs32.d ⊢ 𝐷 = ( ( 𝑡 ∨ 𝑈 ) ∧ ( 𝑄 ∨ ( ( 𝑃 ∨ 𝑡 ) ∧ 𝑊 ) ) )
9 cdlemefs32.e ⊢ 𝐸 = ( ( 𝑃 ∨ 𝑄 ) ∧ ( 𝐷 ∨ ( ( 𝑠 ∨ 𝑡 ) ∧ 𝑊 ) ) )
10 cdlemefs32.i ⊢ 𝐼 = ( ℩ 𝑦 ∈ 𝐵 ∀ 𝑡 ∈ 𝐴 ( ( ¬ 𝑡 ≤ 𝑊 ∧ ¬ 𝑡 ≤ ( 𝑃 ∨ 𝑄 ) ) → 𝑦 = 𝐸 ) )
11 cdlemefs32.n ⊢ 𝑁 = if ( 𝑠 ≤ ( 𝑃 ∨ 𝑄 ) , 𝐼 , 𝐶 )
12 cdleme43fs.y ⊢ 𝑌 = ( ( 𝑆 ∨ 𝑈 ) ∧ ( 𝑄 ∨ ( ( 𝑃 ∨ 𝑆 ) ∧ 𝑊 ) ) )
13 cdleme43fs.z ⊢ 𝑍 = ( ( 𝑃 ∨ 𝑄 ) ∧ ( 𝑌 ∨ ( ( 𝑅 ∨ 𝑆 ) ∧ 𝑊 ) ) )
14 eqid ⊢ ( ( 𝑃 ∨ 𝑄 ) ∧ ( 𝐷 ∨ ( ( 𝑅 ∨ 𝑡 ) ∧ 𝑊 ) ) ) = ( ( 𝑃 ∨ 𝑄 ) ∧ ( 𝐷 ∨ ( ( 𝑅 ∨ 𝑡 ) ∧ 𝑊 ) ) )
15 eqid ⊢ ( ℩ 𝑦 ∈ 𝐵 ∀ 𝑡 ∈ 𝐴 ( ( ¬ 𝑡 ≤ 𝑊 ∧ ¬ 𝑡 ≤ ( 𝑃 ∨ 𝑄 ) ) → 𝑦 = ( ( 𝑃 ∨ 𝑄 ) ∧ ( 𝐷 ∨ ( ( 𝑅 ∨ 𝑡 ) ∧ 𝑊 ) ) ) ) ) = ( ℩ 𝑦 ∈ 𝐵 ∀ 𝑡 ∈ 𝐴 ( ( ¬ 𝑡 ≤ 𝑊 ∧ ¬ 𝑡 ≤ ( 𝑃 ∨ 𝑄 ) ) → 𝑦 = ( ( 𝑃 ∨ 𝑄 ) ∧ ( 𝐷 ∨ ( ( 𝑅 ∨ 𝑡 ) ∧ 𝑊 ) ) ) ) )
16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 cdleme43fsv1snlem ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑃 ∈ 𝐴 ∧ ¬ 𝑃 ≤ 𝑊 ) ∧ ( 𝑄 ∈ 𝐴 ∧ ¬ 𝑄 ≤ 𝑊 ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ( 𝑅 ∈ 𝐴 ∧ ¬ 𝑅 ≤ 𝑊 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ) ∧ ( 𝑅 ≤ ( 𝑃 ∨ 𝑄 ) ∧ ¬ 𝑆 ≤ ( 𝑃 ∨ 𝑄 ) ) ) → ⦋ 𝑅 / 𝑠 ⦌ 𝑁 = 𝑍 )