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Description: Lemma for 3dim1 . (Contributed by NM, 25-Jul-2012) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | 3dim0.j | ⊢ ∨ = ( join ‘ 𝐾 ) | |
| 3dim0.l | ⊢ ≤ = ( le ‘ 𝐾 ) | ||
| 3dim0.a | ⊢ 𝐴 = ( Atoms ‘ 𝐾 ) | ||
| Assertion | 3dimlem3OLDN | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑅 ≤ ( 𝑃 ∨ 𝑄 ) ∧ ¬ 𝑇 ≤ ( ( 𝑃 ∨ 𝑄 ) ∨ 𝑅 ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 3dim0.j | ⊢ ∨ = ( join ‘ 𝐾 ) | |
| 2 | 3dim0.l | ⊢ ≤ = ( le ‘ 𝐾 ) | |
| 3 | 3dim0.a | ⊢ 𝐴 = ( Atoms ‘ 𝐾 ) | |
| 4 | simpr1 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝑃 ≠ 𝑄 ) | |
| 5 | simpr2 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ) | |
| 6 | simpl11 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝐾 ∈ HL ) | |
| 7 | simpl2l | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝑅 ∈ 𝐴 ) | |
| 8 | simpl12 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝑃 ∈ 𝐴 ) | |
| 9 | simpl13 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝑄 ∈ 𝐴 ) | |
| 10 | simpl3l | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝑄 ≠ 𝑅 ) | |
| 11 | 10 | necomd | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝑅 ≠ 𝑄 ) |
| 12 | 2 1 3 | hlatexch2 | ⊢ ( ( 𝐾 ∈ HL ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ 𝑅 ≠ 𝑄 ) → ( 𝑅 ≤ ( 𝑃 ∨ 𝑄 ) → 𝑃 ≤ ( 𝑅 ∨ 𝑄 ) ) ) |
| 13 | 6 7 8 9 11 12 | syl131anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( 𝑅 ≤ ( 𝑃 ∨ 𝑄 ) → 𝑃 ≤ ( 𝑅 ∨ 𝑄 ) ) ) |
| 14 | 1 3 | hlatjcom | ⊢ ( ( 𝐾 ∈ HL ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴 ) → ( 𝑄 ∨ 𝑅 ) = ( 𝑅 ∨ 𝑄 ) ) |
| 15 | 6 9 7 14 | syl3anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( 𝑄 ∨ 𝑅 ) = ( 𝑅 ∨ 𝑄 ) ) |
| 16 | 15 | breq2d | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ↔ 𝑃 ≤ ( 𝑅 ∨ 𝑄 ) ) ) |
| 17 | 13 16 | sylibrd | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( 𝑅 ≤ ( 𝑃 ∨ 𝑄 ) → 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ) ) |
| 18 | 5 17 | mtod | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ¬ 𝑅 ≤ ( 𝑃 ∨ 𝑄 ) ) |
| 19 | simpl3r | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) | |
| 20 | hllat | ⊢ ( 𝐾 ∈ HL → 𝐾 ∈ Lat ) | |
| 21 | 6 20 | syl | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝐾 ∈ Lat ) |
| 22 | eqid | ⊢ ( Base ‘ 𝐾 ) = ( Base ‘ 𝐾 ) | |
| 23 | 22 3 | atbase | ⊢ ( 𝑄 ∈ 𝐴 → 𝑄 ∈ ( Base ‘ 𝐾 ) ) |
| 24 | 9 23 | syl | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝑄 ∈ ( Base ‘ 𝐾 ) ) |
| 25 | 22 3 | atbase | ⊢ ( 𝑅 ∈ 𝐴 → 𝑅 ∈ ( Base ‘ 𝐾 ) ) |
| 26 | 7 25 | syl | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝑅 ∈ ( Base ‘ 𝐾 ) ) |
| 27 | 22 3 | atbase | ⊢ ( 𝑃 ∈ 𝐴 → 𝑃 ∈ ( Base ‘ 𝐾 ) ) |
| 28 | 8 27 | syl | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝑃 ∈ ( Base ‘ 𝐾 ) ) |
| 29 | 22 1 | latjrot | ⊢ ( ( 𝐾 ∈ Lat ∧ ( 𝑄 ∈ ( Base ‘ 𝐾 ) ∧ 𝑅 ∈ ( Base ‘ 𝐾 ) ∧ 𝑃 ∈ ( Base ‘ 𝐾 ) ) ) → ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑃 ) = ( ( 𝑃 ∨ 𝑄 ) ∨ 𝑅 ) ) |
| 30 | 21 24 26 28 29 | syl13anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑃 ) = ( ( 𝑃 ∨ 𝑄 ) ∨ 𝑅 ) ) |
| 31 | simpr3 | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) | |
| 32 | simpl2r | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → 𝑆 ∈ 𝐴 ) | |
| 33 | 22 1 3 | hlatjcl | ⊢ ( ( 𝐾 ∈ HL ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴 ) → ( 𝑄 ∨ 𝑅 ) ∈ ( Base ‘ 𝐾 ) ) |
| 34 | 6 9 7 33 | syl3anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( 𝑄 ∨ 𝑅 ) ∈ ( Base ‘ 𝐾 ) ) |
| 35 | 22 2 1 3 | hlexchb1 | ⊢ ( ( 𝐾 ∈ HL ∧ ( 𝑃 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ∧ ( 𝑄 ∨ 𝑅 ) ∈ ( Base ‘ 𝐾 ) ) ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ) → ( 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ↔ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑃 ) = ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) |
| 36 | 6 8 32 34 5 35 | syl131anc | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ↔ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑃 ) = ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) |
| 37 | 31 36 | mpbid | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑃 ) = ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) |
| 38 | 30 37 | eqtr3d | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( ( 𝑃 ∨ 𝑄 ) ∨ 𝑅 ) = ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) |
| 39 | 38 | breq2d | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( 𝑇 ≤ ( ( 𝑃 ∨ 𝑄 ) ∨ 𝑅 ) ↔ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) |
| 40 | 19 39 | mtbird | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ¬ 𝑇 ≤ ( ( 𝑃 ∨ 𝑄 ) ∨ 𝑅 ) ) |
| 41 | 4 18 40 | 3jca | ⊢ ( ( ( ( 𝐾 ∈ HL ∧ 𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ) ∧ ( 𝑅 ∈ 𝐴 ∧ 𝑆 ∈ 𝐴 ) ∧ ( 𝑄 ≠ 𝑅 ∧ ¬ 𝑇 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) ∧ ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑃 ≤ ( 𝑄 ∨ 𝑅 ) ∧ 𝑃 ≤ ( ( 𝑄 ∨ 𝑅 ) ∨ 𝑆 ) ) ) → ( 𝑃 ≠ 𝑄 ∧ ¬ 𝑅 ≤ ( 𝑃 ∨ 𝑄 ) ∧ ¬ 𝑇 ≤ ( ( 𝑃 ∨ 𝑄 ) ∨ 𝑅 ) ) ) |