| Step | Hyp | Ref | Expression | 
						
							| 1 |  | cdlemg8.l | ⊢  ≤   =  ( le ‘ 𝐾 ) | 
						
							| 2 |  | cdlemg8.j | ⊢  ∨   =  ( join ‘ 𝐾 ) | 
						
							| 3 |  | cdlemg8.m | ⊢  ∧   =  ( meet ‘ 𝐾 ) | 
						
							| 4 |  | cdlemg8.a | ⊢ 𝐴  =  ( Atoms ‘ 𝐾 ) | 
						
							| 5 |  | cdlemg8.h | ⊢ 𝐻  =  ( LHyp ‘ 𝐾 ) | 
						
							| 6 |  | cdlemg8.t | ⊢ 𝑇  =  ( ( LTrn ‘ 𝐾 ) ‘ 𝑊 ) | 
						
							| 7 |  | eqid | ⊢ ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 )  =  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) | 
						
							| 8 | 1 2 3 4 5 6 7 | cdlemg9a | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  ( ( 𝑃  ∨  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) )  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) ) )  ≤  ( ( 𝐺 ‘ 𝑃 )  ∨  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) ) ) | 
						
							| 9 |  | simp1l | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  𝐾  ∈  HL ) | 
						
							| 10 |  | simp1r | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  𝑊  ∈  𝐻 ) | 
						
							| 11 |  | simp21 | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 ) ) | 
						
							| 12 |  | simp22l | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  𝑄  ∈  𝐴 ) | 
						
							| 13 | 1 2 3 4 5 7 | cdlemg3a | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  𝑄  ∈  𝐴 )  →  ( 𝑃  ∨  𝑄 )  =  ( 𝑃  ∨  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) ) ) | 
						
							| 14 | 9 10 11 12 13 | syl211anc | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑃  ∨  𝑄 )  =  ( 𝑃  ∨  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) ) ) | 
						
							| 15 |  | simp1 | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 ) ) | 
						
							| 16 |  | simp22 | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 ) ) | 
						
							| 17 |  | simp23 | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  𝐹  ∈  𝑇 ) | 
						
							| 18 |  | simp31 | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  𝐺  ∈  𝑇 ) | 
						
							| 19 | 5 6 1 2 4 3 7 | cdlemg2l | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 ) )  ∧  ( 𝐹  ∈  𝑇  ∧  𝐺  ∈  𝑇 ) )  →  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  =  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) ) ) | 
						
							| 20 | 15 11 16 17 18 19 | syl122anc | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  =  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) ) ) | 
						
							| 21 | 14 20 | oveq12d | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  ( ( 𝑃  ∨  𝑄 )  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) ) )  =  ( ( 𝑃  ∨  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) )  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) ) ) ) | 
						
							| 22 | 5 6 1 2 4 3 7 | cdlemg2k | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 ) )  ∧  𝐺  ∈  𝑇 )  →  ( ( 𝐺 ‘ 𝑃 )  ∨  ( 𝐺 ‘ 𝑄 ) )  =  ( ( 𝐺 ‘ 𝑃 )  ∨  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) ) ) | 
						
							| 23 | 15 11 16 18 22 | syl121anc | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  ( ( 𝐺 ‘ 𝑃 )  ∨  ( 𝐺 ‘ 𝑄 ) )  =  ( ( 𝐺 ‘ 𝑃 )  ∨  ( ( 𝑃  ∨  𝑄 )  ∧  𝑊 ) ) ) | 
						
							| 24 | 8 21 23 | 3brtr4d | ⊢ ( ( ( 𝐾  ∈  HL  ∧  𝑊  ∈  𝐻 )  ∧  ( ( 𝑃  ∈  𝐴  ∧  ¬  𝑃  ≤  𝑊 )  ∧  ( 𝑄  ∈  𝐴  ∧  ¬  𝑄  ≤  𝑊 )  ∧  𝐹  ∈  𝑇 )  ∧  ( 𝐺  ∈  𝑇  ∧  𝑃  ≠  𝑄  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) )  ≠  ( 𝑃  ∨  𝑄 ) ) )  →  ( ( 𝑃  ∨  𝑄 )  ∧  ( ( 𝐹 ‘ ( 𝐺 ‘ 𝑃 ) )  ∨  ( 𝐹 ‘ ( 𝐺 ‘ 𝑄 ) ) ) )  ≤  ( ( 𝐺 ‘ 𝑃 )  ∨  ( 𝐺 ‘ 𝑄 ) ) ) |