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Description: A lattice element that commutes with two others also commutes with their join. Theorem 4.2 of Beran p. 49. (Contributed by NM, 15-Jun-2006) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | cm2j | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → 𝐴 𝐶ℋ ( 𝐵 ∨ℋ 𝐶 ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cmcm | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( 𝐴 𝐶ℋ 𝐵 ↔ 𝐵 𝐶ℋ 𝐴 ) ) | |
| 2 | cmbr | ⊢ ( ( 𝐵 ∈ Cℋ ∧ 𝐴 ∈ Cℋ ) → ( 𝐵 𝐶ℋ 𝐴 ↔ 𝐵 = ( ( 𝐵 ∩ 𝐴 ) ∨ℋ ( 𝐵 ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) | |
| 3 | 2 | ancoms | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( 𝐵 𝐶ℋ 𝐴 ↔ 𝐵 = ( ( 𝐵 ∩ 𝐴 ) ∨ℋ ( 𝐵 ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) |
| 4 | 1 3 | bitrd | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( 𝐴 𝐶ℋ 𝐵 ↔ 𝐵 = ( ( 𝐵 ∩ 𝐴 ) ∨ℋ ( 𝐵 ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) |
| 5 | 4 | biimpa | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) ∧ 𝐴 𝐶ℋ 𝐵 ) → 𝐵 = ( ( 𝐵 ∩ 𝐴 ) ∨ℋ ( 𝐵 ∩ ( ⊥ ‘ 𝐴 ) ) ) ) |
| 6 | incom | ⊢ ( 𝐵 ∩ 𝐴 ) = ( 𝐴 ∩ 𝐵 ) | |
| 7 | incom | ⊢ ( 𝐵 ∩ ( ⊥ ‘ 𝐴 ) ) = ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) | |
| 8 | 6 7 | oveq12i | ⊢ ( ( 𝐵 ∩ 𝐴 ) ∨ℋ ( 𝐵 ∩ ( ⊥ ‘ 𝐴 ) ) ) = ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ) |
| 9 | 5 8 | eqtrdi | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) ∧ 𝐴 𝐶ℋ 𝐵 ) → 𝐵 = ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ) ) |
| 10 | 9 | 3adantl3 | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ 𝐴 𝐶ℋ 𝐵 ) → 𝐵 = ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ) ) |
| 11 | 10 | adantrr | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → 𝐵 = ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ) ) |
| 12 | cmcm | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( 𝐴 𝐶ℋ 𝐶 ↔ 𝐶 𝐶ℋ 𝐴 ) ) | |
| 13 | cmbr | ⊢ ( ( 𝐶 ∈ Cℋ ∧ 𝐴 ∈ Cℋ ) → ( 𝐶 𝐶ℋ 𝐴 ↔ 𝐶 = ( ( 𝐶 ∩ 𝐴 ) ∨ℋ ( 𝐶 ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) | |
| 14 | 13 | ancoms | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( 𝐶 𝐶ℋ 𝐴 ↔ 𝐶 = ( ( 𝐶 ∩ 𝐴 ) ∨ℋ ( 𝐶 ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) |
| 15 | 12 14 | bitrd | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( 𝐴 𝐶ℋ 𝐶 ↔ 𝐶 = ( ( 𝐶 ∩ 𝐴 ) ∨ℋ ( 𝐶 ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) |
| 16 | 15 | biimpa | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ 𝐴 𝐶ℋ 𝐶 ) → 𝐶 = ( ( 𝐶 ∩ 𝐴 ) ∨ℋ ( 𝐶 ∩ ( ⊥ ‘ 𝐴 ) ) ) ) |
| 17 | incom | ⊢ ( 𝐶 ∩ 𝐴 ) = ( 𝐴 ∩ 𝐶 ) | |
| 18 | incom | ⊢ ( 𝐶 ∩ ( ⊥ ‘ 𝐴 ) ) = ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) | |
| 19 | 17 18 | oveq12i | ⊢ ( ( 𝐶 ∩ 𝐴 ) ∨ℋ ( 𝐶 ∩ ( ⊥ ‘ 𝐴 ) ) ) = ( ( 𝐴 ∩ 𝐶 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) |
| 20 | 16 19 | eqtrdi | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ 𝐴 𝐶ℋ 𝐶 ) → 𝐶 = ( ( 𝐴 ∩ 𝐶 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) |
| 21 | 20 | 3adantl2 | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ 𝐴 𝐶ℋ 𝐶 ) → 𝐶 = ( ( 𝐴 ∩ 𝐶 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) |
| 22 | 21 | adantrl | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → 𝐶 = ( ( 𝐴 ∩ 𝐶 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) |
| 23 | 11 22 | oveq12d | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → ( 𝐵 ∨ℋ 𝐶 ) = ( ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ) ∨ℋ ( ( 𝐴 ∩ 𝐶 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) ) |
| 24 | chincl | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( 𝐴 ∩ 𝐵 ) ∈ Cℋ ) | |
| 25 | choccl | ⊢ ( 𝐴 ∈ Cℋ → ( ⊥ ‘ 𝐴 ) ∈ Cℋ ) | |
| 26 | chincl | ⊢ ( ( ( ⊥ ‘ 𝐴 ) ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∈ Cℋ ) | |
| 27 | 25 26 | sylan | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∈ Cℋ ) |
| 28 | 24 27 | jca | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( ( 𝐴 ∩ 𝐵 ) ∈ Cℋ ∧ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∈ Cℋ ) ) |
| 29 | chincl | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( 𝐴 ∩ 𝐶 ) ∈ Cℋ ) | |
| 30 | chincl | ⊢ ( ( ( ⊥ ‘ 𝐴 ) ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ∈ Cℋ ) | |
| 31 | 25 30 | sylan | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ∈ Cℋ ) |
| 32 | 29 31 | jca | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( ( 𝐴 ∩ 𝐶 ) ∈ Cℋ ∧ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ∈ Cℋ ) ) |
| 33 | chj4 | ⊢ ( ( ( ( 𝐴 ∩ 𝐵 ) ∈ Cℋ ∧ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∈ Cℋ ) ∧ ( ( 𝐴 ∩ 𝐶 ) ∈ Cℋ ∧ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ∈ Cℋ ) ) → ( ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ) ∨ℋ ( ( 𝐴 ∩ 𝐶 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) = ( ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐶 ) ) ∨ℋ ( ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) ) | |
| 34 | 28 32 33 | syl2an | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) ∧ ( 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ) → ( ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ) ∨ℋ ( ( 𝐴 ∩ 𝐶 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) = ( ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐶 ) ) ∨ℋ ( ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) ) |
| 35 | 34 | 3impdi | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ) ∨ℋ ( ( 𝐴 ∩ 𝐶 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) = ( ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐶 ) ) ∨ℋ ( ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) ) |
| 36 | 35 | adantr | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → ( ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ) ∨ℋ ( ( 𝐴 ∩ 𝐶 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) = ( ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐶 ) ) ∨ℋ ( ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) ) |
| 37 | fh1 | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → ( 𝐴 ∩ ( 𝐵 ∨ℋ 𝐶 ) ) = ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐶 ) ) ) | |
| 38 | incom | ⊢ ( 𝐴 ∩ ( 𝐵 ∨ℋ 𝐶 ) ) = ( ( 𝐵 ∨ℋ 𝐶 ) ∩ 𝐴 ) | |
| 39 | 37 38 | eqtr3di | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐶 ) ) = ( ( 𝐵 ∨ℋ 𝐶 ) ∩ 𝐴 ) ) |
| 40 | 25 | 3anim1i | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( ( ⊥ ‘ 𝐴 ) ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ) |
| 41 | 40 | adantr | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → ( ( ⊥ ‘ 𝐴 ) ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ) |
| 42 | cmcm3 | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → ( 𝐴 𝐶ℋ 𝐵 ↔ ( ⊥ ‘ 𝐴 ) 𝐶ℋ 𝐵 ) ) | |
| 43 | 42 | 3adant3 | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( 𝐴 𝐶ℋ 𝐵 ↔ ( ⊥ ‘ 𝐴 ) 𝐶ℋ 𝐵 ) ) |
| 44 | cmcm3 | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( 𝐴 𝐶ℋ 𝐶 ↔ ( ⊥ ‘ 𝐴 ) 𝐶ℋ 𝐶 ) ) | |
| 45 | 44 | 3adant2 | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( 𝐴 𝐶ℋ 𝐶 ↔ ( ⊥ ‘ 𝐴 ) 𝐶ℋ 𝐶 ) ) |
| 46 | 43 45 | anbi12d | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ↔ ( ( ⊥ ‘ 𝐴 ) 𝐶ℋ 𝐵 ∧ ( ⊥ ‘ 𝐴 ) 𝐶ℋ 𝐶 ) ) ) |
| 47 | 46 | biimpa | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → ( ( ⊥ ‘ 𝐴 ) 𝐶ℋ 𝐵 ∧ ( ⊥ ‘ 𝐴 ) 𝐶ℋ 𝐶 ) ) |
| 48 | fh1 | ⊢ ( ( ( ( ⊥ ‘ 𝐴 ) ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( ( ⊥ ‘ 𝐴 ) 𝐶ℋ 𝐵 ∧ ( ⊥ ‘ 𝐴 ) 𝐶ℋ 𝐶 ) ) → ( ( ⊥ ‘ 𝐴 ) ∩ ( 𝐵 ∨ℋ 𝐶 ) ) = ( ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) | |
| 49 | 41 47 48 | syl2anc | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → ( ( ⊥ ‘ 𝐴 ) ∩ ( 𝐵 ∨ℋ 𝐶 ) ) = ( ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) |
| 50 | incom | ⊢ ( ( ⊥ ‘ 𝐴 ) ∩ ( 𝐵 ∨ℋ 𝐶 ) ) = ( ( 𝐵 ∨ℋ 𝐶 ) ∩ ( ⊥ ‘ 𝐴 ) ) | |
| 51 | 49 50 | eqtr3di | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → ( ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) = ( ( 𝐵 ∨ℋ 𝐶 ) ∩ ( ⊥ ‘ 𝐴 ) ) ) |
| 52 | 39 51 | oveq12d | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → ( ( ( 𝐴 ∩ 𝐵 ) ∨ℋ ( 𝐴 ∩ 𝐶 ) ) ∨ℋ ( ( ( ⊥ ‘ 𝐴 ) ∩ 𝐵 ) ∨ℋ ( ( ⊥ ‘ 𝐴 ) ∩ 𝐶 ) ) ) = ( ( ( 𝐵 ∨ℋ 𝐶 ) ∩ 𝐴 ) ∨ℋ ( ( 𝐵 ∨ℋ 𝐶 ) ∩ ( ⊥ ‘ 𝐴 ) ) ) ) |
| 53 | 23 36 52 | 3eqtrd | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → ( 𝐵 ∨ℋ 𝐶 ) = ( ( ( 𝐵 ∨ℋ 𝐶 ) ∩ 𝐴 ) ∨ℋ ( ( 𝐵 ∨ℋ 𝐶 ) ∩ ( ⊥ ‘ 𝐴 ) ) ) ) |
| 54 | 53 | ex | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) → ( 𝐵 ∨ℋ 𝐶 ) = ( ( ( 𝐵 ∨ℋ 𝐶 ) ∩ 𝐴 ) ∨ℋ ( ( 𝐵 ∨ℋ 𝐶 ) ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) |
| 55 | chjcl | ⊢ ( ( 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( 𝐵 ∨ℋ 𝐶 ) ∈ Cℋ ) | |
| 56 | cmcm | ⊢ ( ( 𝐴 ∈ Cℋ ∧ ( 𝐵 ∨ℋ 𝐶 ) ∈ Cℋ ) → ( 𝐴 𝐶ℋ ( 𝐵 ∨ℋ 𝐶 ) ↔ ( 𝐵 ∨ℋ 𝐶 ) 𝐶ℋ 𝐴 ) ) | |
| 57 | cmbr | ⊢ ( ( ( 𝐵 ∨ℋ 𝐶 ) ∈ Cℋ ∧ 𝐴 ∈ Cℋ ) → ( ( 𝐵 ∨ℋ 𝐶 ) 𝐶ℋ 𝐴 ↔ ( 𝐵 ∨ℋ 𝐶 ) = ( ( ( 𝐵 ∨ℋ 𝐶 ) ∩ 𝐴 ) ∨ℋ ( ( 𝐵 ∨ℋ 𝐶 ) ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) | |
| 58 | 57 | ancoms | ⊢ ( ( 𝐴 ∈ Cℋ ∧ ( 𝐵 ∨ℋ 𝐶 ) ∈ Cℋ ) → ( ( 𝐵 ∨ℋ 𝐶 ) 𝐶ℋ 𝐴 ↔ ( 𝐵 ∨ℋ 𝐶 ) = ( ( ( 𝐵 ∨ℋ 𝐶 ) ∩ 𝐴 ) ∨ℋ ( ( 𝐵 ∨ℋ 𝐶 ) ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) |
| 59 | 56 58 | bitrd | ⊢ ( ( 𝐴 ∈ Cℋ ∧ ( 𝐵 ∨ℋ 𝐶 ) ∈ Cℋ ) → ( 𝐴 𝐶ℋ ( 𝐵 ∨ℋ 𝐶 ) ↔ ( 𝐵 ∨ℋ 𝐶 ) = ( ( ( 𝐵 ∨ℋ 𝐶 ) ∩ 𝐴 ) ∨ℋ ( ( 𝐵 ∨ℋ 𝐶 ) ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) |
| 60 | 55 59 | sylan2 | ⊢ ( ( 𝐴 ∈ Cℋ ∧ ( 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ) → ( 𝐴 𝐶ℋ ( 𝐵 ∨ℋ 𝐶 ) ↔ ( 𝐵 ∨ℋ 𝐶 ) = ( ( ( 𝐵 ∨ℋ 𝐶 ) ∩ 𝐴 ) ∨ℋ ( ( 𝐵 ∨ℋ 𝐶 ) ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) |
| 61 | 60 | 3impb | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( 𝐴 𝐶ℋ ( 𝐵 ∨ℋ 𝐶 ) ↔ ( 𝐵 ∨ℋ 𝐶 ) = ( ( ( 𝐵 ∨ℋ 𝐶 ) ∩ 𝐴 ) ∨ℋ ( ( 𝐵 ∨ℋ 𝐶 ) ∩ ( ⊥ ‘ 𝐴 ) ) ) ) ) |
| 62 | 54 61 | sylibrd | ⊢ ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → ( ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) → 𝐴 𝐶ℋ ( 𝐵 ∨ℋ 𝐶 ) ) ) |
| 63 | 62 | imp | ⊢ ( ( ( 𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ ( 𝐴 𝐶ℋ 𝐵 ∧ 𝐴 𝐶ℋ 𝐶 ) ) → 𝐴 𝐶ℋ ( 𝐵 ∨ℋ 𝐶 ) ) |