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Description: Part of proof of Lemma E in Crawley p. 113, 4th paragraph, 6th line on p. 115. (Contributed by NM, 8-Dec-2012)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | cdleme23.b | ⊢ 𝐵 = ( Base ‘ 𝐾 ) | |
| cdleme23.l | ⊢ ≤ = ( le ‘ 𝐾 ) | ||
| cdleme23.j | ⊢ ∨ = ( join ‘ 𝐾 ) | ||
| cdleme23.m | ⊢ ∧ = ( meet ‘ 𝐾 ) | ||
| cdleme23.a | ⊢ 𝐴 = ( Atoms ‘ 𝐾 ) | ||
| cdleme23.h | ⊢ 𝐻 = ( LHyp ‘ 𝐾 ) | ||
| cdleme23.v | ⊢ 𝑉 = ( ( 𝑆 ∨ 𝑇 ) ∧ ( 𝑋 ∧ 𝑊 ) ) | ||
| Assertion | cdleme23c | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑆 ≤ ( 𝑇 ∨ 𝑉 ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cdleme23.b | ⊢ 𝐵 = ( Base ‘ 𝐾 ) | |
| 2 | cdleme23.l | ⊢ ≤ = ( le ‘ 𝐾 ) | |
| 3 | cdleme23.j | ⊢ ∨ = ( join ‘ 𝐾 ) | |
| 4 | cdleme23.m | ⊢ ∧ = ( meet ‘ 𝐾 ) | |
| 5 | cdleme23.a | ⊢ 𝐴 = ( Atoms ‘ 𝐾 ) | |
| 6 | cdleme23.h | ⊢ 𝐻 = ( LHyp ‘ 𝐾 ) | |
| 7 | cdleme23.v | ⊢ 𝑉 = ( ( 𝑆 ∨ 𝑇 ) ∧ ( 𝑋 ∧ 𝑊 ) ) | |
| 8 | simp11l | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝐾 ∈ HL ) | |
| 9 | 8 | hllatd | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝐾 ∈ Lat ) |
| 10 | simp12l | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑆 ∈ 𝐴 ) | |
| 11 | 1 5 | atbase | ⊢ ( 𝑆 ∈ 𝐴 → 𝑆 ∈ 𝐵 ) |
| 12 | 10 11 | syl | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑆 ∈ 𝐵 ) |
| 13 | simp13l | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑇 ∈ 𝐴 ) | |
| 14 | 1 5 | atbase | ⊢ ( 𝑇 ∈ 𝐴 → 𝑇 ∈ 𝐵 ) |
| 15 | 13 14 | syl | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑇 ∈ 𝐵 ) |
| 16 | 1 2 3 | latlej1 | ⊢ ( ( 𝐾 ∈ Lat ∧ 𝑆 ∈ 𝐵 ∧ 𝑇 ∈ 𝐵 ) → 𝑆 ≤ ( 𝑆 ∨ 𝑇 ) ) |
| 17 | 9 12 15 16 | syl3anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑆 ≤ ( 𝑆 ∨ 𝑇 ) ) |
| 18 | simp2l | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑋 ∈ 𝐵 ) | |
| 19 | simp11r | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑊 ∈ 𝐻 ) | |
| 20 | 1 6 | lhpbase | ⊢ ( 𝑊 ∈ 𝐻 → 𝑊 ∈ 𝐵 ) |
| 21 | 19 20 | syl | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑊 ∈ 𝐵 ) |
| 22 | 1 4 | latmcl | ⊢ ( ( 𝐾 ∈ Lat ∧ 𝑋 ∈ 𝐵 ∧ 𝑊 ∈ 𝐵 ) → ( 𝑋 ∧ 𝑊 ) ∈ 𝐵 ) |
| 23 | 9 18 21 22 | syl3anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → ( 𝑋 ∧ 𝑊 ) ∈ 𝐵 ) |
| 24 | 1 2 3 | latlej1 | ⊢ ( ( 𝐾 ∈ Lat ∧ 𝑆 ∈ 𝐵 ∧ ( 𝑋 ∧ 𝑊 ) ∈ 𝐵 ) → 𝑆 ≤ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) ) |
| 25 | 9 12 23 24 | syl3anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑆 ≤ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) ) |
| 26 | simp32 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) | |
| 27 | simp33 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) | |
| 28 | 26 27 | eqtr4d | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ) |
| 29 | 25 28 | breqtrd | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑆 ≤ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ) |
| 30 | 1 3 5 | hlatjcl | ⊢ ( ( 𝐾 ∈ HL ∧ 𝑆 ∈ 𝐴 ∧ 𝑇 ∈ 𝐴 ) → ( 𝑆 ∨ 𝑇 ) ∈ 𝐵 ) |
| 31 | 8 10 13 30 | syl3anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → ( 𝑆 ∨ 𝑇 ) ∈ 𝐵 ) |
| 32 | 1 3 | latjcl | ⊢ ( ( 𝐾 ∈ Lat ∧ 𝑇 ∈ 𝐵 ∧ ( 𝑋 ∧ 𝑊 ) ∈ 𝐵 ) → ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ∈ 𝐵 ) |
| 33 | 9 15 23 32 | syl3anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ∈ 𝐵 ) |
| 34 | 1 2 4 | latlem12 | ⊢ ( ( 𝐾 ∈ Lat ∧ ( 𝑆 ∈ 𝐵 ∧ ( 𝑆 ∨ 𝑇 ) ∈ 𝐵 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ∈ 𝐵 ) ) → ( ( 𝑆 ≤ ( 𝑆 ∨ 𝑇 ) ∧ 𝑆 ≤ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ) ↔ 𝑆 ≤ ( ( 𝑆 ∨ 𝑇 ) ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ) ) ) |
| 35 | 9 12 31 33 34 | syl13anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → ( ( 𝑆 ≤ ( 𝑆 ∨ 𝑇 ) ∧ 𝑆 ≤ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ) ↔ 𝑆 ≤ ( ( 𝑆 ∨ 𝑇 ) ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ) ) ) |
| 36 | 17 29 35 | mpbi2and | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑆 ≤ ( ( 𝑆 ∨ 𝑇 ) ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ) ) |
| 37 | 7 | oveq2i | ⊢ ( 𝑇 ∨ 𝑉 ) = ( 𝑇 ∨ ( ( 𝑆 ∨ 𝑇 ) ∧ ( 𝑋 ∧ 𝑊 ) ) ) |
| 38 | 1 2 3 | latlej2 | ⊢ ( ( 𝐾 ∈ Lat ∧ 𝑆 ∈ 𝐵 ∧ 𝑇 ∈ 𝐵 ) → 𝑇 ≤ ( 𝑆 ∨ 𝑇 ) ) |
| 39 | 9 12 15 38 | syl3anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑇 ≤ ( 𝑆 ∨ 𝑇 ) ) |
| 40 | 1 2 3 4 5 | atmod3i1 | ⊢ ( ( 𝐾 ∈ HL ∧ ( 𝑇 ∈ 𝐴 ∧ ( 𝑆 ∨ 𝑇 ) ∈ 𝐵 ∧ ( 𝑋 ∧ 𝑊 ) ∈ 𝐵 ) ∧ 𝑇 ≤ ( 𝑆 ∨ 𝑇 ) ) → ( 𝑇 ∨ ( ( 𝑆 ∨ 𝑇 ) ∧ ( 𝑋 ∧ 𝑊 ) ) ) = ( ( 𝑆 ∨ 𝑇 ) ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ) ) |
| 41 | 8 13 31 23 39 40 | syl131anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → ( 𝑇 ∨ ( ( 𝑆 ∨ 𝑇 ) ∧ ( 𝑋 ∧ 𝑊 ) ) ) = ( ( 𝑆 ∨ 𝑇 ) ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ) ) |
| 42 | 37 41 | eqtrid | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → ( 𝑇 ∨ 𝑉 ) = ( ( 𝑆 ∨ 𝑇 ) ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) ) ) |
| 43 | 36 42 | breqtrrd | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑊 ∈ 𝐻 ) ∧ ( 𝑆 ∈ 𝐴 ∧ ¬ 𝑆 ≤ 𝑊 ) ∧ ( 𝑇 ∈ 𝐴 ∧ ¬ 𝑇 ≤ 𝑊 ) ) ∧ ( 𝑋 ∈ 𝐵 ∧ ¬ 𝑋 ≤ 𝑊 ) ∧ ( 𝑆 ≠ 𝑇 ∧ ( 𝑆 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ∧ ( 𝑇 ∨ ( 𝑋 ∧ 𝑊 ) ) = 𝑋 ) ) → 𝑆 ≤ ( 𝑇 ∨ 𝑉 ) ) |